Astronomy and Astrophysics – Astronomy
Scientific paper
May 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aas...198.0806k&link_type=abstract
American Astronomical Society, 198th AAS Meeting, #08.06; Bulletin of the American Astronomical Society, Vol. 33, p.797
Astronomy and Astrophysics
Astronomy
Scientific paper
Spiral galaxies are complex X-ray sources. There is evidence for diffuse emission from hot gas, but it is a multitude of discrete sources which dominate the total flux. The discrete source population is thought to arise from X-ray luminous supernova remnants and X-ray binaries; however, pre-Chandra observations suffered from poor resolution, making it impossible to distinguish between these possibilities. Here we present X-ray and optical observations of the nearby (8.6 Mpc) face-on spiral galaxy NGC 3184. NGC 3184 does not have any evidence for an AGN; the nuclear region has an HII region spectrum. It was observed twice with Chandra, in Jan and Feb 2000. We show that at least 1/3 of the discrete sources are variable, suggesting that they are accretion sources. Approximately 1/3 of the X-ray sources are coincident with an optical source, mostly HII regions. Finally, we show that there is no evidence for dramatic variations of the X-ray hardness ratio as a function of distance from the nucleus, perhaps suggesting that the binary production rate is in steady state in this disk galaxy.
Kaaret Phil
Kilgard Roy
Krauss Markus
McDowell Jonathan
Prestwich Andrea
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