X-RAY AND RADIO VARIABILITY OF M31*, THE ANDROMEDA GALAXY NUCLEAR SUPERMASSIVE BLACK HOLE

被引：36

作者：

Garcia, Michael R. ^{[1
]}

Hextall, Richard ^{[1
,2
]}

Baganoff, Frederick K. ^{[3
]}

Galache, Jose ^{[1
]}

Melia, Fulvio ^{[4
,5
]}

Murray, Stephen S. ^{[1
]}

Primini, F. A. ^{[1
]}

Sjouwerman, Lorant O. ^{[6
]}

Williams, Ben ^{[7
]}

机构：

[1] Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA

[2] Univ Southampton, Dept Phys, Southampton SO9 5NH, Hants, England

[3] MIT, Kavli Inst Astrophys & Space Res, Cambridge, MA 02138 USA

[4] Univ Arizona, Dept Phys, Program Appl Math, Tucson, AZ 85721 USA

[5] Univ Arizona, Steward Observ, Tucson, AZ 85721 USA

[6] Natl Radio Astron Observ, Socorro, NM 87801 USA

[7] Univ Washington, Dept Astron, Seattle, WA 98195 USA

来源：

ASTROPHYSICAL JOURNAL | 2010年 / 710卷 / 01期

关键词：

accretion; accretion disks; black hole physics; galaxies: individual (M31); galaxies: nuclei; HUBBLE-SPACE-TELESCOPE; SAGITTARIUS-A-ASTERISK; ADVECTION-DOMINATED ACCRETION; GALACTIC-CENTER; CENTRAL REGION; POINT SOURCES; XMM-NEWTON; CHANDRA OBSERVATIONS; UNRESOLVED EMISSION; M31; BULGE;

D O I：

10.1088/0004-637X/710/1/755

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We confirm our earlier tentative detection of M31* in X-rays and measure its light curve and spectrum. Observations in 2004-2005 find M31* rather quiescent in the X-ray and radio. However, X-ray observations in 2006-2007 show M31* to be highly variable at times. A separate variable X-ray source is found near P1, the brighter of the two optical nuclei. The apparent angular Bondi radius of M31* is the largest of any black hole and large enough to be well resolved with Chandra. The diffuse emission within this Bondi radius is found to have an X-ray temperature similar to 0.3 keV and density 0.1 cm(-3), indistinguishable from the hot gas in the surrounding regions of the bulge given the statistics allowed by the current observations. The X-ray source at the location of M31* is consistent with a point source and a power-law spectrum with energy slope 0.9 +/- 0.2. Our identification of this X-ray source with M31* is based solely on positional coincidence.

引用

页码：755 / 763

页数：9

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