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Alignment and Scaling of Large-Scale Fluctuations in the Solar Wind

Physical Review Letters 2013年第2期110卷 025003-025003页

作者： R. T. Wicks A. Mallet T. S. Horbury C. H. K. Chen A. A. Schekochihin J. J. Mitchell NASA Postdoctoral Program Fellow Goddard Space Flight Center Greenbelt Maryland 20771 USA Rudolf Peierls Centre for Theoretical Physics University of Oxford Oxford OX1 3NP United Kingdom Space and Atmospheric Physics Group Imperial College London London SW7 2AZ United Kingdom Space Sciences Laboratory University of California Berkeley California 94720 USA

We investigate the dependence of solar wind fluctuations measured by the Wind spacecraft on scale and on the degree of alignment between oppositely directed Elsasser fields. This alignment controls the strength of the nonlinear interactions and, therefore, the turbulence. We find that at scales larger than the outer scale of the turbulence the Elsasser fluctuations become on average more antialigned as the outer scale is approached from above. Conditioning structure functions using the alignment angle reveals turbulent scaling of unaligned fluctuations at scales previously believed to lie outside the turbulent cascade in the “1/f range.” We argue that the 1/f range contains a mixture of a noninteracting antialigned population of Alfvén waves and magnetic force-free structures plus a subdominant population of unaligned cascading turbulent fluctuations.

关键词： SOLAR wind RESEARCH SPACE vehicles ATMOSPHERIC turbulence CROSS section fluctuations (Nuclear physics) MAGNETOHYDRODYNAMIC waves

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ERRATUM: 'WISE DETECTIONS OF KNOWN QSOs AT REDSHIFTS GREATER THAN SIX' (2013, ApJ, 778, 113)

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The Astrophysical Journal 2014年第1期782卷

作者： Andrew W. Blain Roberto Assef Daniel Stern Chao-Wei Tsai Peter Eisenhardt Carrie Bridge Dominic Benford Tom Jarrett Roc Cutri Sara Petty Jingwen Wu Edward L. Wright Physics & Astronomy University of Leicester 1 University Road Leicester LE1 7RH UK Jet Propulsion Laboratory California Institute of Technology Pasadena CA 91109 USA Núcleo de Astronomía de la Facultad de Ingeniería Universidad Diego Portales Av. Ejército 441 Santiago Chile NASA Postdoctoral Program (NPP). California Institute of Technology 249-17 Pasadena CA 91125 USA Goddard Space Flight Center Greenbelt MD 20771 USA Astronomy Department University of Cape Town South Africa Infrared Processing and Analysis Center California Institute of Technology MS100-22 Pasadena CA 91125 USA Virginia Tech Department of Physics MC 0435 910 Drillfield Drive Blacksburg VA 24061 USA Division of Astronomy & Astrophysics University of California Los Angeles Physics and Astronomy Building 430 Portola Plaza Los Angeles CA 90095-1547 USA

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ERRATUM: 'THE SECOND CATALOG OF ACTIVE GALACTIC NUCLEI DETECTED BY THE FERMI LARGE AREA TELESCOPE' (2011, ApJ, 743, 171)

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The Astrophysical Journal 2015年第1期806卷

