MAXI GSC observations of a spectral state transition in the black hole candidate XTE J1752-223-猫眼课题宝

DOI：

10.1093/pasj/62.5.l27

发表时间：

2010-07

期刊：

arXiv: High Energy Astrophysical Phenomena

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其他

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作者：

S. Nakahira;K. Yamaoka;M. Sugizaki;Y. Ueda;H. Negoro;K. Ebisawa;N. Kawai;M. Matsuoka;H. Tsunemi;A. Daikyuji;S. Eguchi;K. Hiroi;M. Ishikawa;R. Ishiwata;N. Isobe;K. Kawasaki;M. Kimura;M. Kohama;T. Mihara;S. Miyoshi;M. Morii;Y. Nakagawa;M. Nakajima;H. Ozawa;T. Sootome;K. Sugimori;Motoko Suzuki;H. Tomida;S. Ueno;Takayuki Yamamoto;A. Yoshida;Maxi Team

We present the first results on the black hole candidate XTE J1752-223 from the Gas Slit Camera (GSC) on-board the Monitor of All-sky X-ray Image (MAXI) on the International Space Station. Including the onset of the outburst reported by the Proportional Counter Array on-board the Rossi X-ray Timing Explorer on 2009 October 23, the MAXI/GSC has been monitoring this source approximately 10 times per day with a high sensitivity in the 2-20 keV band. XTE J1752-223 was initially in the low/hard state during the first 3 months. An anti-correlated behavior between the 2-4 keV and 4-20 keV bands were observed around January 20, 2010, indicating that the source exhibited the spectral transition to the high/soft state. A transient radio jet may have been ejected when the source was in the intermediate state where the spectrum was roughly explained by a power-law with a photon index of 2.5-3.0. The unusually long period in the initial low/hard state implies a slow variation in the mass accretion rate, and the dramatic soft X-ray increase may be explained by a sudden appearance of the accretion disk component with a relatively low innermost temperature (0.4-0.7 keV). Such a low temperature might suggest that the maximum accretion rate was just above the critical gas evaporation rate required for the state transition.

MAXI GSC observations of a spectral state transition in the black hole candidate XTE J1752-223

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