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Very Large Array Multiband Monitoring Observations of M31*
Yang, Yang1,2; Li, Zhiyuan1,2; Sjouwerman, Lorant O.3; Yuan, Feng4,5; Shen, Zhi-Qiang4,6
2017-08-20
Source PublicationASTROPHYSICAL JOURNAL
ISSN0004-637X
Volume845Issue:2Pages:9
Corresponding AuthorLi, Zhiyuan(lizy@nju.edu.cn)
AbstractThe Andromeda galaxy (M31) hosts one of the nearest and most quiescent supermassive black holes, which provides a rare, but promising opportunity for studying the physics of black hole accretion at the lowest state. We have conducted a multifrequency, multi-epoch observing campaign, using the Karl G. Jansky Very Large Array (VLA) in its extended configurations in 2011-2012, to advance our knowledge of the still poorly known radio properties of M31*. For the first time, we detect M31* at 10, 15, and 20 GHz and measure its spectral index, alpha approximate to -0.45 +/- 0.08 (S-nu alpha nu(alpha)), over the frequency range of 5-20 GHz. The relatively steep spectrum suggests that the observed radio flux is dominated by the optically thin part of a putative jet, which is located at no more than a few thousand Schwarzschild radii from the black hole. On the other hand, our sensitive radio images show little evidence for an extended component, perhaps except for several parsec-scale "plumes," the nature of which remains unclear. Our data also reveal significant (a few tens of percent) flux variation of M31* at 6 GHz, on timescales of hours to days. Furthermore, a curious decrease of the mean flux density, by similar to 50%, is found between VLA observations taken during 2002-2005 and our new observations, which might be associated with a substantial increase in the mean X-ray flux of M31* starting in 2006.
Keywordgalaxies: nuclei galaxies: individual (M31) radio continuum: galaxies
DOI10.3847/1538-4357/aa8265
WOS KeywordSUPERMASSIVE BLACK-HOLE ; ACTIVE GALACTIC NUCLEI ; SAGITTARIUS-A-ASTERISK ; X-RAY ; RADIO VARIABILITY ; NEARBY GALAXIES ; STIS SPECTROSCOPY ; M31 ; ACCRETION ; SPECTRUM
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000408111400026
PublisherIOP PUBLISHING LTD
Citation statistics
Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/22701
Collection中国科学院紫金山天文台
Corresponding AuthorLi, Zhiyuan
Affiliation1.Nanjing Univ, Sch Astron & Space Sci, Nanjing 210023, Jiangsu, Peoples R China
2.Nanjing Univ, Key Lab Modern Astron & Astrophys, Nanjing 210023, Jiangsu, Peoples R China
3.Natl Radio Astron Observ, Socorro, NM 87801 USA
4.Chinese Acad Sci, Shanghai Astron Observ, Shanghai 200030, Peoples R China
5.Chinese Acad Sci, Key Lab Res Galaxies & Cosmol, Beijing, Peoples R China
6.Chinese Acad Sci, Key Lab Radio Astron, Beijing, Peoples R China
Recommended Citation
GB/T 7714
Yang, Yang,Li, Zhiyuan,Sjouwerman, Lorant O.,et al. Very Large Array Multiband Monitoring Observations of M31*[J]. ASTROPHYSICAL JOURNAL,2017,845(2):9.
APA Yang, Yang,Li, Zhiyuan,Sjouwerman, Lorant O.,Yuan, Feng,&Shen, Zhi-Qiang.(2017).Very Large Array Multiband Monitoring Observations of M31*.ASTROPHYSICAL JOURNAL,845(2),9.
MLA Yang, Yang,et al."Very Large Array Multiband Monitoring Observations of M31*".ASTROPHYSICAL JOURNAL 845.2(2017):9.
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