作者： M. Ackermann M. Ajello A. Allafort E. Antolini W. B. Atwood M. Axelsson L. Baldini J. Ballet G. Barbiellini D. Bastieri K. Bechtol R. Bellazzini B. Berenji R. D. Blandford E. D. Bloom E. Bonamente A. W. Borgland E. Bottacini A. Bouvier J. Bregeon M. Brigida P. Bruel R. Buehler T. H. Burnett S. Buson G. A. Caliandro R. A. Cameron P. A. Caraveo J. M. Casandjian E. Cavazzuti C. Cecchi E. Charles C. C. Cheung J. Chiang S. Ciprini R. Claus J. Cohen-Tanugi J. Conrad L. Costamante S. Cutini A. de Angelis F. de Palma C. D. Dermer S. W. Digel E. do Couto e Silva P. S. Drell R. Dubois L. Escande C. Favuzzi S. J. Fegan E. C. Ferrara J. Finke W. B. Focke P. Fortin M. Frailis Y. Fukazawa S. Funk P. Fusco F. Gargano D. Gasparrini N. Gehrels S. Germani B. Giebels N. Giglietto P. Giommi F. Giordano M. Giroletti T. Glanzman G. Godfrey I. A. Grenier J. E. Grove S. Guiriec M. Gustafsson D. Hadasch M. Hayashida E. Hays S. E. Healey D. Horan X. Hou R. E. Hughes G. Iafrate G. Jóhannesson A. S. Johnson W. N. Johnson T. Kamae H. Katagiri J. Kataoka J. Knödlseder M. Kuss J. Lande S. Larsson L. Latronico F. Longo F. Loparco B. Lott M. N. Lovellette P. Lubrano G. M. Madejski M. N. Mazziotta W. McConville J. E. McEnery P. F. Michelson W. Mitthumsiri T. Mizuno A. A. Moiseev C. Monte M. E. Monzani E. Moretti A. Morselli I. V. Moskalenko S. Murgia T. Nakamori M. Naumann-Godo P. L. Nolan J. P. Norris E. Nuss M. Ohno T. Ohsugi A. Okumura N. Omodei M. Orienti E. Orlando J. F. Ormes M. Ozaki D. Paneque D. Parent M. Pesce- Rollins M. Pierbattista S. Piranomonte F. Piron G. Pivato T. A. Porter S. Rainò R. Rando M. Razzano S. Razzaque A. Reimer O. Reimer S. Ritz L. S. Rochester R. W. Romani M. Roth D. A. Sanchez C. Sbarra J. D. Scargle T. L. Schalk C. SGRO M. S. Shaw E. J. Siskind G. Spandre P. Spinelli A. W. Strong D. J. Suson H. Tajima H. Takahashi T. Takahashi T. Tanaka J. G. Thayer J. B. Thayer D. J. Thompson L. Tibaldo M. Tinivella D. F. Torres G. Tosti E. Troja Y. Uchiyama J. Vandenbroucke V. Vasileiou G. Vianello V. Vitale A. P. Waite E. Walla W. W. Hansen Experimental Physics Laboratory Kavli Institute for Particle Astrophysics and Cosmology Department of Physics and SLAC National Accelerator Laboratory Stanford University Stanford CA 94305 USA Istituto Nazionale di Fisica Nucleare Sezione di Perugia I-06123 Perugia Italy Dipartimento di Fisica Università degli Studi di Perugia I-06123 Perugia Italy Santa Cruz Institute for Particle Physics Department of Physics and Department of Astronomy and Astrophysics University of California at Santa Cruz Santa Cruz CA 95064 USA Department of Astronomy Stockholm University SE-106 91 Stockholm Sweden The Oskar Klein Centre for Cosmoparticle Physics AlbaNova SE-106 91 Stockholm Sweden Department of Physics Royal Institute of Technology (KTH) AlbaNova SE-106 91 Stockholm Sweden Istituto Nazionale di Fisica Nucleare Sezione di Pisa I-56127 Pisa Italy Laboratoire AIM CEA-IRFU/CNRS/Université Paris Diderot Service d'Astrophysique CEA Saclay 91191 Gif sur Yvette France Istituto Nazionale di Fisica Nucleare Sezione di Trieste I-34127 Trieste Italy Dipartimento di Fisica Università di Trieste I-34127 Trieste Italy Istituto Nazionale di Fisica Nucleare Sezione di Padova I-35131 Padova Italy Dipartimento di Fisica 'G. Galilei' Università di Padova I-35131 Padova Italy Dipartimento di Fisica 'M. Merlin' dell'Università e del Politecnico di Bari I-70126 Bari Italy Istituto Nazionale di Fisica Nucleare Sezione di Bari 70126 Bari Italy Laboratoire Leprince-Ringuet École polytechnique CNRS/IN2P3 Palaiseau France Department of Physics University of Washington Seattle WA 98195-1560 USA Institut de Ciències de l'Espai (IEEE-CSIC) Campus UAB 08193 Barcelona Spain INAF-Istituto di Astrofisica Spaziale e Fisica Cosmica I-20133 Milano Italy Agenzia Spaziale Italiana (ASI) Science Data Center I-00044 Frascati (Roma) Italy National Research Council Research Associate National Academy of Sciences Washington DC 20001 USA ASI Science Data Center I-00044 Frascati (Roma)

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Dark matter constraints from observations of 25 Milky Way satellite galaxies with the Fermi Large Area Telescope

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Physical Review D 2014年第4期89卷 042001-042001页

