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A study of Galactic Plane Planck Galactic cold clumps observed by SCOPE and the JCMT Plane Survey

Monthly Notices of the Royal Astronomical Society 2024年第4期530卷 5192-5208页

作者： Eden, D.J. Liu, Tie Moore, T.J.T. Di Francesco, J. Fuller, G. Kim, Kee-Tae Li, Di Liu, S.-Y. Plume, R. Tatematsu, Ken'ichi Thompson, M.A. Wu, Y. Bronfman, L. Butner, H.M. Currie, M.J. Garay, G. Goldsmith, P.F. Hirano, N. Johnstone, D. Juvela, M. Lai, S.-P. Lee, C.W. Mannfors, E.E. Olguin, F. Pattle, K. Park, Geumsook Polychroni, D. Rawlings, M. Rigby, A.J. Sanhueza, P. Traficante, A. Urquhart, J.S. Weferling, B. White, G.J. Yadav, R.K. Armagh Observatory and Planetarium College Hill ArmaghBT61 9DB United Kingdom Shanghai Astronomical Observatory Chinese Academy of Sciences 80 Nandan Road Shanghai200030 China Astrophysics Research Institute Liverpool John Moores University Liverpool Science Park iC2 146 Brownlow Hill LiverpoolL3 5RF United Kingdom NRC Herzberg Astronomy and Astrophysics 5071 West Saanich Rd VictoriaBCV9E 2E7 Canada Department of Physics and Astronomy University of Victoria VictoriaBCV8W 2Y2 Canada Jodrell Bank Centre for Astrophysics School of Physics and Astronomy The University of Manchester Oxford Road ManchesterM13 9PL United Kingdom Korea Astronomy and Space Science Institute 776 Daedeokdae-ro Yuseong-gu Daejon34055 Korea Republic of 217 Gajeong-ro Yuseong-gu Daejeon34113 Korea Republic of NationalAstronomicalObservatories ChineseAcademyofSciences Beijing100012 China Key Laboratory of Radio Astronomy Chinese Academy of Science Nanjing210008 China Academia Sinica Institute of Astronomy and Astrophysics 11F of AS/NTU Astronomy – Mathematics Building No.1 Section 4 Roosevelt Rd Taipei10617 Taiwan Department of Physics and Astronomy University of Calgary 2500 University Drive NW CalgaryABT2N 1N4 Canada Nobeyama Radio Observatory National Astronomical Observatory of Japan National Institutes of Natural Sciences Nobeyama Minamimaki Minamisaku Nagano384-1305 Japan Astronomical Science Program Graduate Institute for Advanced Studies SOKENDAI 2-21-1 Osawa Mitaka Tokyo181-8588 Japan School of Physics and Astronomy University of Leeds LeedsLS2 9JT United Kingdom Department of Astronomy Peking University Beijing100871 China Astronomy Department Universidad de Chile Casilla 36-D Santiago7591245 Chile Department of Physics and Astronomy James Madison University MSC 4502 901 Carrier Drive HarrisonburgVA22807 United States RAL Space STFC Rutherford Appleton Laboratory Chilton Didcot OxfordshireOX11 0QX United Kingdom East Asian Obser

We have investigated the physical properties of Planck Galactic Cold Clumps (PGCCs) located in the Galactic Plane, using the JCMT Plane Survey (JPS) and the SCUBA-2 Continuum Observations of Pre-protostellar Evolution (SCOPE) survey. By utilizing a suite of molecular-line surveys, velocities, and distances were assigned to the compact sources within the PGCCs, placing them in a Galactic context. The properties of these compact sources show no large-scale variations with Galactic environment. Investigating the star-forming content of the sample, we find that the luminosity-to-mass ratio (L/M) is an order of magnitude lower than in other Galactic studies, indicating that these objects are hosting lower levels of star formation. Finally, by comparing ATLASGAL sources that are associated or are not associated with PGCCs, we find that those associated with PGCCs are typically colder, denser, and have a lower L/M ratio, hinting that PGCCs are a distinct population of Galactic Plane sources. © 2024 The Author(s).

