Einstein observations of the confused 2A 2315 - 428 region

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Abstract
We report an observation of the 2A2315 – 428 field with the Einstein Observatory imaging proportional counter which revealed four distinct X-ray sources. By far the strongest in this energy band (0.2–3.8 keV) is associated with the rich cluster Sérsi 159-03 which contains a cD galaxy. This source may account for as much as 40 per cent of the observed 2A flux, the remainder of which is almost certainly produced by the much weaker, but more heavily cut-off galaxy NGC 7582. We suggest that the presence of such a large X-ray absorption column density in NGC 7582 may also account for the absence of a broad component of Hα emission, a correlation that is observed in several other narrow-line X-ray galaxies. We also detect a weak X-ray flux from NGC 7552 and reanalyse previous observations to show that this source is not variable. The X-ray emission is unlikely to be due to a compact nucleus and we suggest that it is a ‘starburst’ galaxy. The remaining X-ray source is unidentified.

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