Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aas...195.7005s&link_type=abstract
American Astronomical Society, 195th AAS Meeting, #70.05; Bulletin of the American Astronomical Society, Vol. 31, p.1472
Astronomy and Astrophysics
Astrophysics
Scientific paper
We describe a series of observations of NGC 1313 using the ROSAT HRI with a combined exposure time of 183.5 ksec. The observations span an interval between 1992 and 1998; the purpose of observations since 1994 was to monitor the X-ray flux of SN1978K, one of several luminous sources in the galaxy. No diffuse emission is detected in the galaxy to a level of 7x1036 ergs s-1 arcmin-2. A total of eight sources are detected in the summed image within the D25 diameter of the galaxy and an additional seven outside of that region. We present light curves of the five brightest sources. Variability is detected at the 99.9% level from four of these. We identify one of the sources as an NGC 1313 counterpart of a Galactic X-ray source. The light curve, though crudely sampled, most closely resembles that of a Galactic black hole candidate such as GX339-4, but with considerably higher peak X-ray luminosity. We briefly discuss the large number of super-Eddington sources in this galaxy. The research was supported by NASA Grant NAG5-4015 to the Smithsonian Astrophysical Observatory.
Colbert Edward James McBride
Miller Samantha
Petre Rob
Schlegel Eric M.
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