RXTE Spectral Study of the New X-ray Transient XTE J1859+226

Details RXTE Spectral Study of the New X-ray Transient XTE J1859+226 RXTE Spectral Study of the New X-ray Transient XTE J1859+226

Dec 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aas...19512602f&link_type=abstract

American Astronomical Society, 195th AAS Meeting, #126.02; Bulletin of the American Astronomical Society, Vol. 31, p.1555

Astronomy and Astrophysics

Astronomy

Scientific paper

The transient galactic black hole candidate XTE J1859+226 was discovered by the RXTE All Sky Monitor (ASM) on 1999 October 9, within a day after its outburst began. Pointed observations with RXTE began on 1999 October 10.57, and continued at a rate of about twice per day. Preliminary results of fits to PCA and HEXTE spectra for October 9--14 show that a simple absorbed powerlaw is insufficient to model the data. The fit is greatly improved by using an absorbed cutoff powerlaw with reflection. The photon index rose from 1.8 on October 9 to 3.2 on October 14. The cutoff energy started near 100 keV, dropped to 50 keV, then rose to an undetectable level between October 12.86 and October 13.11, potentially indicating a state change. We will present spectral analysis of these and later data, along with comparison of the spectral and timing properties. This work was funded by NASA.

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