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A Chandra Observation of the Nearby Sculptor Group Sd Galaxy NGC 7793

Published online by Cambridge University Press:  12 May 2006

Thomas G. Pannuti ,
Eric M. Schlegel  and
Christina K. Lacey
Thomas G. Pannuti
Affiliation:
Spitzer Science Center, California Institute of Technology, Mailstop 220-6, Pasadena, CA 91101, USA email: tpannuti@ipac.caltech.edu
Eric M. Schlegel
Affiliation:
Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138 USA email: eschlegel@cfa.harvard.edu
Christina K. Lacey
Affiliation:
Department of Physics, University of South Carolina, Columbia, SC 29208 USA email: lacey@sc.edu
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Abstract

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We present the results of a Chandra observation made of the nearby spiral galaxy NGC 7793: the effective exposure time of this observation was 49094 seconds. Twenty-two discrete sources were identified at a minimum of a 3$\sigma$ level to an estimated limiting luminosity of ∼$2\times10^{36}$ ergs sec$^{-1}$. We have performed a spectral analysis of the known ultraluminous X-ray source (ULX) in this galaxy: statistically-acceptable fits to the spectrum can be obtained with either a power law model, a bremsstrahlung model or a DISKBB model. We have also searched for counterparts at multiple wavelengths to these sources: based on this search, we have classified two supernova remnants, one HII region and two foreground stars.

Keywords

X-rays: galaxiesgalaxies: individual (NGC 7793)
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 1 , Symposium S230: Populations of High Energy Sources in Galaxies , August 2005 , pp. 197 - 198
Copyright
2006 International Astronomical Union