检索结果-内蒙古大学图书馆

The discovery of a rotating radio transient J1918−0449 with intriguing emission properties with the five hundred meter aperture spherical radio telescope

arXiv

引用

arXiv 2022年

作者： Chen, J.L. Wen, Zhigang Yuan, J.P. Wang, N. Li, D. Wang, H.G. Yan, W.M. Yuen, R. Wang, P. Wang, Z. Zhu, W.W. Niu, J.R. Miao, C.C. Xue, M.Y. Gong, B.P. Department of Physics and Electronic Engineering Yuncheng University Shanxi Yuncheng044000 China Xinjiang Astronomical Observatory Chinese Academy of Sciences 150 Science-1 Street Xinjiang Urumqi830011 China Key laboratory of Radio Astronomy Chinese Academy of Sciences Nanjing210008 China Key Laboratory of Microwave Technology Urumqi Xinjiang830011 China Guizhou Provincial Key Laboratory of Radio Astronomy and Data Processing Guizhou Guiyang550001 China National Astronomical Observatories Chinese Academy of Sciences Beijing100101 China NAOC-UKZN Computational Astrophysics Centre University of KwaZulu-Natal Durban4000 South Africa School of Physics and Electronic Engineering Guangzhou University Guangzhou510006 China School of Physical Science and Technology Xinjiang University Xinjiang Urumqi830046 China Department of Physics Huazhong University of Science and Technology Wuhan430074 China

In this study, we report on a detailed single pulse analysis of the radio emission from a rotating radio transient (RRAT) J1918−0449 which is the first RRAT discovered with the five hundred meter aperture spherical radio telescope (FAST). The sensitive observations were carried out on 30 April 2021 using the FAST with a central frequency of 1250 MHz and a short time resolution of 49.152 µs, which forms a reliable basis to probe single pulse emission properties in detail. The source was successively observed for around 2 hours. A total of 83 dispersed bursts with significance above 6σ are detected over 1.8 hours. The source’s DM and rotational period are determined to be 116.1±0.4 pc cm−3 and 2479.21±0.03 ms, respectively. The share of registered pulses from the total number of observed period is 3.12%. No underlying emission is detected in the averaged off pulse profile. For bursts with fluence larger than 10 Jy ms, the pulse energy follows a power-law distribution with an index of −3.1 ± 0.4, suggesting the existence of bright pulse emission. We find that the distribution of time between subsequent pulses is consistent with a stationary Poisson process and find no evidence of clustering over the 1.8 h observations, giving a mean burst rate of one burst every 66 s. Close inspection of the detected bright pulses reveals that 21 pulses exhibit well-defined quasi-periodicities. The subpulse drifting is present in non-successive rotations with periodicity of 2.51 ± 0.06 periods. Finally, possible physical mechanisms are discussed. © 2022, CC BY.

关键词： Poisson distribution

来源：评论

学校读者我要写书评

暂无评论

Morphology engineering of atomic layer defect-rich CoSe2 nanosheets for highly selective electrosynthesis of hydrogen peroxide

引用

Journal of Materials Chemistry A 2021年第37期9卷 21340-21346页

作者： Yuan Ji Yundan Liu Bin-Wei Zhang Zhongfei Xu Xiang Qi Xun Xu Long Ren Yi Du Jianxin Zhong Shi Xue Dou Hunan Key Laboratory of Micro-Nano Energy Materials and Devices Laboratory for Quantum Engineering and Micro-Nano Energy Technology and Faculty of Materials and Optoelectronic Physics Xiangtan University Hunan 411105 P. R. China Institute for Superconducting and Electronic Materials (ISEM) University of Wollongong Wollongong NSW 2500 Australia Beijing Computational Science Research Center Beijing China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing and International School of Materials Science and Engineering Wuhan University of Technology Wuhan 430070 China BUAA-UOW Joint Research Centre and School of Physics Beihang University Beijing China

Hydrogen peroxide (H2O2) is widely used as a green oxidant for varying applications. Electrosynthesis is an economical and environmentally-friendly strategy to directly produce H2O2. Its practical production is hinder...

