1995PASP..107..561E

Based on Einstein IPC imaging and spectroscopy, optical spectroscopy and optical imaging, I argue that the x-rays seen in the direction of the Local Group dwarf irregular galaxy IC 1613 are mainly due to emission from a previously uncataloged cluster of galaxies (CL B0102+0146) at a redshift of z ∼ 0.2 and of richness class ∼3, centered at the IPC x-ray position. The Einstein data are not adequate to determine if the x-rays are due to cluster emission or an AGN. However, both the available optical data, and the non-detection of this object in deep radio surveys argue that a hote intracluster medium is the source of the x-ray emission. The x-ray flux of this cluster in the Einstein IPC band (0.2-4.0 keV) is higher than 78% of the clusters in the Einstein Extended Medium Sensitivity Survey sample of Gioia et al. (1990). It is thus likely that only its position behind IC 1613 prevented its earlier detection.