关键词： Stars

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EEG dataset classification using CNN method

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Journal of Physics: Conference Series 2020年第1期1456卷

作者： W-L Mao H I K Fathurrahman Y Lee T W Chang Department of Electrical Engineering Graduate School of Engineering Science and Technology National Yunlin University of Science and Technology Douliu 64002 Taiwan Bachelor Program in Interdisciplinary Studies College of Future National Yunlin University of Science and Technology Department of Digital Media Design National Yunlin University of Science and Technology

This paper proposes a simple Convolutional Neural Network (CNN) program to classify epileptic seizure. The diagnosis of epileptic seizure involves the identification and different characteristic of the Electroencephalography (EEG) signal. As such, it needs a method for identifying and classifying epileptic seizure. Deep learning is part of a neural network that has the ability and pattern to identify and classify epileptic seizure. CNN has been demonstrated high performance on image classification and pattern detection. In this paper, we combine the continuous wavelet transform (CWT) and CNN to classify epileptic seizure. This experiment uses the wavelet transform to convert signal data of EEG to time-frequency domain images. The output of the wavelet transform is an image that will classify into five attributes. In this experiment, we develop a simple program that will compare with other CNN approach (AlexNet and GoogleNet). The results of this experiment are two kinds of data, accuracy, and loss. The resulting accuracy is 72.49%, and the loss is 0.576. This result has a better learning time than GoogleNet and smaller loss result than AlexNet.

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A new family of tractable ising models

arXiv

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arXiv 2019年

作者： Likhosherstov, Valerii Maximov, Yury Chertkov, Michael Skolkovo Institute of Science and Technology Moscow Russia Theoretical Division and Center for Nonlinear Studies Los Alamos National Laboratory Los AlamosNM United States Graduate Program in Applied Mathematics University of Arizona TucsonAZ United States

We present a new family of zero-field Ising models over N binary variables/spins obtained by consecutive "gluing" of planar and O(1)-sized components along with subsets of at most three vertices into a tree. The polynomial time algorithm of the dynamic programming type for solving exact inference (partition function computation) and sampling consists of a sequential application of an efficient (for planar) or brute-force (for O(1)-sized) inference and sampling to the components as a black box. To illustrate utility of the new family of tractable graphical models, we first build an O(N 32 ) algorithm for inference and sampling of the K5-minor-free zero-field Ising models-an extension of the planar zero-field Ising models-which is neither genus- nor treewidth-bounded. Second, we demonstrate empirically an improvement in the approximation quality of the NP-hard problem of the square-grid Ising model (with non-zero field) inference. Copyright © 2019, The Authors. All rights reserved.

关键词： Ising model

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Retraction notice to "Hydrological and climate impacts on river characteristics of Pahang River Basin, Malaysia" [ Heliyon 9 2023 e21573]

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Heliyon 2025年第1期11卷 e41351页

作者： Mohd Khairul Amri Kamarudin Mohd Ekhwan Toriman Noorjima Abd Wahab Mohd Armi Abu Samah Khairul Nizam Abdul Maulud Firdaus Mohamad Hamzah Ahmad Shakir Mohd Saudi Sunardi Sunardi Faculty of Applied Social Science University Sultan Zainal Abidin Gong Badak Campus 21300 Terengganu Malaysia. East Coast Environmental Research Institute (ESERI) University Sultan Zainal Abidin Gong Badak Campus Nerus 21300 Kuala Malaysia. Faculty of Social Sciences and Humanities National University of Malaysia 43600 Bangi Selangor Malaysia. Kulliyyah of Science International Islamic University Malaysia 25200 Kuantan Pahang Malaysia. Earth Observation Center Institute of Climate Change National University of Malaysia 43600 Bangi Selangor Malaysia. Department of Mathematics Defense Base Center National Defence University of Malaysia Sungai Besi Camp 57000 Kuala Lumpur Malaysia. Department of Environmental Health Institute of Medical Science Technology Universiti Kuala Lumpur Kajang Selangor Malaysia. Graduate Program on Environmental Studies Postgraduate School Universitas Padjadjaran Jl. Dipati Ukur No. 35 Bandung 40132 Indonesia.

[This retracts the article DOI: 10.1016/***.2023.e21573.].