Hydrogen peroxide (H₂O₂) is widely used as a green oxidant for varying applications. Electrosynthesis is an economical and environmentally-friendly strategy to directly produce H₂O₂. Its practical production is hindered, however, by the lack of highly efficient and selective as well as low-cost electrocatalysts. Transition metal chalcogenide materials have been proved to be good catalysts for the oxygen evolution reaction, but their selectivity towards conversion of O₂ to H₂O₂ remains unsatisfactory. In this work, 3 atomic-layer defect-rich CoSe₂ nanosheets have been successfully grown on carbon cloth as a high performance electrocatalyst. The morphology of CoSe₂ can be tuned by regulating the wettability of the growth substrate. The atomic-layer CoSe₂ nanosheets showed unprecedented 92% selectivity towards H₂O₂ production in alkaline solutions, and the yields of H₂O₂ in alkaline and acidic solutions were 1227.7 mg L⁻¹ h⁻¹ and 894 mg L⁻¹ h⁻¹, respectively. The high efficiency and selectivity originate from the rich defects in the atomic-layer CoSe₂ nanosheets, which can accelerate the adsorption of OOH by the exposed Co defect sites.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Measurement of the 2νββ Decay Rate and Spectral Shape of Mo100 from the CUPID-Mo Experiment

引用

Physical Review Letters 2023年第16期131卷 162501-162501页

作者： C. Augier A. S. Barabash F. Bellini G. Benato M. Beretta L. Bergé J. Billard Yu. A. Borovlev L. Cardani N. Casali A. Cazes E. Celi M. Chapellier D. Chiesa I. Dafinei F. A. Danevich M. De Jesus T. Dixon L. Dumoulin K. Eitel F. Ferri B. K. Fujikawa J. Gascon L. Gironi A. Giuliani V. D. Grigorieva M. Gros D. L. Helis H. Z. Huang R. Huang L. Imbert J. Johnston A. Juillard H. Khalife M. Kleifges V. V. Kobychev Yu. G. Kolomensky S. I. Konovalov J. Kotila P. Loaiza L. Ma E. P. Makarov P. de Marcillac R. Mariam L. Marini S. Marnieros X.-F. Navick C. Nones E. B. Norman E. Olivieri J. L. Ouellet L. Pagnanini L. Pattavina B. Paul M. Pavan H. Peng G. Pessina S. Pirro D. V. Poda O. G. Polischuk S. Pozzi E. Previtali Th. Redon A. Rojas S. Rozov V. Sanglard J. A. Scarpaci B. Schmidt Y. Shen V. N. Shlegel F. Šimkovic V. Singh C. Tomei V. I. Tretyak V. I. Umatov L. Vagneron M. Velázquez B. Ware B. Welliver L. Winslow M. Xue E. Yakushev M. Zarytskyy A. S. Zolotarova Univ Lyon Université Lyon 1 CNRS/IN2P3 IP2I-Lyon F-69622 Villeurbanne France National Research Centre “Kurchatov Institute ” Kurchatov Complex of Theoretical and Experimental Physics 117218 Moscow Russia Dipartimento di Fisica Sapienza Università di Roma Piazzale Aldo Moro 2 I-00185 Rome Italy INFN Sezione di Roma P.le Aldo Moro 2 I-00185 Rome Italy INFN Laboratori Nazionali del Gran Sasso I-67100 Assergi (AQ) Italy INFN Gran Sasso Science Institute I-67100 L’Aquila Italy University of California Berkeley California 94720 USA Université Paris-Saclay CNRS/IN2P3 IJCLab 91405 Orsay France Nikolaev Institute of Inorganic Chemistry 630090 Novosibirsk Russia Dipartimento di Fisica Università di Milano-Bicocca I-20126 Milano Italy INFN Sezione di Milano-Bicocca I-20126 Milano Italy Institute for Nuclear Research of NASU 03028 Kyiv Ukraine INFN Sezione di Roma Tor Vergata Via della Ricerca Scientifica 1 I-00133 Rome Italy IRFU CEA Université Paris-Saclay F-91191 Gif-sur-Yvette France Karlsruhe Institute of Technology Institute for Astroparticle Physics 76021 Karlsruhe Germany Lawrence Berkeley National Laboratory Berkeley California 94720 USA Key Laboratory of Nuclear Physics and Ion-beam Application (MOE) Fudan University Shanghai 200433 People’s Republic of China Massachusetts Institute of Technology Cambridge Massachusetts 02139 USA Karlsruhe Institute of Technology Institute for Data Processing and Electronics 76021 Karlsruhe Germany National Research Centre Kurchatov Institute Institute of Theoretical and Experimental Physics 117218 Moscow Russia Department of Physics University of Jyväskylä P.O. Box 35 FI-40014 Jyväskylä Finland Finnish Institute for Educational Research University of Jyväskylä P.O. Box 35 FI-40014 Jyvaäskylä Finland Center for Theoretical Physics Sloane Physics Laboratory Yale University New Haven Connecticut 06520-8120 USA Physik Department Technische Universität München Garching D-85748 Germany Department of Modern P

