A study of the low-frequency quasi-periodic oscillations in the X-ray light curves of the black hole candidate XTE J1859+226

被引:186
作者
Casella, P
Belloni, T
Homan, J
Stella, L
机构
[1] INAF, Osservatorio Astron Roma, I-00040 Monte Porzio Catone, Italy
[2] Univ Roma Tre, Dept Phys, I-00146 Rome, Italy
[3] INAF, Osservatorio Astron Brera, I-23807 Merate, LC, Italy
[4] MIT, Ctr Space Res, Cambridge, MA 02139 USA
关键词
X-rays : binaries; stars : individual : XTE J1859+226;
D O I
10.1051/0004-6361:20041231
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We present the results of an extensive timing analysis of the 1999 outburst of the soft X-ray transient and black hole candidate XTE J1859+226 as observed with the Rossi X-Ray Timing Explorer. Three main different types of low frequency (1-9 Hz) quasi-periodic oscillations (QPOs) were observed and classified, strengthening the general picture that is emerging for the variability properties of black hole X-ray binaires. Rapid transitions between different power spectral shapes were observed and their link with the count rate was studied. Furthermore, we show that a frequency of similar to6 Hz seems to hold a particular place: one of the three QPO types we found was very stable when at this frequency, as it happens in Z sources as well. The coherence of its subharmonic peak was higher when the fundamental was close to 6 Hz, thus suggesting the presence of some resonance at this frequency.
引用
收藏
页码:587 / 600
页数:14
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