Iron-line and continuum flux variations in the RXTE spectra of the black hole candidate XTE J1650-500

被引:47
作者
Rossi, S
Homan, J
Miller, JM
Belloni, T
机构
[1] Osserv Astron Brera, Merate, Italy
[2] Univ Milano Bicocca, I-20126 Milan, Italy
[3] MIT, Ctr Space Res, Cambridge, MA 02139 USA
[4] Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA
关键词
accretion; accretion discs; black hole physics; relativity; X-rays : individual : XTE J1650-500; X-rays : stars;
D O I
10.1111/j.1365-2966.2005.09069.x
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We present the results of spectral fits made to 57 pointed observations of the Galactic black hole candidate and X-ray transient XTE J1650-500, made with the Rossi X-ray Timing Explorer (RXTE) in 2001 when the source was in a transition from the hard state to the soft state. A strong and variable Fe K alpha emission line is detected in these spectra. The line flux varies in a non-linear way with the hard X-ray flux, in apparent contradiction to the predictions of simple disc reflection models. We observe a change in the overall trend that coincides with changes in the continuum X-ray spectrum and the fast X-ray variability. The Fe-line flux versus hard X-ray flux variations are consistent with the predictions of reflection models that consider high disc-ionization states and with a model that considers gravitational light-bending effects. Indications for an anticorrelation between the Fe-line flux and the hard X-ray flux in the spectrally hardest observations and weak variations in the Fe-line energy (as observed with XMM-Newton and BeppoSAX) slightly favour the light-bending interpretation.
引用
收藏
页码:763 / 768
页数:6
相关论文
共 38 条
[1]  
Arnaud KA, 1996, ASTR SOC P, V101, P17
[2]   X-ray reflection by photoionized accretion discs [J].
Ballantyne, DR ;
Rossi, RR ;
Fabian, AC .
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2001, 327 (01) :10-22
[3]   A two-component ionized reflection model of MCG-6-30-15 [J].
Ballantyne, DR ;
Vaughan, S ;
Fabian, AC .
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2003, 342 (01) :239-248
[4]   The response of the FeKα line to changes in the X-ray illumination of accretion discs [J].
Ballantyne, DR ;
Ross, RR .
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2002, 332 (04) :777-787
[5]   PHOTOELECTRIC ABSORPTION CROSS-SECTIONS WITH VARIABLE ABUNDANCES [J].
BALUCINSKACHURCH, M ;
MCCAMMON, D .
ASTROPHYSICAL JOURNAL, 1992, 400 (02) :699-700
[6]   On the origin of radio emission in the X-ray states of XTE J1650-500 during the 2001-2002 outburst [J].
Corbel, S ;
Fender, RP ;
Tomsick, JA ;
Tzioumis, AK ;
Tingay, S .
ASTROPHYSICAL JOURNAL, 2004, 617 (02) :1272-1283
[7]   A long hard look at MCG-6-30-15 with XMM-Newton [J].
Fabian, AC ;
Vaughan, S ;
Nandra, K ;
Iwasawa, K ;
Ballantyne, DR ;
Lee, JC ;
De Rosa, A ;
Turner, A ;
Young, AJ .
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2002, 335 (01) :L1-L5
[8]  
FABIAN AC, 2003, MNRAS, V340, P28
[9]   X-RAY REFLECTION FROM COLD MATTER IN ACTIVE GALACTIC NUCLEI AND X-RAY BINARIES [J].
GEORGE, IM ;
FABIAN, AC .
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 1991, 249 (02) :352-367
[10]  
Gruber DE, 1996, ASTRON ASTROPHYS SUP, V120, pC641