Neutrinoless double beta decay (0νββ) is a yet unobserved nuclear process that would demonstrate Lepton number violation, a clear evidence of beyond standard model physics. The process two neutrino double beta decay (2νββ) is allowed by the standard model and has been measured in numerous experiments. In this Letter, we report a measurement of 2νββ decay half-life of Mo100 to the ground state of Ru100 of [7.07±0.02(stat)±0.11(syst)]×1018 yr by the CUPID-Mo experiment. With a relative precision of ±1.6% this is the most precise measurement to date of a 2νββ decay rate in Mo100. In addition, we constrain higher-order corrections to the spectral shape, which provides complementary nuclear structure information. We report a novel measurement of the shape factor ξ3,1=0.45±0.03(stat)±0.05(syst) based on a constraint on the ratio of higher-order terms from theory, which can be reliably calculated. This is compared to theoretical predictions for different nuclear models. We also extract the first value for the effective axial vector coupling constant obtained from a spectral shape study of 2νββ decay.

关键词： Double beta decay Neutrinoless double beta decay Nuclear structure & decays

来源：评论

学校读者我要写书评

暂无评论

Two-neutron halo structure of F31 and a novel pairing antihalo effect

引用

Physical Review C 2020年第4期101卷 041303(R)-041303(R)页

作者： H. Masui W. Horiuchi M. Kimura Information Processing Center Kitami Institute of Technology Kitami 090-8507 Japan Department of Physics Hokkaido University Sapporo 060-0810 Japan Nuclear Reaction Data Centre Hokkaido University Sapporo 060-0810 Japan and Research Center for Nuclear Physics (RCNP) Osaka University Ibaraki 567-0047 Japan

Background: A newly identified drip-line nucleus F31 offers a unique opportunity to study the two-neutron (2n) correlation at the east shore of the island of inversion where the N=28 shell closure is lost.

关键词： Cluster models Nuclear binding Nuclear forces Nucleon distribution Unstable nuclei induced nuclear reactions 20 ≤ A ≤ 38

来源：评论

学校读者我要写书评

暂无评论

Three-dimensional general relativistic Poynting-Robertson effect. III. Static and nonspherical quadrupolar massive source

引用

Physical Review D 2020年第12期101卷 124031-124031页

作者： Vittorio De Falco Pavel Bakala Maurizio Falanga M. R. Štefánik Observatory and Planetarium Sládkovičova 41 920 01 Hlohovec Slovak Republic Research Centre for Computational Physics and Data Processing Faculty of Philosophy & Science Silesian University in Opava Bezručovo nám. 13 CZ-74601 Opava Czech Republic International Space Science Institute Hallerstrasse 6 3012 Bern Switzerland

We investigate the three-dimensional (3D) motion of a test particle in the gravitational field generated by a nonspherical compact object endowed with a mass quadrupole moment, described by the Erez-Rosen metric, and a radiation field, including the general relativistic Poynting-Robertson (PR) effect, coming from a rigidly rotating spherical emitting source located outside of the compact object. We derive the equations of motion for test particles influenced by such radiation field, recovering the two-dimensional (2D) description, and the weak-field approximation. This dynamical system admits the existence of a critical hypersurface, region where gravitational and radiation forces balance. Selected test particle orbits for different set of input parameters are displayed. The possible configurations on the critical hypersurfaces can be either latitudinal drift toward the equatorial ring or suspended orbits. We discuss about the existence of multiple hypersurface solutions through a simple method to perform the calculations. We graphically prove also that the critical hypersurfaces are stable configurations within the Lyapunov theory.