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JASMINE: Near-Infrared Astrometry and Time Series Photometry science

arXiv

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arXiv 2023年

作者： Kawata, Daisuke Kawahara, Hajime Gouda, Naoteru Secrest, Nathan J. Kano, Ryouhei Kataza, Hirokazu Isobe, Naoki Ohsawa, Ryou Usui, Fumihiko Yamada, Yoshiyuki Graham, Alister W. Pettitt, Alex R. Asada, Hideki Baba, Junichi Bekki, Kenji Dorland, Bryan N. Fujii, Michiko Fukui, Akihiko Hattori, Kohei Hirano, Teruyuki Kamizuka, Takafumi Kashima, Shingo Kawanaka, Norita Kawashima, Yui Klioner, Sergei A. Kodama, Takanori Koshimoto, Naoki Kotani, Takayuki Kuzuhara, Masayuki Levine, Stephen E. Majewski, Steven R. Masuda, Kento Matsunaga, Noriyuki Miyakawa, Kohei Miyoshi, Makoko Morihana, Kumiko Nishi, Ryoichi Notsu, Yuta Omiya, Masashi Sanders, Jason Tanikawa, Ataru Tsujimoto, Masahiro Yano, Taihei Aizawa, Masataka Arimatsu, Ko Biermann, Michael Boehm, Celine Chiba, Masashi Debattista, Victor P. Gerhard, Ortwin Hirabayashi, Masayuki Hobbs, David Ikenoue, Bungo Izumiura, Hideyuki Jordi, Carme Kohara, Naoki Löffler, Wolfgang Luri, Xavier Mase, Ichiro Miglio, Andrea Mitsuda, Kazuhisa Newswander, Trent Nishiyama, Shogo Obuchi, Yoshiyuki Ootsubo, Takafumi Ouchi, Masami Ozaki, Masanobu Perryman, Michael Prusti, Timo Ramos, Pau Read, Justin I. Rich, R. Michael Schönrich, Ralph Shikauchi, Minori Shimizu, Risa Suematsu, Yoshinori Tada, Shotaro Takahashi, Aoi Tatekawa, Takayuki Tatsumi, Daisuke Tsujimoto, Takuji Tsuzuki, Toshihiro Urakawa, Seitaro Uraguchi, Fumihiro Utsunomiya, Shin Van Eylen, Vincent van Leeuwen, Floor Wada, Takehiko Walton, Nicholas A. National Astronomical Observatory of Japan 2-21-1 Osawa Mitaka Tokyo181-8588 Japan Mullard Space Science Laboratory University College London Holmbury St. Mary Dorking SurreyRH5 6NT United Kingdom Institute of Space and Astronautical Science Japan Aerospace Exploration Agency 3-1-1 Yoshinodai Chuo-ku Kanagawa Sagamihara252-5210 Japan Astronomical Science Program Graduate Institute for Advanced Studies SOKENDAI 2-21-1 Osawa Mitaka Tokyo181-1855 Japan U.S. Naval Observatory 3450 Massachusetts Ave NW WashingtonDC20392-5420 United States Department of Physics Kyoto University Kitashirakawa-oiwake-cho Sakyo-ku Kyoto606-8502 Japan Centre for Astrophysics and Supercomputing Swinburne University of Technology HawthornVIC3122 Australia Department of Physics and Astronomy California State University Sacramento 6000 J Street SacramentoCA95819-6041 United States Graduate School of Science and Technology Hirosaki University Aomori036-8561 Japan Graduate School of Science and Engineering Kagoshima University 1-21-35 Korimoto Kagoshima890-0065 Japan International Centre for Radio Astronomy Research The University of Western Australia 7 Fairway CrawleyWA6009 Australia Department of Astronomy Graduate School of Science The University of Tokyo 7-3-1 Hongo Bunkyo-ku Tokyo113-0033 Japan Department of Earth and Planetary Science Graduate School of Science The University of Tokyo 7-3-1 Hongo Bunkyo-ku Tokyo113-0033 Japan Institute of Statistical Mathematics 10-3 Midoricho Tachikawa Tokyo190-8562 Japan Astrobiology Center 2-21-1 Osawa Mitaka Tokyo181-8588 Japan Institute of Astronomy Graduate School of Science The University of Tokyo 2-21-1 Osawa Mitaka Tokyo181-0015 Japan Center for Gravitational Physics and Quantum Information Yukawa Institute for Theoretical Physics Kyoto University Kitashirakawa-oiwake-cho Sakyo-ku Kyoto606-8502 Japan Cluster for Pioneering Research RIKEN 2-1 Hirosawa Saitama Wako351-0198 Japan Lohrmann Observ

