Other
Scientific paper
Sep 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011head...12.4402s&link_type=abstract
American Astronomical Society, HEAD meeting #12, #44.02
Other
Scientific paper
We use data from twice-weekly scans of the Galactic bulge by the Rossi X-ray Timing Explorer (RXTE) to study fast x-ray transients, including Supergiant Fast X-ray Transients (SFXTs). Using up to 11 years of data at this cadence for some sources, we explore the duty cycle of activity in these sources and the timescales of correlation; lack of correlation on timescales of a week or more is characteristic of the SFXTs but not other classes of x-ray binary. We confirm the orbital periods reported by other groups for SFXTs SAX J1818.6-1703 and IGR J17544-2619, but not for XTE J1739-302. The bulge source XTE J1743-363 remains a mystery, showing a combination of fast variability and a long-term decline in activity. Using a spectrum of the companion taken with the Andalucia Faint Object Spectrograph and Camera (ALFOSC) on the Nordic Optical Telescope in La Palma, Spain, we suggest that this system may be a symbiotic neutron star binary rather than an SFXT.
Markwardt Craig B.
Negueruela Ignacio
Smith Masson D.
Swank Jean H.
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