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X-Ray Nova XTE J1550−564: [ITAL]RXTE[/ITAL] Spectral Observations

1999; IOP Publishing; Volume: 517; Issue: 2 Linguagem: Inglês

10.1086/312037

1538-4357

Gregory J. Sobczak, Jeffrey E. McClintock, Ronald A. Remillard, Alan M. Levine, E. Morgan, C. D. Bailyn, Jerome A. Orosz,

Mechanics and Biomechanics Studies

Excellent coverage of the 1998 outburst of the X-ray nova XTE J1550-564 was provided by the Rossi X-Ray Timing Explorer (RXTE). XTE J1550-564 exhibited an intense (6.8 crab) flare on 1998 September 19 (UT), making it the brightest new X-ray source observed with RXTE. We present a spectral analysis utilizing 60 Proportional Counter Array spectra from 2.5-20 keV spanning 71 days and a nearly continuous All Sky Monitor light curve. The spectra were fitted to a model including multicolor blackbody disk and power-law components. XTE J1550-564 is observed in the very high, high/soft, and intermediate canonical outburst states of black hole X-ray novae.