Japan Astrometry Satellite Mission for INfrared Exploration (JASMINE) is a planned M-class science space mission by the Institute of Space and Astronautical science, the Japan Aerospace Exploration Agency. JASMINE has two main science goals. One is the Galactic archaeology with Galactic Center Survey, which aims to reveal the Milky Way's central core structure and formation history from Gaia-level (∼25 µas) astrometry in the Near-Infrared (NIR) Hw-band (1.0-1.6 µm). The other is the Exoplanet Survey, which aims to discover transiting Earth-like exoplanets in the habitable zone from NIR time-series photometry of M dwarfs when the Galactic center is not accessible. We introduce the mission, review many science objectives, and present the instrument concept. JASMINE will be the first dedicated NIR astrometry space mission and provide precise astrometric information of the stars in the Galactic center, taking advantage of the significantly lower extinction in the NIR. The precise astrometry is obtained by taking many short-exposure images. Hence, the JASMINE Galactic center survey data will be valuable for studies of exoplanet transits, asteroseismology, variable stars and microlensing studies, including discovery of (intermediate mass) black holes. We highlight a swath of such potential science, and also describe synergies with other missions. © 2023, CC BY.

关键词： Time series

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Drying properties of Sentang (Azadirachta excelsa) dried under different temperatures

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IOP Conference Series: Earth and Environmental science 2020年第1期596卷

作者： Noor Zulai'ha Mohamad Ruddin Shaharlina Rasid Andi Hermawan Forest Resource Technology Program Bachelor of Applied Science Faculty of Bioengineering and Technology Universiti Malaysia Kelantan Kelantan Malaysia Forest Resource Technology Centre for Post Graduate Studies Universiti Malaysia Kelantan Pangkalan Chepa Malaysia Forest Resource Technology Program Faculty of Bioengineering and Technology Universiti Malaysia Kelantan Kelantan Malaysia

In this study, we investigated the drying properties of Sentang (Azadirachta excelsa) dried at different temperatures. Sentang tree planted in Kelantan, Malaysia, was used in this study. Drying specimens with dimensions of 30 ×150 × 500 mm were dried under air-drying conditions, a constant temperature of 60, 80, 100, and 120 °C until the moisture content (MC) of the specimens reaches an equilibrium moisture content (EMC) at each drying condition. The drying properties of the specimens were then examined. The results confirmed that drying temperature had a significant effect on drying time. As expected, drying Sentang under air-drying conditions demanding considerable time than the other drying conditions.

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Novel eco-friendly acid-base indicators from innovative plant-based sources: Water-based extraction and applications in titration

Next Research

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Next Research 2025年第1期2卷

作者： Sinélcio Samuel Taualia Ali Achira Germildo Juvenal Muchave Célio Matias Airone Macalia Neuana Fernando Neuana Ana Paula Capelezzo Raimundo Rafael Gamela Domingos Lusitâneo Pier Macuvele Department of Science Engineering Technology and Mathematics Center for Studies in Science and Technology (NECET) University of Rovuma Lichinga Niassa Mozambique Instituto de Química e Biotecnologia (IQB/UFAL) Universidade Federal de Alagoas Maceió Brazil Research Department Open University ISCED Rua Paiva Couceiro 148/07 Macuti Beira Mozambique Green Technologies Laboratory Escola de Química Universidade Federal do Rio de Janeiro Rio de Janeiro Rio de Janeiro 21941-909 Brazil Programa de Pós-graduação em Ciência e Engenharia de Materiais-PPGCEM Universidade Federal de Amazonas Manaus Amazonas Brazil Chemical Department Engineering Community University of Chapecó Region (Unochapecó) Chapecó SC Brazil Division of Agriculture High Polytechnique Institute of Gaza (ISPG) Lionde Chòkwé Gaza CP 1204 Mozambique Graduate Program in Chemical Enginering Santa Catarina Federal University (UFSC) Florianópolis SC Brazil