关键词： General relativity Gravitation Classical black holes Astrophysical electromagnetic fields Numerical simulations in gravitation & astrophysics

来源：评论

学校读者我要写书评

暂无评论

Searching for asymmetric and heavily precessing Binary Black Holes in the gravitational wave data from the LIGO third Observing Run

arXiv

引用

arXiv 2024年

作者： Schmidt, Stefano Caudill, Sarah Creighton, Jolien D.E. Tsukada, Leo Doke, Anushka Jain, Manvi Ray, Anarya Adhicary, Shomik Baral, Pratyusava Baylor, Amanda Cannon, Kipp Cousins, Bryce Ewing, Becca Fong, Heather George, Richard N. Godwin, Patrick Hanna, Chad Harada, Reiko Huang, Yun-Jing Huxford, Rachael Joshi, Prathamesh Kennington, James Kuwahara, Soichiro Li, Alvin K.Y. Magee, Ryan Meacher, Duncan Messick, Cody Morisaki, Soichiro Mukherjee, Debnandini Niu, Wanting Pace, Alex Posnansky, Cort Sachdev, Surabhi Sakon, Shio Singh, Divya Shah, Urja Tapia, Ron Tsutsui, Takuya Ueno, Koh Viets, Aaron Wade, Leslie Wade, Madeline Nikhef Science Park 105 Amsterdam1098 XG Netherlands Utrecht University Princetonplein 1 Utrecht3584 CC Netherlands Department of Physics University of Massachusetts DartmouthMA02747 United States Center for Scientific Computing and Data Science Research University of Massachusetts DartmouthMA02747 United States Leonard E. Parker Center for Gravitation Cosmology and Astrophysics University of Wisconsin-Milwaukee MilwaukeeWI53201 United States Department of Physics The Pennsylvania State University University ParkPA16802 United States Institute for Gravitation and the Cosmos The Pennsylvania State University University ParkPA16802 United States International Centre for Theoretical Sciences Tata Institute of Fundamental Research Bengaluru560089 India RESCEU The University of Tokyo Tokyo113-0033 Japan Department of Physics University of Illinois UrbanaIL61801 United States Department of Physics and Astronomy University of British Columbia VancouverBCV6T 1Z4 Canada Graduate School of Science The University of Tokyo Tokyo113-0033 Japan Center for Gravitational Physics University of Texas at Austin AustinTX78712 United States LIGO Laboratory California Institute of Technology MS 100-36 PasadenaCA91125 United States Department of Astronomy and Astrophysics The Pennsylvania State University University ParkPA16802 United States Institute for Computational and Data Sciences The Pennsylvania State University University ParkPA16802 United States LIGO Laboratory California Institute of Technology PasadenaCA91125 United States MIT Kavli Institute for Astrophysics and Space Research Massachusetts Institute of Technology CambridgeMA02139 United States Institute for Cosmic Ray Research The University of Tokyo 5-1-5 Kashiwanoha Chiba Kashiwa277-8582 Japan NASA Marshall Space Flight Center HuntsvilleAL35811 United States Center for Space Plasma and Aeronomic Research University of Alabama in Huntsville HuntsvilleAL35899 United S

Leveraging the features of the GstLAL pipeline, we present the results of a matched filtering search for asymmetric binary black hole systems with heavily misaligned spins in LIGO and Virgo data taken during the third observing run. Our target systems show strong imprints of precession whereas current searches have non-optimal sensitivity in detecting them. After measuring the sensitivity improvement brought by our search over standard spin-aligned searches, we report the detection of 30 gravitational wave events already discovered in the latest version of the Gravitational Wave Transient Catalog. However, we do not find any additional significant gravitational wave candidates. Our results allow us to place an upper limit of R90% = 0.28+0−0.3304 Gpc−3yr−1 on the merger rate of a hypothetical subpopulation of asymmetric, heavily precessing signals, not identified by other searches. Since our upper limit is consistent with the latest rate estimates from the LIGO-Virgo-KAGRA collaboration, our findings rule out the existence of a yet-to-be-discovered population of precessing binaries. © 2024, CC BY.