作者： M. Ackermann A. Albert B. Anderson L. Baldini J. Ballet G. Barbiellini D. Bastieri K. Bechtol R. Bellazzini E. Bissaldi E. D. Bloom E. Bonamente A. Bouvier T. J. Brandt J. Bregeon M. Brigida P. Bruel R. Buehler S. Buson G. A. Caliandro R. A. Cameron M. Caragiulo P. A. Caraveo C. Cecchi E. Charles A. Chekhtman J. Chiang S. Ciprini R. Claus J. Cohen-Tanugi J. Conrad F. D’Ammando A. de Angelis C. D. Dermer S. W. Digel E. do Couto e Silva P. S. Drell A. Drlica-Wagner R. Essig C. Favuzzi E. C. Ferrara A. Franckowiak Y. Fukazawa S. Funk P. Fusco F. Gargano D. Gasparrini N. Giglietto M. Giroletti G. Godfrey G. A. Gomez-Vargas I. A. Grenier S. Guiriec M. Gustafsson M. Hayashida E. Hays J. Hewitt R. E. Hughes T. Jogler T. Kamae J. Knödlseder D. Kocevski M. Kuss S. Larsson L. Latronico M. Llena Garde F. Longo F. Loparco M. N. Lovellette P. Lubrano G. Martinez M. Mayer M. N. Mazziotta P. F. Michelson W. Mitthumsiri T. Mizuno A. A. Moiseev M. E. Monzani A. Morselli I. V. Moskalenko S. Murgia R. Nemmen E. Nuss T. Ohsugi E. Orlando J. F. Ormes J. S. Perkins F. Piron G. Pivato T. A. Porter S. Rainò R. Rando M. Razzano S. Razzaque A. Reimer O. Reimer S. Ritz M. Sánchez-Conde N. Sehgal C. Sgrò E. J. Siskind P. Spinelli L. Strigari D. J. Suson H. Tajima H. Takahashi J. B. Thayer L. Tibaldo M. Tinivella D. F. Torres Y. Uchiyama T. L. Usher J. Vandenbroucke G. Vianello V. Vitale M. Werner B. L. Winer K. S. Wood M. Wood G. Zaharijas S. Zimmer Deutsches Elektronen Synchrotron DESY D-15738 Zeuthen Germany W. W. Hansen Experimental Physics Laboratory Kavli Institute for Particle Astrophysics and Cosmology Department of Physics and SLAC National Accelerator Laboratory Stanford University Stanford California 94305 USA Department of Physics Stockholm University AlbaNova SE-106 91 Stockholm Sweden The Oskar Klein Centre for Cosmoparticle Physics AlbaNova SE-106 91 Stockholm Sweden Università di Pisa and Istituto Nazionale di Fisica Nucleare Sezione di Pisa I-56127 Pisa Italy Laboratoire AIM CEA-IRFU/CNRS/Université Paris Diderot Service d’Astrophysique CEA Saclay 91191 Gif sur Yvette France Istituto Nazionale di Fisica Nucleare Sezione di Trieste I-34127 Trieste Italy Dipartimento di Fisica Università di Trieste I-34127 Trieste Italy Istituto Nazionale di Fisica Nucleare Sezione di Padova I-35131 Padova Italy Dipartimento di Fisica e Astronomia “G. Galilei ” Università di Padova I-35131 Padova Italy Istituto Nazionale di Fisica Nucleare Sezione di Pisa I-56127 Pisa Italy Istituto Nazionale di Fisica Nucleare Sezione di Trieste and Università di Trieste I-34127 Trieste Italy Istituto Nazionale di Fisica Nucleare Sezione di Perugia I-06123 Perugia Italy Dipartimento di Fisica Università degli Studi di Perugia I-06123 Perugia Italy Santa Cruz Institute for Particle Physics Department of Physics and Department of Astronomy and Astrophysics University of California at Santa Cruz Santa Cruz California 95064 USA NASA Goddard Space Flight Center Greenbelt Maryland 20771 USA Dipartimento di Fisica “M. Merlin” dell’Università e del Politecnico di Bari I-70126 Bari Italy Istituto Nazionale di Fisica Nucleare Sezione di Bari 70126 Bari Italy Laboratoire Leprince-Ringuet École polytechnique CNRS/IN2P3 Palaiseau France INAF-Istituto di Astrofisica Spaziale e Fisica Cosmica I-20133 Milano Italy Center for Earth Observing and Space Research College of Science George Mason University Fairfax Virginia 22030

