Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aj....116.1657m&link_type=abstract
The Astronomical Journal, Volume 116, Issue 4, pp. 1657-1670.
Astronomy and Astrophysics
Astronomy
11
Galaxies: Individual: Ngc Number: Ngc 1313, Galaxies: Spiral, Stars: Supernovae: Individual: Alphanumeric: Sn 1978K, X-Rays: Galaxies
Scientific paper
Second-epoch ROSAT PSPC observations of the nearby barred spiral galaxy NGC 1313 show that the extended X-ray emission surrounding the bright ``nuclear'' source can be mostly attributed to at least three individual sources, each with L_X(0.1-2.4keV) ~ 10^38-39 ergs s^-1 and lying within ~2.6 kpc from the central source. One of these three sources shows up only as an extension of the nuclear source in the east-west direction but becomes more apparent after subtracting out the main source. We find no evidence for X-ray emission from hot, interstellar gas and show that if such emission is present, it has a surface brightness <=5 x 10^36 ergs s^-1 arcmin^-2 and an integrated X-ray luminosity less than ~5 x 10^38 ergs s^-1. We find that of the 10 point sources detected, four of them show definite signs of variability between the two epochs of PSPC data. We also discuss an attempted revision of the description of the point-spread function of the PSPC.
Colbert Edward
Miller Scott
Petre Robert
Schlegel Eric M.
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