关键词： Matched filters

来源：评论

学校读者我要写书评

暂无评论

Probing Globular Cluster with MeerKAT and FAST: A Pulsar Polarization Census

arXiv

引用

arXiv 2025年

作者： Zhang, Lei Abbate, Federico Li, Di Possenti, Andrea Bailes, Matthew Ridolfi, Alessandro Freire, Paulo C.C. Ransom, Scott M. Zhang, Yong-Kun Guo, Meng Ni, Meng-Meng Hu, Jia-Le Feng, Yi Wang, Pei Zhang, Jie Zhi, Qi-Jun National Astronomical Observatories Chinese Academy of Sciences Beijing100101 China Centre for Astrophysics and Supercomputing Swinburne University of Technology VIC3122 Australia INAF Osservatorio Astronomico di Cagliari Via della Scienza 5 SelargiusI-09047 Italy Max-Planck-Institut für Radioastronomie Auf dem Hügel 69 BonnD-53121 Germany Department of Astronomy Tsinghua University Beijing100190 China Swinburne University of Technology VIC3122 Australia Faculty of Physics University of Bielefeld Bielefeld33501 Germany National Radio Astronomy Observatory 520 Edgemont Road Charlottesville22903 United States National Supercomputing Center in Jinan Qilu University of Technology Jinan250103 China Jinan Institute of Supercomputing Technology 28666 East Jingshi Road Jinan250103 China Research Center for Intelligent Computing Platforms Zhejiang Laboratory Hangzhou311100 China Institute for Astronomy School of Physics Zhejiang University Hangzhou310027 China College of Physics and Electronic Engineering Qilu Normal University Jinan250200 China Guizhou Provincial Key Laboratory of Radio Astronomy and Data Processing Guizhou Normal University Guiyang550001 China

Only one globular cluster (GC), 47 Tuc, has been found to containintracluster medium, with an electron density 100 times higher than that of theISM in its vicinity. The characteristics of this intracluster medium areclosely related to GC evolution and the compact objects within. However,significant knowledge gaps remain regarding the ionized gas content of GCs,particularly in Galactic halo clusters. We carried out a polarization census ofGC pulsars using MeerKAT and FAST. This first combined effort of observationsfrom these two major radio telescopes resulted in high signal-to-noise ratio,full polarization pulse profiles for 43 pulsars in 8 GCs, doubling the numberof rotation measures (RMs) known in these clusters. The accuracy of dispersionmeasures (DMs) was improved by a factor of 8 compared to previous *** intracluster medium was found, and at least two halo GCs showed morestringent upper limits on electron density than that detected in 47 Tuc. Thesurprising barrenness of GCs suggests effective gas removal mechanisms, such asstrong winds from millisecond pulsars and/or ionizing radiation from post-AGBstars and young white dwarfs. Copyright © 2025, The Authors. All rights reserved.

关键词： White dwarfs

来源：评论

学校读者我要写书评

暂无评论

Observational properties of puffy disks: radiative GRMHD spectra of mildly sub-Eddington accretion

arXiv

引用

arXiv 2022年

作者： Wielgus, Maciek Lančová, Debora Straub, Odele Kluźniak, Wlodek Narayan, Ramesh Abarca, David Różańska, Agata Vincent, Frederic Török, Gabriel Abramowicz, Marek Max-Planck-Institut für Radioastronomie Auf dem Hügel 69 BonnD-53121 Germany Black Hole Initiative Harvard University 20 Garden Street CambridgeMA02138 United States Center for Astrophysics | Harvard & Smithsonian 60 Garden Street CambridgeMA02138 United States Research Center for Computational Physics and Data Processing Institute of Physics Silesian University Opava Czech Republic Nicolaus Copernicus Astronomical Centre Polish Academy of Sciences Bartycka 18 Warsaw00-716 Poland ORIGINS Excellence Cluster Boltzmannstraße 2 GarchingD-85748 Germany Max Planck Institute for Extraterrestrial Physics Gießenbachstraße 1 GarchingD-85748 Germany LESIA Observatoire de Paris Université PSL CNRS Sorbonne Universités UPMC Univ. Paris 06 Univ. de Paris Sorbonne Paris Cité 5 place Jules Janssen Meudon92195 France Department of Physics Göteborg University GöteborgSE-412-96 Sweden

Numerical general relativistic radiative magnetohydrodynamic simulations of accretion disks around a stellar mass black hole with a luminosity above 0.5 of the Eddington value reveal their stratified, elevated vertical structure. We refer to these thermally stable numerical solutions as puffy disks. Above a dense and geometrically thin core of dimensionless thickness ℎ/r ∼ 0.1, crudely resembling a classic thin accretion disk, a puffed-up, geometrically thick layer of lower density is formed. This puffy layer corresponds to ℎ/r ∼ 1.0, with a very limited dependence of the dimensionless thickness on the mass accretion rate. We discuss the observational properties of puffy disks, in particular the geometrical obscuration of the inner disk by the elevated puffy region at higher observing inclinations, and collimation of the radiation along the accretion disk spin axis, which may explain the apparent super-Eddington luminosity of some X-ray objects. We also present synthetic spectra of puffy disks, and show that they are qualitatively similar to those of a Comptonized thin disk. We demonstrate that the existing xspec spectral fitting models provide good fits to synthetic observations of puffy disks, but cannot correctly recover the input black hole spin. The puffy region remains optically thick to scattering;in its spectral properties the puffy disk roughly resembles that of a warm corona sandwiching the disk core. We suggest that puffy disks may correspond to X-ray binary systems of luminosities above 0.3 of the Eddington luminosity in the intermediate spectral states. © 2022, CC BY.

