Mathematics – Logic
Scientific paper
Dec 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aas...19111103m&link_type=abstract
American Astronomical Society, 191st AAS Meeting, #111.03; Bulletin of the American Astronomical Society, Vol. 29, p.1390
Mathematics
Logic
Scientific paper
The source GRS 1915+105 is one of two recently-discovered galactic sources which have been shown to produce superluminal outflows observable in radio. It has been observed extensively in X-rays by RXTE, and can be extremely variable, with flux changing by factors of 2--3 on timescales as short as several seconds. We have determined the short-timescale evolution of the photon energy spectrum and power spectral density in 2--8 second increments. The energy spectrum is fit satisfactorily by a power law plus a ``disk'' black body model. The spectral parameters also show dramatic and sudden variations in time, and we present a possible physical interpretation in the context of an unstable accretion disk and corona. The spectral and temporal evidence suggests that the complicated variability that is observed may be comprised of sequences of as few as three distinct phenomenological states.
Chen Xingming
Markwardt Craig
Swank Jean
Taam Ronald
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