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A Deep Chandra View of a Candidate Parsec-scale Jet from the Galactic Center Supermassive Black Hole
Zhu, Zhenlin1,2; Li, Zhiyuan1,2; Morris, Mark R.3; Zhang, Shuo4; Liu, Siming5
2019-04-10
Source PublicationASTROPHYSICAL JOURNAL
ISSN0004-637X
Volume875Issue:1Pages:12
Corresponding AuthorZhu, Zhenlin(zhuzl@smail.nju.edu.cn)
AbstractWe have investigated the linear X-ray filament, G359.944-0.052, previously identified as a likely X-ray counterpart of a parsec-scale jet from the Galactic Center supermassive black hole (SMBH) Sagittarius A* (Sgr A*), using a total of similar to 5.6 Ms ultra-deep Chandra observations taken from 1999 September to 2017 July. This unprecedented data set enables us to examine flux and spectral variations that might be related to intrinsic properties of the weakly accreting SMBH. We find no flux or spectral variation in G359.944-0.052 after the G2 periapsis passage around early 2014; however, a moderate flux increase of similar to 2 sigma significance might be associated with the periapsis passage of G1 in early 2001. The filament exhibits an unusually hard spectrum (photon index less than or similar to 1) in its portion closest to Sgr A* (i.e., near side) and a significant spectral softening in the more distant portion, which can be interpreted as synchrotron cooling of the relativistic electrons moving along the jet path. In particular, the hard spectrum of the near side suggests a piling up of quasi-monoenergetic electrons caused by rapid radiative cooling. The spectral and temporal properties of G359.944-0.052 strengthen the case for it being the X-ray counterpart of a jet launched by Sgr A*.
Keywordblack hole physics Galaxy: center ISM: jets and outflows radiation mechanisms: non-thermal X-rays: individual (G359.944-0.052)
DOI10.3847/1538-4357/ab0e05
WOS KeywordX-RAY FLARE ; SGR A-ASTERISK ; SYSTEMATIC CHANDRA ; IONIZED-GAS ; XMM-NEWTON ; SAGITTARIUS ; RADIO ; MODEL ; CATALOG ; A(STAR)
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000464452400009
PublisherIOP PUBLISHING LTD
Citation statistics
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/24612
Collection中国科学院紫金山天文台
Corresponding AuthorZhu, Zhenlin
Affiliation1.Nanjing Univ, Sch Astron & Space Sci, Nanjing 210023, Jiangsu, Peoples R China
2.Nanjing Univ, Key Lab Modern Astron & Astrophys, Minist Educ, Nanjing 210023, Jiangsu, Peoples R China
3.Univ Calif Los Angeles, Dept Phys & Astron, Los Angeles, CA 90095 USA
4.MIT, Kavli Inst Astrophys & Space Res, 77 Massachusetts Ave, Cambridge, MA 02139 USA
5.Chinese Acad Sci, Purple Mt Observ, Nanjing 210034, Jiangsu, Peoples R China
Recommended Citation
GB/T 7714
Zhu, Zhenlin,Li, Zhiyuan,Morris, Mark R.,et al. A Deep Chandra View of a Candidate Parsec-scale Jet from the Galactic Center Supermassive Black Hole[J]. ASTROPHYSICAL JOURNAL,2019,875(1):12.
APA Zhu, Zhenlin,Li, Zhiyuan,Morris, Mark R.,Zhang, Shuo,&Liu, Siming.(2019).A Deep Chandra View of a Candidate Parsec-scale Jet from the Galactic Center Supermassive Black Hole.ASTROPHYSICAL JOURNAL,875(1),12.
MLA Zhu, Zhenlin,et al."A Deep Chandra View of a Candidate Parsec-scale Jet from the Galactic Center Supermassive Black Hole".ASTROPHYSICAL JOURNAL 875.1(2019):12.
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