The dwarf spheroidal satellite galaxies of the Milky Way are some of the most dark-matter-dominated objects known. Due to their proximity, high dark matter content, and lack of astrophysical backgrounds, dwarf spheroidal galaxies are widely considered to be among the most promising targets for the indirect detection of dark matter via γ rays. Here we report on γ-ray observations of 25 Milky Way dwarf spheroidal satellite galaxies based on 4 years of Fermi Large Area Telescope (LAT) data. None of the dwarf galaxies are significantly detected in γ rays, and we present γ-ray flux upper limits between 500 MeV and 500 GeV. We determine the dark matter content of 18 dwarf spheroidal galaxies from stellar kinematic data and combine LAT observations of 15 dwarf galaxies to constrain the dark matter annihilation cross section. We set some of the tightest constraints to date on the annihilation of dark matter particles with masses between 2 GeV and 10 TeV into prototypical standard model channels. We find these results to be robust against systematic uncertainties in the LAT instrument performance, diffuse γ-ray background modeling, and assumed dark matter density profile.

关键词： DWARF galaxies MILKY Way DARK matter (Astronomy) ANNIHILATION reactions TELESCOPES

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Deuterated water in the solar-type protostars NGC 1333 IRAS 4A and IRAS 4B

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ASTRONOMY & ASTROphysics 2013年第1期560卷 1-16页

作者： Coutens, A. Vastel, C. Cabrit, S. Codella, C. Kristensen, L. E. Ceccarelli, C. van Dishoeck, E. F. Boogert, A. C. A. Bottinelli, S. Castets, A. Caux, E. Comito, C. Demyk, K. Herpin, F. Lefloch, B. McCoey, C. Mottram, J. C. Parise, B. Taquet, V. van der Tak, F. F. S. Visser, R. Yildiz, U. A. Université de Toulouse UPS-OMP IRAP Toulouse France CNRS IRAP 9 Av. Colonel Roche BP 44346 31028 Toulouse Cedex 4 France Niels Bohr Institute University of Copenhagen Juliane Maries Vej 30 2100 Copenhagen Ø. Denmark Centre for Star and Planet Formation Natural History Museum of Denmark University of Copenhagen Øster Voldgade 57 1350 Copenhagen K. Denmark LERMA Observatoire de Paris UMR 8112 CNRS/INSU 61 Av. de l''Observatoire 75014 Paris France INAF - Osservatorio Astrofisico di Arcetri Largo E. Fermi 5 50125 Firenze Italy Harvard-Smithsonian Center for Astrophysics 60 Garden Street Cambridge MA 02138 USA Institut de Planétologie et d''Astrophysique de Grenoble (IPAG) UMR 5274 UJF-Grenoble 1/CNRS 38041 Grenoble France Leiden Observatory Leiden University PO Box 9513 2300 RA Leiden The Netherlands Max-Planck-Institut für Extraterrestrische Physik Giessenbachtrasse 1 85748 Garching Germany California Institute of Technology Infrared Processing and Analysis Center Mail Code 100-22 Pasadena CA 91125 USA Physikalisches Institut Universität zu Köln Zülpicher Str. 77 50937 Köln Germany Max-Planck-Institut für Radioastronomie Auf dem Hügel 69 53121 Bonn Germany Université de Bordeaux Laboratoire d''Astrophysique de Bordeaux 33000 Bordeaux France CNRS/INSU UMR 5804 BP 89 33271 Floirac Cedex France University of Waterloo Department of Physics and Astronomy Waterloo Ontario Canada NASA Postdoctoral Program Fellow NASA Goddard Space Flight Center 8800 Greenbelt Road Greenbelt MD 20770 USA SRON Netherlands Institute for Space Research Landleven 12 9747 AD Groningen The Netherlands Kapteyn Astronomical Institute University of Groningen 9700 AV Groningen The Netherlands

