Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996rftu.proc..399v&link_type=abstract
International Conference on X-ray Astronomy and Astrophysics: Röntgenstrahlung from the Universe, p. 399 - 400
Astronomy and Astrophysics
Astrophysics
1
Spiral Galaxies: X-Ray Sources
Scientific paper
The inclined nearby (d = 9.7 Mpc) spiral galaxy NGC 4559 was observed with the ROSAT PSPC. Seventeen point sources were detected in a 15'×15' field, seven of which fall within the D25 ellipse of the galaxy. The most luminous source is associated with the nucleus of the galaxy, which has a luminosity of Lx = 7×1039erg s-1 and is slightly extended, suggesting a superposition of several compact sources or diffuse emission surrounding a compact central source. Another bright source (Lx = 6×1039erg s-1) was found in an outer spiral arm, coincident with a group of H II regions. Since little radio or infrared emission emerges from this location, the authors believe that the X-rays originate from a single, young supernova remnant that expands into a cloud with density of order 103cm-3. Diffuse, unresolved emission within the galaxy's bulge and inner disk was detected with a total X-ray luminosity of Lx = 1.3×1039erg s-1. No emission was detected from a possible halo. In the outer disk the authors detect a depression of soft X-rays that is likely caused by absorption of soft X-ray background radiation originating at further distance; the background surface brightness is estimated at Sx ⪆ 3×10-4cts s-1arcmin-2.
Bertoldi Frank
Pietsch Wolfgang
Vögler Alexander
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