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journal id: "astrophysicalxjournal"
| Authors | J. Homan, J.M. Miller, R. Wijnands, M. van der Klis, T. Belloni, D. Steeghs, W.H.G. Lewin | | Title | High- and Low-Frequency Quasi-periodic Oscillations in the X-Ray Light Curves of the Black Hole Transient H1743-322 |
| Journal | Astrophysical Journal |
| Volume | 623 |
| Year | 2005 |
| Pages | 383-391 |
| ISSN | 0004637X |
| Faculty | Faculty of Science |
| Institute/dept. | FNWI: Astronomical Institute Anton Pannekoek (IAP) |
| Abstract | We present a variability study of the black hole candidate and X-ray transient H1743-322 during its 2003-2004 outburst. We analyzed five Rossi X-Ray Timing Explorer observations that were performed as part of a multiwavelength campaign, as well as six observations from the early rise of the outburst. The source was observed in several black hole states and showed various types of X-ray variability, including high-frequency quasi-periodic oscillations (QPOs) at 240 and 160 Hz (i.e., with a 3:2 frequency ratio), several types of low-frequency QPOs, and strong variations on a timescale of a few hundred seconds. The discovery of high-frequency QPOs in H1743-322 supports predictions that these QPOs should be more easily observed in high inclination systems. In one of our observations a transition in count rate and color occurred, during which we were able to follow the smooth evolution of the low-frequency QPOs from type B to type A. We classify the X-ray observations and QPOs and briefly discuss the QPOs in terms of recently proposed models. |
| Document type | Article |
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