关键词： Luminance

来源：评论

学校读者我要写书评

暂无评论

KURVS: The outer rotation curve shapes and dark matter fractions of z ∼ 1.5 star-forming galaxies

arXiv

引用

arXiv 2023年

作者： Puglisi, Annagrazia Dudzevičiūte, Ugne Swinbank, Mark Gillman, Steven Tiley, Alfred L. Bower, Richard G. Cirasuolo, Michele Cortese, Luca Glazebrook, Karl Harrison, Chris Ibar, Edo Molina, Juan Obreschkow, Danail Oman, Kyle A. Schaller, Matthieu Shankar, Francesco Sharples, Ray M. Centre for Extragalactic Astronomy Department of Physics Durham University South Road DurhamDH1 3LE United Kingdom School of Physics and Astronomy University of Southampton Highfield SO17 1BJ United Kingdom Max-Planck-Institut für Astronomie Königstuhl 17 HeidelbergD-69117 Germany Denmark DTU-Space Technical University of Denmark Elektrovej 327 Kgs. LyngbyDK-2800 Denmark International Centre for Radio Astronomy Research University of Western Australia 35 Stirling Highway CrawleyWA6009 Australia Institute for Computational Cosmology Durham University South Road DurhamDH1 3LE United Kingdom Institute for Data Science Department of Physics Durham University South Road DurhamDH1 3LE United Kingdom European Southern Observatory Karl-Schwarzschild-Str 2 Garching b. MünchenD-86748 Germany Australia Centre for Astrophysics and Supercomputing Swinburne University of Technology PO Box 218 HawthornVIC3122 Australia School of Mathematics Statistics and Physics Newcastle University Newcastle upon TyneNE1 7RU United Kingdom Instiuto de Física y Astronomía Universidad de Valparaíso Avda. Gran Bretaña 1111 Valparaíso Chile Department of Space Earth and Environment Chalmers University of Technology Onsala Space Observatory Onsala439 92 Sweden Australian Research Council Centre of Excellence for All-Sky Astrophysics 44 Rosehill Street RedfernNSW2016 Australia Department of Physics Durham University South Road DurhamDH1 3LE United Kingdom Lorentz Institute for Theoretical Physics Leiden University PO Box 9506 LeidenNL-2300 RA Netherlands Leiden Observatory Leiden University PO Box 9513 LeidenNL-2300 RA Netherlands Centre for Advanced Instrumentation Department of Physics Durham University South Road DurhamDH1 3LE United Kingdom

We present first results from the KMOS Ultra-deep Rotation Velocity Survey (KURVS), aimed at studying the outer rotation curves shape and dark matter content of 22 star-forming galaxies at z ∼ 1.5. These galaxies represent ‘typical’ star-forming discs at z ∼ 1.5, being located within the star-forming main sequence and stellar mass-size relation with stellar masses 9.5 6 log(M★/M☉) 6 11.5. We use the spatially-resolved Hα emission to extract individual rotation curves out to 4 times the effective radius, on average, or ∼ 10 − 15 kpc. Most rotation curves are flat or rising between three and six disc scale radii. Only three objects with dispersion-dominated dynamics (vrot/σ0 ∼ 0.2) have declining outer rotation curves at more than 5σ significance. After accounting for seeing and pressure support, the nine rotation-dominated discs with vrot/σ0 > 1.5 have average dark matter fractions of 50 ± 20% at the effective radius, similar to local discs. Together with previous observations of star-forming galaxies at cosmic noon, our measurements suggest a trend of declining dark matter fraction with increasing stellar mass and stellar mass surface density at the effective radius. Measurements of simulated EAGLE galaxies are in quantitative agreement with observations up to log(M★Reff−2/M☉ kpc−2) ∼ 9.2, and over-predict the dark matter fraction of galaxies with higher mass surface densities by a factor of ∼ 3. We conclude that the dynamics of typical rotationally-supported discs at z ∼ 1.5 is dominated by dark matter from effective radius scales, in broad agreement with cosmological models. The tension with observations at high stellar mass surface density suggests that the prescriptions for baryonic processes occurring in the most massive galaxies (such as bulge growth and quenching) need to be reassessed. Copyright © 2023, The Authors. All rights reserved.

