Long-term spectral and timing behavior of black hole candidate XTE J1908+094
Göğüş, Ersin and Finger, Mark H. and Kouveliotou, Chryssa and Woods, Peter M. and Patel, Sandeep K. and Rupen, Michael and Swank, Jean H. and Markwardt, Craig B. and Van Der Klis, Michiel (2004) Long-term spectral and timing behavior of black hole candidate XTE J1908+094. The Astrophysical journal, 609 (2). pp. 977-987. ISSN 0004-637X
Official URL: http://dx.doi.org/10.1086/421255
We present the long-term X-ray light curves and detailed spectral and timing analyses of XTE J1908+094 using the Rossi X-Ray Timing Explorer Proportional Counter Array observations covering two outbursts in 2002 and early 2003. At the onset of the first outburst, the source was found in a spectrally low/hard state lasting for 40 days, followed by a 3 day long transition to the high/soft state. The source flux (in 210 keV) reached 100 mcrab on 2002 April 6, then decayed rapidly. In power spectra, we detect strong band-limited noise and varying low-frequency quasi-periodic oscillations that evolved from 0.5 to 5 Hz during the initial low/hard state of the source. We find that the second outburst closely resembled the spectral evolution of the first. The X-ray transient's overall outburst characteristics led us to classify XTE J1908+094 as a black hole candidate. Here we also derive precise X-ray position of the source using Chandra observations that were performed during the decay phase of the first outburst and following the second outburst.
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