The energy-dependent temporal variation of the ROSAT PSPC gain

The second ROSAT PSPC survey of M31 and the complete ROSAT PSPC source list

This paper reports the results of the analysis of the second ROSAT PSPC survey of M31 performed in summer 1992. We compare our results with those of the first survey, already published in Supper et al. (1997). Within the ∼ 10.7 deg field of view, 396 individual X-ray sources are detected in the second survey data, of which 164 are new detections. When combined with the first survey, this result...

New SSS from the ROSAT PSPC

We have performed Chandra observations during the past 3 years of 5 of the M31 supersoft X-ray sources discovered with ROSAT. Surprisingly, only one of these sources has been detected, despite a predicted detection of about 20-80 counts for these sources. This has motivated a thorough check of the ROSAT M31 survey I data, including a relaxation of the hardness ratio requirement used to select s...

Table 1. ROSAT PSPC Pointings.

Re - analysis of ROSAT - PSPC X -

We carefully reanalyze the ROSAT PSPC X-ray spectro-photometric observations of HCG 16 (Arp 318) and compare them to optical and radio data. We detect diffuse emission in six regions filling half of the 8 radius circle around the optical center of the group: one region encompassing galaxies a & b, two regions surrounding the group galaxies c & d, one associated with a background radio-source, o...

ROSAT PSPC / HRI observations of the open cluster NGC 2422

We present the results of a ROSAT study of NGC 2422, a southern open cluster at a distance of about 470 pc, with an age close to the Pleiades. Source detection was performed on two observations, a 10-ksec PSPC and a 40-ksec HRI pointing, with a detection algorithm based on wavelet transforms, particularly suited to detecting faint sources in crowded elds. We have detected 78 sources, 13 of whic...