Researching new plants as potential green indicators marks a meaningful step toward sustainability in analytical chemistry. This study aimed to identify plants with viable applications as eco-friendly indicators in acid-base titration. For this purpose, ten plants were selected based on distinct color properties, namely Euphorbia cotinifolia, Acalypha wilkesiana, Alternanthera brasiliana, Mirabilis jalapa, Datura metel, Euphorbia milii, Jacaranda mimosifolia, Luffa aegyptiaca, Senna didymobotrya , and Canna indica . Aqueous extracts were obtained by maceration, and their performance as acid-base indicators was evaluated and compared with synthetic indicators phenolphthalein and bromothymol blue. The results demonstrated that six of the ten extracts— Euphorbia cotinifolia, Acalypha wilkesiana, Alternanthera brasiliana, Mirabilis jalapa, Datura metel , and Euphorbia milii —were effective in producing visible color changes across pH levels. Notably, the extracts of Alternanthera brasiliana, Acalypha wilkesiana , and Euphorbia milii exhibited highly perceptible color transitions at different pH values, with equivalence points that closely aligned with those obtained by synthetic indicators in all titration types. The titrant volume using natural acid-base indicators was between 4.21 ± 0.06 mL (CH 3 COOH/NH 4 OH) and 7.60 ± 0.44 mL (HCl/NH 4 OH). Statistical analysis revealed significant differences in titrant excesses between these natural extracts and synthetic indicators, with Acalypha wilkesiana and Alternanthera brasiliana achieving up to 15×10 -5 lower HCl excess, indicating their sensitive and precise response in color transition, reinforcing their potential as reliable acid-base indicators. These findings validate the ecological and practical advantages of these plant-based indicators, which are locally available, cost-effective, and stable throughout titrations. As such, they represent a promising and sustainable alternative for laboratories and industries, with

关键词： Plant extracts Eco-friendly acid-base indicators Titration Environment sustainability Green chemistry

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Precessing jet nozzle connecting to a spinning black hole in M87

arXiv

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arXiv 2023年

作者： Cui, Yuzhu Hada, Kazuhiro Kawashima, Tomohisa Kino, Motoki Lin, Weikang Mizuno, Yosuke Ro, Hyunwook Honma, Mareki Yi, Kunwoo Yu, Jintao Park, Jongho Jiang, Wu Shen, Zhiqiang Kravchenko, Evgeniya Algaba, Juan-Carlos Cheng, Xiaopeng Cho, Ilje Giovannini, Gabriele Giroletti, Marcello Jung, Taehyun Lu, Ru-Sen Niinuma, Kotaro Oh, Junghwan Ohsuga, Ken Sawada-Satoh, Satoko Sohn, Bong Won Takahashi, Hiroyuki R. Takamura, Mieko Tazaki, Fumie Trippe, Sascha Wajima, Kiyoaki Akiyama, Kazunori An, Tao Asada, Keiichi Buttaccio, Salvatore Byun, Do-Young Cui, Lang Hagiwara, Yoshiaki Hirota, Tomoya Hodgson, Jeffrey Kawaguchi, Noriyuki Kim, Jae-Young Lee, Sang-Sung Lee, Jee Won Lee, Jeong Ae Maccaferri, Giuseppe Melis, Andrea Melnikov, Alexey Migoni, Carlo Oh, Se-Jin Sugiyama, Koichiro Wang, Xuezheng Zhang, Yingkang Chen, Zhong Hwang, Ju-Yeon Jung, Dong-Kyu Kim, Hyo-Ryoung Kim, Jeong-Sook Kobayashi, Hideyuki Li, Bin Li, Guanghui Li, Xiaofei Liu, Zhiyong Liu, Qinghui Liu, Xiang Oh, Chung-Sik Oyama, Tomoaki Roh, Duk-Gyoo Wang, Jinqing Wang, Na Wang, Shiqiang Xia, Bo Yan, Hao Yeom, Jae-Hwan Yonekura, Yoshinori Yuan, Jianping Zhang, Hua Zhao, Rongbing Zhong, Weiye Research Center for Intelligent Computing Platforms Zhejiang Laboratory Hangzhou311100 China Tsung-Dao Lee Institute Shanghai Jiao Tong University 520 Shengrong Road Shanghai201210 China Astronomical Science Program The Graduate University for Advanced Studies SOKENDAI 2-21-1 Osawa Mitaka Tokyo181-8588 Japan Mizusawa VLBI Observatory National Astronomical Observatory of Japan 2-12 Hoshigaoka Mizusawa Iwate Oshu023-0861 Japan Institute for Cosmic Ray Research The University of Tokyo 5-1-5 Kashiwanoha Chiba Kashiwa277-8582 Japan Kogakuin University of Technology & Engineering Academic Support Center 2665-1 Nakano-machi Hachioji Tokyo192-0015 Japan South-Western Institute For Astronomy Research Yunnan University Kunming650500 China School of Physics and Astronomy Shanghai Jiao Tong University Shanghai200240 China Institut für Theoretische Physik Goethe-Universität Frankfurt Max-von-Laue-Straße 1 Frankfurt am MainD-60438 Germany Korea Astronomy & Space Science Institute Daedeokdae-ro 776 Yuseong-gu Daejeon34055 Korea Republic of Department of Astronomy Yonsei University Yonsei-ro 50 Seodaemun-gu Seoul03722 Korea Republic of Department of Astronomy Graduate School of Science The University of Tokyo 7-3-1 Hongo Bunkyo Tokyo113-0033 Japan Department of Physics and Astronomy Seoul National University Gwanak-gu Seoul08826 Korea Republic of Department of Information Countermeasure Air Force Early Warning Academy Wuhan430019 China Institute of Astronomy and Astrophysics Academia Sinica HiloHI96720 United States Shanghai Astronomical Observatory Chinese Academy of Sciences 80 Nandan Road Shanghai200030 China Key Laboratory of Radio Astronomy Chinese Academy of Sciences Beijing100101 China Moscow Institute of Physics and Technology Dolgoprudny Institutsky per. 9 Moscow141700 Russia Lebedev Physical Institute The Russian Academy of Sciences Leninsky prospekt 53 Moscow119991 Russia Department of Physics Faculty of Science U

