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A Search for Pulsars around Sgr A* in the First Event Horizon Telescope Data Set

文献类型：期刊论文

作者Torne, Pablo76,77; Liu, Kuo77; Eatough, Ralph P.77,78; Wongphechauxsorn, Jompoj77; Cordes, James M.79; Desvignes, Gregory77,80; Laurentis, Mariafelicia De81,82,83; Kramer, Michael77,84; Ransom, Scott M.85; Chatterjee, Shami79
刊名ASTROPHYSICAL JOURNAL
出版日期2023-12-01
卷号959期号:1
ISSN号0004-637X
DOI10.3847/1538-4357/acf4f2
产权排序第111完成单位
文献子类Article
英文摘要In 2017 the Event Horizon Telescope (EHT) observed the supermassive black hole at the center of the Milky Way, Sagittarius A* (Sgr A*), at a frequency of 228.1 GHz (lambda = 1.3 mm). The fundamental physics tests that even a single pulsar orbiting Sgr A* would enable motivate searching for pulsars in EHT data sets. The high observing frequency means that pulsars-which typically exhibit steep emission spectra-are expected to be very faint. However, it also negates pulse scattering, an effect that could hinder pulsar detections in the Galactic center. Additionally, magnetars or a secondary inverse Compton emission could be stronger at millimeter wavelengths than at lower frequencies. We present a search for pulsars close to Sgr A* using the data from the three most sensitive stations in the EHT 2017 campaign: the Atacama Large Millimeter/submillimeter Array, the Large Millimeter Telescope, and the IRAM 30 m Telescope. We apply three detection methods based on Fourier-domain analysis, the fast folding algorithm, and single-pulse searches targeting both pulsars and burst-like transient emission. We use the simultaneity of the observations to confirm potential candidates. No new pulsars or significant bursts were found. Being the first pulsar search ever carried out at such high radio frequencies, we detail our analysis methods and give a detailed estimation of the sensitivity of the search. We conclude that the EHT 2017 observations are only sensitive to a small fraction (less than or similar to 2.2%) of the pulsars that may exist close to Sgr A*, motivating further searches for fainter pulsars in the region.
学科主题天文学
URL标识查看原文
出版地TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND
WOS关键词GALACTIC-CENTER MAGNETAR ; SUPERMASSIVE BLACK-HOLE ; STAR-FORMATION HISTORY ; GENERAL-RELATIVITY ; RADIO OBSERVATIONS ; STELLAR DYNAMICS ; GRAVITY TESTS ; RESULTS. VI. ; DISCOVERY ; MILKY
资助项目N/A
WOS研究方向Astronomy & Astrophysics
语种英语
出版者IOP Publishing Ltd
WOS记录号WOS:001113867600001
资助机构N/A
版本出版稿
源URL[http://ir.ynao.ac.cn/handle/114a53/26447]  
专题星系类星体研究组
云南天文台_中国科学院天体结构与演化重点实验室
作者单位1.Massachusetts Institute of Technology Haystack Observatory, 99 Millstone Road, Westford, MA 01886, USA;
2.Bard College, 30 Campus Road, Annandale-on-Hudson, NY 12504, USA
3.Astronomy Department, University of Science and Technology of China, Hefei 230026, People's Republic of China;
4.School of Astronomy and Space Sciences, University of Chinese Academy of Sciences, No. 19A Yuquan Road, Beijing 100049, People's Republic of China;
5.Mullard Space Science Laboratory, University College London, Holmbury St. Mary, Dorking, Surrey RH5 6NT, UK;
6.School of Physics, Huazhong University of Science and Technology, Wuhan, Hubei 430074, People's Republic of China;
7.Princeton Gravity Initiative, Princeton University, Princeton, NJ 08544, USA;
8.Radboud Excellence Fellow of Radboud University, Nijmegen, The Netherlands;
9.Tuorla Observatory, Department of Physics and Astronomy, University of Turku, Finland;
10.Physics Department, Brandeis University, 415 South Street, Waltham, MA 02453, USA;
推荐引用方式
GB/T 7714		 Torne, Pablo,Liu, Kuo,Eatough, Ralph P.,et al. A Search for Pulsars around Sgr A* in the First Event Horizon Telescope Data Set[J]. ASTROPHYSICAL JOURNAL,2023,959(1).
APA Torne, Pablo.,Liu, Kuo.,Eatough, Ralph P..,Wongphechauxsorn, Jompoj.,Cordes, James M..,...&Zhao, Shan-Shan.(2023).A Search for Pulsars around Sgr A* in the First Event Horizon Telescope Data Set.ASTROPHYSICAL JOURNAL,959(1).
MLA Torne, Pablo,et al."A Search for Pulsars around Sgr A* in the First Event Horizon Telescope Data Set".ASTROPHYSICAL JOURNAL 959.1(2023).

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