High-resolution X-ray imaging of M33

Details High-resolution X-ray imaging of M33 High-resolution X-ray imaging of M33

Mar 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apj...441..568s&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 441, no. 2, p. 568-575

Astronomy and Astrophysics

Astronomy

39

H Ii Regions, Interstellar Matter, Spiral Galaxies, Supernova Remnants, X Ray Astronomy, X Ray Imagery, X Ray Sources, Data Reduction, Heao 2, Rosat Mission, Stellar Luminosity, Stellar Winds, Supernovae

Scientific paper

The nearby spiral galaxy M33 was observed for 35 ks with the high-resolution imager on ROSAT in 1992 January and August. We find 27 X-ray sources more luminous than 6 x 1036 ergs/s within 17.5 arcmin of the nucleus, of which 12 were discovered by the Einstein Observatory. Three of the ROSAT sources are coincident with giant H II regions, and seven are coincident or nearly coincident with supernova remnants. There is evidence for long-term variability between the Einstein and ROSAT observations in three sources, one of which was not detected in the ROSAT observations. Aside from an eclipsing binary X-ray source discovered by the Einstein Observatory, there is no evidence for variability within the ROSAT observations. Of the 120 cataloged holes in the H I layer in the field of view, two have significant X-ray emission. One is coincident with the giant H II region IC 133 while the other appears to be due to the chance superposition of a strong X-ray point source. Such holes are thought to be created by energetic stellar winds and supernovae from massive stars in young associations. We detect diffuse X-ray emission with a luminosity of about 1039 ergs/s, which may trace the spiral arms within 10 arcmin of the nucleus.

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