The nearby radio galaxy M87 offers a unique opportunity to explore the connections between the central supermassive black hole and relativistic jets. Previous studies of the inner region of M87 revealed a wide opening angle for the jet originating near the black hole 1–4. The Event Horizon Telescope resolved the central radio source and found an asymmetric ring structure consistent with expectations from General Relativity 5. With a baseline of 17 years of observations, there was a shift in the jet’s transverse position, possibly arising from an eight to ten-year quasi-periodicity 3. However, the origin of this sideways shift remains unclear. Here we report an analysis of radio observations over 22 years that suggests a period of about 11 years in the position angle variation of the jet. We infer that we are seeing a spinning black hole that induces the Lense-Thirring precession of a misaligned accretion disk. Similar jet precession may commonly occur in other active galactic nuclei but has been challenging to detect owing to the small magnitude and long period of the variation. Copyright © 2023, The Authors. All rights reserved.

关键词： Active Galactic Nuclei

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Publisher Correction: Atomistic insights into highly active reconstructed edges of monolayer 2H-WSe2 photocatalyst

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Nature communications 2022年第1期13卷 1755页

作者： Mohammad Qorbani Amr Sabbah Ying-Ren Lai Septia Kholimatussadiah Shaham Quadir Chih-Yang Huang Indrajit Shown Yi-Fan Huang Michitoshi Hayashi Kuei-Hsien Chen Li-Chyong Chen Center for Condensed Matter Sciences National Taiwan University Taipei 10617 Taiwan. Center of Atomic Initiative for New Materials National Taiwan University Taipei 10617 Taiwan. Institute of Atomic and Molecular Sciences Academia Sinica Taipei 10617 Taiwan. On leave from Tabbin Institute for Metallurgical Studies Tabbin Helwan 109 Cairo 11421 Egypt. Department of Physics National Taiwan University Taipei 10617 Taiwan. Nano Science and Technology Taiwan International Graduate Program Academia Sinica Taipei 11529 Taiwan. Institute of Physics Academia Sinica Taipei 11529 Taiwan. Molecular Science and Technology Program Taiwan International Graduate Program Academia Sinica Taipei 11529 Taiwan. Department of Physics National Central University Taoyuan City 32001 Taiwan. International Graduate Program of Molecular Science and Technology National Taiwan University Taipei 10617 Taiwan. Department of Chemistry Hindustan Institute of Technology and Science Chennai 603103 India. Center for Condensed Matter Sciences National Taiwan University Taipei 10617 Taiwan. chenkh@pub.iams.sinica.edu.tw. Institute of Atomic and Molecular Sciences Academia Sinica Taipei 10617 Taiwan. chenkh@pub.iams.sinica.edu.tw. Center for Condensed Matter Sciences National Taiwan University Taipei 10617 Taiwan. chenlc@ntu.edu.tw. Center of Atomic Initiative for New Materials National Taiwan University Taipei 10617 Taiwan. chenlc@ntu.edu.tw. Department of Physics National Taiwan University Taipei 10617 Taiwan. chenlc@ntu.edu.tw.

