Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007pasj...59..531h&link_type=abstract
Publications of the Astronomical Society of Japan, Vol.59, No.3, pp.531-540
Astronomy and Astrophysics
Astronomy
Galaxies: Individual (Ngc 1808), Galaxies: Starburst, X-Rays: Galaxies
Scientific paper
We analyzed discrete sources in a typical starburst galaxy, NGC 1808, with Chandra in order to study the relation between X-ray and star-forming activities. We detected thirty-eight X-ray sources with an X-ray luminosity (LX) of > 1037 erg s-1 in the central 5' × 5' (13.4 kpc × 13.4 kpc) region. About 90% of the hard X-rays previously detected with ASCA came from these discrete sources. Among the detected sources, sixteen sources had an LX of > 1038 erg s-1. The number of luminous sources is nearly equal to that of M 82, although their concentration into the central star-forming region is lower than that of M 82. There are several soft X-ray sources with a temperature of 0.6 keV in the central star-forming region. The X-ray properties of the soft sources are similar to those of a H II region, or a supernova remnant. The existence of both luminous sources and soft X-ray sources indicates the star-forming activity of NGC 1808. However, we detected only a few candidates of high-mass X-ray binaries that would be produced by enhanced star-forming activity. This may be due to the starburst age of NGC 1808.
Awaki Hisamitsu
Heike Kazunori
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