Context. The measure of the water deuterium fractionation is a relevant tool for understanding mechanisms of water formation and evolution from the prestellar phase to the formation of planets and comets. Aims. The aim of this paper is to study deuterated water in the solar-type protostars NGC 1333 IRAS 4A and IRAS 4B, to compare their HOD abundance distributions with other star-forming regions, and to constrain their HDO/H2O abundance ratios. Methods. Using the Herschel/HIFI instrument as well as ground-based telescopes, we observed several HOD lines covering a large excitation range (E-ap/k = 22-168 K) towards these protostars and an outflow position. Non-local thermal equilibrium radiative transfer codes were then used to determine the HDO abundance profiles in these sources. Results. The HDO fundamental line profiles show a very broad component, tracing the molecular outflows, in addition to a narrower emission component and a narrow absorbing component. In the protostellar envelope of NGC 1333 IRAS 4A, the HOD inner (T >= 100 K) and outer (T < 100 K) abundances with respect to H-2 are estimated with a 3 sigma uncertainty at 7.5(-3.0)(+3.5) x 10(-9) and 1.2(-0.4)(+0.4) x 10(-11), respectively, whereas in NGC 1333 IRAS 4B they are x 10(-8) and 1.2(-0.4)(+0.6) x 10(-10), respectively. Similarly to the low-mass protostar IRAS 16293-2422, an absorbing outer layer with an enhanced abundance of deuterated water is required to reproduce the absorbing components seen in the fundamental lines at 465 and 894 GHz in both sources. This water-rich layer is probably extended enough to encompass the two sources, as well as parts of the outflows. In the outflows emanating from NGC 1333 IRAS 4A, the HDO column density is estimated at about (2-4) x 100 cm(-2), leading to an abundance of about (0.7-1.9) x 10(-9). An HDO/H2O ratio between 7 x 10(-4) and 9 x 10(-2) is also derived in the outflows. In the warm inner regions of these two sources, we estimate the HDO/H2O ratios at abou

关键词： astrochemistry ISM: individual objects: NGC 1333 IRAS 4A ISM: individual objects: NGC 1333 IRAS 4B ISM: abundances ISM: molecules

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Identifying the location in the host galaxy of short GRB 111117A with the chandra sub-arcsecond position

Identifying the location in the host galaxy of short GRB 111...

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2012 Gamma-Ray Bursts Conference, GRB 2012

作者： Sakamoto, T. Troja, E. Aoki, K. Guiriec, S. Im, M. Leloudas, G. Malesani, D. Melandri, A. De Ugarte Postigo, A. Urata, Y. Xu, D. CRESST and Astroparticle Physics laboratory NASA/GSFC GreenbeltMD20771 United States Joint Center for Astrophysics University of Maryland Baltimore County 1000 Hilltop Circle BaltimoreMD21250 United States NASA Postdoctoral Program Fellow Goddard Space Flight Center GreenbeltMD20771 United States Subaru Telescope National Astronomical Observatory of Japan 650 North A’ohoku Place HiloHI96720 United States Department of Physics and Astronomy Seoul National University Seoul151-747 Korea Republic of Oskar Klein Centre Department of Physics Stockholm University Stockholm106 91 Sweden Dark Cosmology Centre Niels Bohr Institute University of Copenhagen Juliane Maries Vej 30 Copenhagen Ø2100 Denmark I-23807 Italy Glorieta de la Astronomía s/n Granada18008 Spain Institute of Astornomy National Central University Chung-Li32054 Taiwan Department of Particle Physics and Astronomy Weizmann Institute of Science Rehovot76100 Israel

We present our successful program using Chandra for identifying the X-ray afterglow with sub-arcsecond accuracy for the short GRB 111117A discovered by Swift and Fermi. Thanks to our rapid target of opportunity request, Chandra clearly detected the X-ray afterglow, whereas no optical afterglow was found in deep optical observations. Instead, we clearly detect the host galaxy in optical and also in near-infrared bands. We found that the best fit photometric redshift of the host is z = 1.31+−004623 (90% confidence), making it one of the highest redshift short GRBs. Furthermore, we see an offset of 1.0 ± 0.2 arcseconds, which corresponds to 8.4 ± 1.7 kpc assuming z=1.31, between the host and the afterglow position. We discuss the importance of using Chandra for obtaining sub-arcsecond localization of the afterglow in X-rays for short GRBs to study GRB environments in great detail. © Copyright owned by the author(s) under the terms of the Creative Commons Attribution-NonCommercial-ShareAlike Licence.

