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A Deep X-Ray Image of M33
A 50.4 ks ROSAT Position Sensitive Proportional Counter image of thenearby spiral galaxy M33 reveals 37 sources within 15' of the nucleusbrighter than 7 x 10^35^ ergs s^-1^. There are at least 13 additionalsources farther from the nucleus, most of which are likely to beassociated with M33 as well. Most of the bright sources that had beendetected with Einstein in the same region are still visible. The bulk ofthe sources in the galaxy are associated with Population I tracers.Several of the sources are time variable. There are 10 sources in theimage that lie within 20" of optically identified supernova remnants(SNRs) in M33. The spectra of these sources are soft compared with mostother sources of comparable brightness, and therefore it is likely thatmost of these X-ray sources are SNRs. Based on the identification ofsources in M33, it appears likely that ROSAT hardness ratios of thistype can be used to separate SNRs and compact sources in other nearbynormal galaxies as well. The northern and the southern spiral arms ofM33 appear as diffuse features in the X-ray image. There is additionaldiffuse (or unresolved source) emission throughout the inner portions ofM33. The diffuse emission is softer than the faint point sources and theSNRs in the survey, and is well fitted in terms of a bremsstrahlungspectrum with kT ~ 0.4 keV and log N_H_ ~ 20.6.
| Photographic magnitudes of stars brighter than 7m.75 between +75° and +80° declination (Errata: 11 270)
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| Yerkes actinometry. Zone +73deg to +90deg.
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