关键词： Galaxies

来源：评论

学校读者我要写书评

暂无评论

When to Point Your Telescopes: Gravitational Wave Trigger Classification for Real-Time Multi-Messenger Followup Observations

arXiv

引用

arXiv 2023年

作者： Ray, Anarya Niu, Wanting Sakon, Shio Ewing, Becca Creighton, Jolien D.E. Hanna, Chad Adhicary, Shomik Baral, Pratyusava Baylor, Amanda Cannon, Kipp Caudill, Sarah Cousins, Bryce Fong, Heather George, Richard N. Godwin, Patrick Harada, Reiko Huang, Yun-Jing Huxford, Rachael Joshi, Prathamesh Kapadia, Shasvath Kennington, James Kuwahara, Soichiro Li, Alvin K.Y. Magee, Ryan Meacher, Duncan Messick, Cody Morisaki, Soichiro Mukherjee, Debnandini Pace, Alex Posnansky, Cort Sachdev, Surabhi Singh, Divya Tapia, Ron Tsukada, Leo Tsutsui, Takuya Ueno, Koh Viets, Aaron Wade, Leslie Wade, Madeline Leonard E. Parker Center for Gravitation Cosmology and Astrophysics University of Wisconsin-Milwaukee MilwaukeeWI53201 United States Department of Physics The Pennsylvania State University University ParkPA16802 United States Institute for Gravitation and the Cosmos The Pennsylvania State University University ParkPA16802 United States RESCEU The University of Tokyo Tokyo113-0033 Japan Department of Physics University of Massachusetts DartmouthMA02747 United States Center for Scientific Computing and Data Science Research University of Massachusetts DartmouthMA02747 United States Department of Physics University of Illinois UrbanaIL61801 United States Department of Physics and Astronomy University of British Columbia VancouverBCV6T 1Z4 Canada Graduate School of Science The University of Tokyo Tokyo113-0033 Japan Center for Gravitational Physics University of Texas at Austin AustinTX78712 United States LIGO Laboratory California Institute of Technology MS 100-36 PasadenaCA91125 United States The Inter-University Centre for Astronomy and Astrophysics Post Bag 4 Ganeshkhind Pune411007 India MIT Kavli Institute for Astrophysics and Space Research Massachusetts Institute of Technology CambridgeMA02139 United States Institute for Cosmic Ray Research The University of Tokyo 5-1-5 Kashiwanoha Kashiwa Chiba277-8582 Japan NASA Marshall Space Flight Center HuntsvilleAL35811 United States Center for Space Plasma and Aeronomic Research University of Alabama in Huntsville HuntsvilleAL35899 United States School of Physics Georgia Institute of Technology AtlantaGA30332 United States Institute for Computational and Data Sciences The Pennsylvania State University University ParkPA16802 United States Concordia University Wisconsin MequonWI53097 United States Department of Physics Hayes Hall Kenyon College GambierOH43022 United States

We develop a robust and self-consistent framework to extract and classify gravitational wave candidates from noisy data, for the purpose of assisting in real-time multi-messenger follow-ups during LIGO-Virgo-KAGRA’s fourth observing run (O4). Our formalism implements several improvements to the low latency calculation of the probability of astrophysical origin (Pastro), so as to correctly account for various factors such as the sensitivity change between observing runs, and the deviation of the recovered template waveform from the true gravitational wave signal that can strongly bias said calculation. We demonstrate the high accuracy with which our new formalism recovers and classifies gravitational wave triggers, by analyzing replay data from previous observing runs injected with simulated sources of different categories. We show that these improvements enable the correct identification of the majority of simulated sources, many of which would have otherwise been misclassified. We carry out the aforementioned analysis by implementing our formalism through the GstLAL search pipeline even though it can be used in conjunction with potentially any matched filtering pipeline. Armed with robust and self-consistent Pastro values, the GstLAL pipeline can be expected to provide accurate source classification information for assisting in multi-messenger follow-up observations to gravitational wave alerts sent out during O4. © 2023, CC BY.

关键词： Gravity waves

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：