关键词： Galaxies

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ERRATUM: 'FERMI LARGE AREA TELESCOPE STUDY OF COSMIC-RAYS AND THE INTERSTELLAR MEDIUM IN NEARBY MOLECULAR CLOUDS' (2012, ApJ, 755, 22)

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The Astrophysical Journal 2013年第1期778卷

作者： M. Ackermann M. Ajello A. Allafort L. Baldini J. Ballet G. Barbiellini D. Bastieri K. Bechtol R. Bellazzini B. Berenji R. D. Blandford E. D. Bloom E. Bonamente A. W. Borgland E. Bottacini T. J. Brandt J. Bregeon M. Brigida P. Bruel R. Buehler G. Busetto S. Buson G. A. Caliandro R. A. Cameron P. A. Caraveo J. M. Casandjian C. Cecchi E. Charles A. Chekhtman J. Chiang S. Ciprini R. Claus J. Cohen-Tanugi J. Conrad F. D'Ammando A. de Angelis F. de Palma C. D. Dermer S. W. Digel E. do Couto e Silva P. S. Drell A. Drlica-Wagner L. Falletti C. Favuzzi S. J. Fegan E. C. Ferrara W. B. Focke Y. Fukazawa Y. Fukui S. Funk P. Fusco F. Gargano D. Gasparrini S. Germani N. Giglietto F. Giordano M. Giroletti T. Glanzman G. Godfrey I. A. Grenier M.-H. Grondin J. E. Grove S. Guiriec D. Hadasch Y. Hanabata A. K. Harding K. Hayashi D. Horan X. Hou R. E. Hughes R. Itoh M. S. Jackson G. Jóhannesson A. S. Johnson T. Kamae H. Katagiri J. Kataoka J. Knödlseder M. Kuss J. Lande S. Larsson S.-H. Lee M. Lemoine-Goumard F. Longo F. Loparco M. N. Lovellette P. Lubrano P. Martin M. N. Mazziotta J. E. McEnery J. Mehault P. F. Michelson W. Mitthumsiri T. Mizuno A. A. Moiseev C. Monte M. E. Monzani A. Morselli I. V. Moskalenko S. Murgia M. Naumann-Godo R. Nemmen S. Nishino J. P. Norris E. Nuss M. Ohno T. Ohsugi A. Okumura N. Omodei E. Orlando J. F. Ormes M. Ozaki D. Paneque J. H. Panetta D. Parent M. Pesce-Rollins M. Pierbattista F. Piron G. Pivato T. A. Porter S. Rainò R. Rando M. Razzano A. Reimer O. Reimer C. Romoli M. Roth T. Sada H. F.-W. Sadrozinski D. A. Sanchez C. Sbarra C. Sgrò E. J. Siskind G. Spandre P. Spinelli A. W. Strong D. J. Suson H. Takahashi T. Takahashi T. Tanaka J. G. Thayer J. B. Thayer D. J. Thompson L. Tibaldo O. Tibolla M. Tinivella D. F. Torres G. Tosti A. Tramacere E. Troja Y. Uchiyama T. Uehara T. L. Usher J. Vandenbroucke V. Vasileiou G. Vianello V. Vitale A. P. Waite P. Wang B. L. Winer K. S. Wood H. Yamamoto Z. Yang S. Zimmer Deutsches Elektronen Synchrotron DESY D-15738 Zeuthen Germany W. W. Hansen Experimental Physics Laboratory Kavli Institute for Particle Astrophysics and Cosmology Department of Physics and SLAC National Accelerator Laboratory Stanford University Stanford CA 94305 USA Istituto Nazionale di Fisica Nucleare Sezione di Pisa I-56127 Pisa Italy Laboratoire AIM CEA-IRFU/CNRS/Université Paris Diderot Service d'Astrophysique CEA Saclay 91191 Gif sur Yvette France Istituto Nazionale di Fisica Nucleare Sezione di Trieste I-34127 Trieste Italy Dipartimento di Fisica Università di Trieste I-34127 Trieste Italy Istituto Nazionale di Fisica Nucleare Sezione di Padova I-35131 Padova Italy Dipartimento di Fisica 'G. Galilei ' Università di Padova I-35131 Padova Italy Istituto Nazionale di Fisica Nucleare Sezione di Perugia I-06123 Perugia Italy Dipartimento di Fisica Università degli Studi di Perugia I-06123 Perugia Italy CNRS IRAP F-31028 Toulouse cedex 4 France GAHEC Université de Toulouse UPS-OMP IRAP Toulouse France Dipartimento di Fisica 'M. Merlin' dell'Università e del Politecnico di Bari I-70126 Bari Italy Istituto Nazionale di Fisica Nucleare Sezione di Bari 70126 Bari Italy Laboratoire Leprince-Ringuet École polytechnique CNRS/IN2P3 Palaiseau France Institut de Ciències de l'Espai (IEEE-CSIC) Campus UAB 08193 Barcelona Spain INAF-Istituto di Astrofisica Spaziale e Fisica Cosmica I-20133 Milano Italy Center for Earth Observing and Space Research College of Science George Mason University Fairfax VA 22030 USA Resident at Naval Research Laboratory Washington DC 20375 USA. ASI Science Data Center I-00044 Frascati (Roma) Italy Laboratoire Univers et Particules de Montpellier Université Montpellier 2 CNRS/IN2P3 Montpellier France Department of Physics Stockholm University AlbaNova SE-106 91 Stockholm Sweden The Oskar Klein Centre for Cosmoparticle Physics AlbaNova SE-106 91 Stockholm Sweden Royal Swedish Academy of Sciences Research Fellow funded by

