Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...330..672f&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 330, July 15, 1988, p. 672-683.
Astronomy and Astrophysics
Astrophysics
139
Galactic Structure, Star Formation, Starburst Galaxies, X Ray Spectra, Brightness Distribution, Galactic Nuclei, Heao 2, Proportional Counters, Spectrum Analysis
Scientific paper
The results of Einstein Observatory IPC X-ray observations of the well-known nearby starburst galaxies NGC 253 and M82 are presented. The major axis X-ray surface brightness profile of NGC 253 is steeper than the optical profile, but follows the radio continuum distribution closely. Extended X-ray emission with no optical or radio counterpart is found on the northern side of this galaxy. It is suggested that this emission may be due to gaseous clouds ejected from the starburst nucleus. The X-ray halo of M82 extends as far as 9 arcmin away from the nucleus along the minor axis. The radial distribution of the X-ray surface brightness of this halo is steep and suggests a density distribution proportional to 1/r-squared, typical of free-flowing winds. The spectral properties of the nuclear regions are different from those of the surrounding emission. They are fitted with large intrinsic absorption columns and possibly lower emission temperatures.
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