Second ROSAT all-sky survey (2RXS) source catalogue
Th. Boller, M.J. Freyberg, J. Truemper, F. Haberl, W. Voges, K. Nandra

TL;DR
The 2RXS catalogue offers an extensive, improved, and more reliable compilation of X-ray sources from the ROSAT all-sky survey, including detailed spectral and variability information, serving as a valuable resource before eROSITA data.
Contribution
This paper introduces the second ROSAT all-sky survey source catalogue with enhanced detection algorithms, background modeling, and visual inspection, providing a more accurate and comprehensive X-ray source catalog.
Findings
Approximately 135,000 X-ray detections identified.
Expected spurious detections are about 30%.
Catalogue includes variability and spectral analysis.
Abstract
We present the second ROSAT all-sky survey source catalogue, hereafter referred to as the 2RXS catalogue. This is the second publicly released ROSAT catalogue of point-like sources obtained from the ROSAT all-sky survey (RASS) observations performed with the PSPC between June 1990 and August 1991, and is an extended and revised version of the bright and faint source catalogues. We used the latest version of the RASS processing to produce overlapping X-ray images of 6.4x6.4 degrees sky regions. To create a source catalogue, a likelihood-based detection algorithm was applied to these, which accounts for the PSF across the PSPC field of view. Improvements in the background determination compared to 1RXS were also implemented. We obtained about 135,000 X-ray detections in the 0.1-2.4 keV energy band down to a likelihood threshold of 6.5. Our simulations show that the expected spurious…
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