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Is there a mildly relativistic jet in SN2007gr?

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Proceedings of the International Astronomical Union 2011年第S275期6卷 319-320页

作者： Z. Paragi A. J. van der Horst M. Tanaka G. B. Taylor C. Kouveliotou J. Granot E. Ramirez-Ruiz Y. Pidopryhora S. Bourke R. M. Campbell Joint Institute for VLBI in Europe (JIVE) Dwingeloo the Netherlands NASA Postdoctoral Program Fellow NASA/MSFC/ORAU Huntsville AL USA Institute for the Physics and Mathemathics of the Universe Univ. Tokyo Kashiwa Japan University of New Mexico Albuquerque USA NASA/MSFC Huntsville AL USA University of Hertfordshire UK University of California Santa Cruz USA

SN2007gr was an ordinary type Ic supernova, with a hint of asymmetric explosion seen in the optical polarization spectrum. This type of SNe is occasionally associated with long duration gamma-ray bursts which generate ultra-relativistic jets; no relativistic outflows have yet been found by direct imaging in SNe Ib/c explosions. High resolution very long baseline interferometry (VLBI) data and simultaneous total radio flux density measurements indicated that SN2007gr has expanded mildly relativistically. We performed late time Westerbork Synthesis Radio Telescope (WSRT) observations to measure the level of the underlying extended emission. Comparison of the VLBI and the background-subtracted WSRT and independent VLA data indicate an at least partially resolved source with an average expansion velocity of ≥0.4c, although the VLBI data could be consistent with a fainter source with an expansion velocity of ~0.2c as well.

关键词： supernovae: general supernovae: individual (SN 2007gr) ISM: jets and outflows radio continuum: general techniques: interferometric

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Fermi LAT search for dark matter in gamma-ray lines and the inclusive photon spectrum

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Physical Review D 2012年第2期86卷 022002-022002页

