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
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
收藏
页码:755 / 763
页数:9
相关论文
共 61 条
  • [11] The origin of the young stars in the nucleus of M31
    Chang, Philip
    Murray-Clay, Ruth
    Chiang, Eugene
    Quataert, Eliot
    [J]. ASTROPHYSICAL JOURNAL, 2007, 668 (01) : 236 - 244
  • [12] DETECTION OF AN UNRESOLVED NUCLEAR RADIO-SOURCE IN M31 (VOL 390, PG L 9,199 2)
    CRANE, PC
    DICKEL, JR
    COWAN, JJ
    [J]. ASTROPHYSICAL JOURNAL, 1993, 411 (02) : L107 - L107
  • [13] The hot stars in orbit around the M31 central supermassive black hole: are they young or old?
    Demarque, P.
    Virani, S.
    [J]. ASTRONOMY & ASTROPHYSICS, 2007, 461 (02) : 651 - 656
  • [14] Supersoft X-ray sources in M31.: I.: A Chandra survey and an extension to quasi-soft sources
    Di Stefano, R
    Kong, AKH
    Greiner, J
    Primini, FA
    Garcia, MR
    Barmby, P
    Massey, P
    Hodge, PW
    Williams, BF
    Murray, SS
    Curry, S
    Russo, TA
    [J]. ASTROPHYSICAL JOURNAL, 2004, 610 (01) : 247 - 260
  • [15] DOSAJ A, 2001, BAAS, V33, P1369
  • [16] DOSAJ A, 2002, ASP C SER, V262, P147
  • [17] An extensive census of Hubble Space Telescope counterparts to Chandra X-ray sources in the globular cluster 47 Tucanae.: I.: Astrometry and photometry
    Edmonds, PD
    Gilliland, RL
    Heinke, CO
    Grindlay, JE
    [J]. ASTROPHYSICAL JOURNAL, 2003, 596 (02) : 1177 - 1196
  • [18] Falcke H, 2000, ASTRON ASTROPHYS, V362, P113
  • [19] Star Formation at the Galactic Center
    Fatuzzo, Marco
    Melia, Fulvio
    [J]. PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF THE PACIFIC, 2009, 121 (880) : 585 - 590
  • [20] A possible detection of M31* with Chandra
    Garcia, MR
    Williams, BF
    Yuan, F
    Kong, AKH
    Primini, FA
    Barmby, P
    Kaaret, P
    Murray, SS
    [J]. ASTROPHYSICAL JOURNAL, 2005, 632 (02) : 1042 - 1047