A transient variable 6 Hz QPO from GX 339-4

被引:64
作者
Nespoli, E
Belloni, T
Homan, J
Miller, JM
Lewin, WHG
Méndez, M
van der Klis, M
机构
[1] Osserv Astron Brera, INAF, I-23807 Merate, LC, Italy
[2] Univ Milan, I-20133 Milan, Italy
[3] Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA
[4] MIT, Ctr Space Res, Cambridge, MA 02139 USA
[5] SRON, Natl Inst Space Res, NL-3584 CA Utrecht, Netherlands
[6] Univ Amsterdam, Astron Inst Anton Pannekoek, NL-1098 SJ Amsterdam, Netherlands
[7] Natl Inst Nucl & High Energy Phys, Ctr High Energy Astrophys, NL-1098 SJ Amsterdam, Netherlands
关键词
accretion : accretion disks; black hole physics; stars : oscillations; X-rays : stars;
D O I
10.1051/0004-6361:20031423
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We report the results of an observation with the Rossi X-ray Timing Explorer of the black hole candidate GX 339-4 during its 2002/2003 outburst. This observation took place during a spectral transition from the hard to the soft state. A strong (6% rms) transient quasi-periodic oscillation (QPO) appears suddenly in the power density spectrum during this observation. The QPO centroid is similar to6 Hz, but it varies significantly between 5 and 7 Hz with a characteristic time scale of similar to10 s, correlated with the 2-30 keV count rate. The appearance of the QPO is related to spectral hardening of the flux, due to a change in the relative contribution of the soft and hard spectral components. We compare this peculiar behavior with results from other systems that show similar low frequency QPO peaks, and discuss the results in terms of possible theoretical models for QPO production.
引用
收藏
页码:235 / 240
页数:6
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