作者： M. Ackermann M. Ajello A. Albert L. Baldini G. Barbiellini K. Bechtol R. Bellazzini B. Berenji R. D. Blandford E. D. Bloom E. Bonamente A. W. Borgland M. Brigida R. Buehler S. Buson G. A. Caliandro R. A. Cameron P. A. Caraveo J. M. Casandjian C. Cecchi E. Charles A. Chekhtman J. Chiang S. Ciprini R. Claus J. Cohen-Tanugi J. Conrad F. D’Ammando F. de Palma C. D. Dermer E. do Couto e Silva P. S. Drell A. Drlica-Wagner Y. Edmonds R. Essig C. Favuzzi S. J. Fegan W. B. Focke Y. Fukazawa S. Funk P. Fusco F. Gargano D. Gasparrini S. Germani N. Giglietto F. Giordano M. Giroletti T. Glanzman G. Godfrey I. A. Grenier S. Guiriec M. Gustafsson D. Hadasch M. Hayashida D. Horan R. E. Hughes T. Kamae J. Knödlseder M. Kuss J. Lande A. M. Lionetto M. Llena Garde F. Longo F. Loparco M. N. Lovellette P. Lubrano M. N. Mazziotta P. F. Michelson W. Mitthumsiri T. Mizuno A. A. Moiseev C. Monte M. E. Monzani A. Morselli I. V. Moskalenko S. Murgia M. Naumann-Godo J. P. Norris E. Nuss T. Ohsugi A. Okumura E. Orlando J. F. Ormes D. Paneque J. H. Panetta M. Pesce-Rollins F. Piron G. Pivato T. A. Porter D. Prokhorov S. Rainò R. Rando M. Razzano O. Reimer M. Roth C. Sbarra J. D. Scargle C. Sgrò E. J. Siskind A. Snyder P. Spinelli D. J. Suson H. Takahashi T. Tanaka J. G. Thayer J. B. Thayer L. Tibaldo M. Tinivella D. F. Torres G. Tosti E. Troja J. Vandenbroucke V. Vasileiou G. Vianello V. Vitale A. P. Waite B. L. Winer K. S. Wood Z. Yang S. Zimmer Deutsches Elektronen Synchrotron DESY D-15738 Zeuthen Germany W. W. Hansen Experimental Physics Laboratory Kavli Institute for Particle Astrophysics and Cosmology Department of Physics and SLAC National Accelerator Laboratory Stanford University Stanford California 94305 USA Department of Physics Center for Cosmology and Astro-Particle Physics The Ohio State University Columbus Ohio 43210 USA Istituto Nazionale di Fisica Nucleare Sezione di Pisa I-56127 Pisa Italy Istituto Nazionale di Fisica Nucleare Sezione di Trieste I-34127 Trieste Italy Dipartimento di Fisica Università di Trieste I-34127 Trieste Italy Istituto Nazionale di Fisica Nucleare Sezione di Perugia I-06123 Perugia Italy Dipartimento di Fisica Università degli Studi di Perugia I-06123 Perugia Italy Dipartimento di Fisica “M. Merlin” dell’Università e del Politecnico di Bari I-70126 Bari Italy Istituto Nazionale di Fisica Nucleare Sezione di Bari 70126 Bari Italy Istituto Nazionale di Fisica Nucleare Sezione di Padova I-35131 Padova Italy Dipartimento di Fisica “G. Galilei” Università di Padova I-35131 Padova Italy Institut de Ciències de l’Espai (IEEE-CSIC) Campus UAB 08193 Barcelona Spain INAF-Istituto di Astrofisica Spaziale e Fisica Cosmica I-20133 Milano Italy Laboratoire AIM CEA-IRFU/CNRS/Université Paris Diderot Service d’Astrophysique CEA Saclay 91191 Gif sur Yvette France Artep Inc. 2922 Excelsior Springs Court Ellicott City Maryland 21042 USAresident at Naval Research Laboratory Washington D.C. 20375 USA ASI Science Data Center I-00044 Frascati (Roma) Italy Laboratoire Univers et Particules de Montpellier Université Montpellier 2 CNRS/IN2P3 Montpellier France Department of Physics Stockholm University AlbaNova SE-106 91 Stockholm Sweden The Oskar Klein Centre for Cosmoparticle Physics AlbaNova SE-106 91 Stockholm Sweden IASF Palermo 90146 Palermo Italy INAF-Istituto di Astrofisica Spaziale e Fisica Cosmica I-00133 Roma Italy Space Science Division Naval Research Labor

Dark matter particle annihilation or decay can produce monochromatic gamma-ray lines and contribute to the diffuse gamma-ray background. Flux upper limits are presented for gamma-ray spectral lines from 7 to 200 GeV and for the diffuse gamma-ray background from 4.8 GeV to 264 GeV obtained from two years of Fermi Large Area Telescope data integrated over most of the sky. We give cross-section upper limits and decay lifetime lower limits for dark matter models that produce gamma-ray lines or contribute to the diffuse spectrum, including models proposed as explanations of the PAMELA and Fermi cosmic-ray data.

关键词： FERMI surfaces DARK matter (Astronomy) ANNIHILATION reactions RADIOACTIVE decay GAMMA ray spectrometry CROSS sections (Nuclear physics)

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Universality of short-range correlations in light nuclei

引用

Journal of physics: Conference Series 2011年第1期321卷

作者： W Horiuchi H Feldmeier T Neff Y Suzuki GSI Helmholtzzentrum für Schwerionenforschung GmbH Planckstraße 1 64291 Darmstadt Germany Present address: RIKEN Nishina Center RIKEN Wako 351-0198 Japan supported by the Special Postdoctoral Researchers Program of RIKEN RIKEN Nishina Center RIKEN Wako 351-0198 Japan Department of Physics Niigata University Niigata 950-2181 Japan

In this contribution, we investigate the structure of short-range correlations in many-body states. We obtain the highly correlated many-body states with an explicitly correlated basis which enables us to get a precise solution of a many-body Schrödinger equation for a realistic interaction. We show two-body density distributions calculated from three- and four-body states to investigate the short-range correlations between nucleon pairs. At distances below 1 fm a universal behavior is found which does not depend on the many-body states. The universality is also seen in the high momentum components of the two-body momentum distributions.

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