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ATOMS: ALMA Three-millimeter Observations of Massive Star-forming regions - XIX. The origin of SiO emission

arXiv

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arXiv 2024年

作者： Liu, Rong Liu, Tie Jiménez-Serra, Izaskun Li, Jin-Zeng Martín-Pintado, Jesús Liu, Xunchuan Lee, Chang Won Sanhueza, Patricio Chibueze, James O. Rivilla, Víctor M. Juvela, Mika Colzi, Laura Bronfman, Leonardo Liu, Hong-Li Sanz-Novo, Miguel López-Gallifa, Álvaro Li, Shanghuo Megías, Andrés Andrés, David San Garay, Guido Hwang, Jihye Zhou, Jianwen Xu, Fengwei Martínez-Henares, Antonio Saha, Anindya Nazeer, Hafiz National Astronomical Observatories of China Chinese Academy of Sciences Beijing100012 China University of Chinese Academy of Sciences Beijing100049 China Shanghai Astronomical Observatory Chinese Academy of Sciences 80 Nandan Road Shanghai200030 China CSIC-INTA Carretera de Ajalvir km 4 Torrejón de Ardoz28850 Spain Korea Astronomy and Space Science Institute 776 Daedeokdae-ro Yuseong-gu Daejeon34055 Korea Republic of 217 Gajeong-ro Yuseong-gu Daejeon34113 Korea Republic of National Astronomical Observatory of Japan National Institutes of Natural Sciences 2-21-1 Osawa Mitaka Tokyo181-8588 Japan Astronomical Science Program The Graduate University for Advanced Studies SOKENDAI 2-21-1 Osawa Mitaka Tokyo181-8588 Japan Department of Mathematical Sciences University of South Africa Cnr Christian de Wet Rd and Pioneer Avenue Florida Park Roodepoort1709 South Africa Department of Physics and Astronomy Faculty of Physical Sciences University of Nigeria Carver Building 1 University Road Nsukka410001 Nigeria Department of Physics University of Helsinki P.O. Box 64 FI-00014 Finland Departamento de Astronomía Universidad de Chile Las Condes Santiago Chile School of Physics and Astronomy Yunnan University Kunming650091 China Max Planck Institute for Astronomy Königstuhl 17 HeidelbergD-69117 Germany Max-Planck-Institut für Radioastronomie Auf dem Hügel 69 Bonn53125 Germany Kavli Institute for Astronomy and Astrophysics Peking University Haidian District Beijing100871 China Department of Astronomy School of Physics Peking University Beijing100871 China Indian Institute of Space Science and Technology Kerala Thiruvananthapuram695 547 India Chinese Academy of Sciences South America Center for Astronomy National Astronomical Observatories CAS Beijing100101 China

The production of silicon monoxide (SiO) can be considered as a fingerprint of shock interaction. In this work, we use high-sensitivity observations of the SiO (2-1) and H13CO+ (1-0) emission to investigate the broad and narrow SiO emission toward 146 massive star-forming regions in the ATOMS survey. We detected SiO emission in 136 regions and distinguished broad and narrow components across the extension of 118 sources (including 58 UC Hii regions) with an average angular resolution of 2.5′′. The derived SiO luminosity (LSiO) across the whole sample shows that the majority of LSiO (above 66%) can be attributed to broad SiO, indicating its association with strong outflows. The comparison of the ALMA SiO images with the filamentary skeletons identified from H13CO+ and in the infrared data (at 4.5, 8, and 24 µm), further confirms that most SiO emission originates from outflows. However, note that for nine sources in our sample, the observed SiO emission may be generated by expanding UC Hii regions. There is a moderate positive correlation between the bolometric luminosity (Lbol) and LSiO for both components (narrow and broad). The UC Hii sources show a weaker positive correlation between Lbol and LSiO and higher LSiO compared to the sources without UC Hii regions. These results imply that the SiO emission from UC Hii sources might be affected by UV-photochemistry induced by UC Hii regions. © 2024, CC BY.

关键词： Giant stars

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