Abstract
We present the first all-sky catalogue of galaxy clusters and cluster candidates obtained from joint X-ray-SZ detections using observations from the Planck satellite and the ROSAT all-sky survey (RASS). The catalogue contains 2323 objects and has been validated by careful cross-identification with previously known clusters. This validation shows that 1597 candidates correspond to already known clusters, 212 coincide with other cluster candidates still to be confirmed, and the remaining 514 are completely new detections. With respect to Planck catalogues, the ComPRASS catalogue is simultaneously more pure and more complete. Based on the validation results in the SPT and SDSS footprints, the expected purity of the catalogue is at least 84.5%, meaning that more than 365 clusters are expected to be found among the new or still-to-be-confirmed candidates with future validation efforts or specific follow-ups.
Highlights
Galaxy cluster catalogues with high purity and completeness are fundamental to study clusters both from an astrophysical and a cosmological perspective
Construction of the ComPRASS catalogue The ComPRASS catalogue was obtained by applying the X-ray–SZ joint detection method proposed in Tarrío et al (2018) to all-sky maps from the Planck and ROSAT All-Sky Survey (RASS) surveys
Comparison with MMF3 clusters Since the X-ray–SZ detection method was built as an extension of the MMF3 detection method, we expect it to have a better performance than that of its predecessor
Summary
Galaxy cluster catalogues with high purity and completeness are fundamental to study clusters both from an astrophysical and a cosmological perspective. Cluster catalogues have usually been constructed through single-survey data, each probing a different region of the electromagnetic spectrum This approach does not leverage the possible synergies that different sources of information might offer if a joint detection approach were used. We present ComPRASS, a Combined PlanckRASS catalogue of X-ray–SZ sources This all-sky catalogue contains 2323 galaxy cluster candidates and was constructed by applying the X-ray–SZ joint detection method proposed in Tarrío et al (2018) on all-sky maps from the Planck and RASS surveys. 2. Construction of the ComPRASS catalogue The ComPRASS catalogue was obtained by applying the X-ray–SZ joint detection method proposed in Tarrío et al (2018) to all-sky maps from the Planck and RASS surveys. As in Tarrío et al (2016) and Tarrío et al (2018), to make them directly compatible with the all-sky X-ray map mentioned above, we up-sampled them to a resolution of 0.86 arcmin pixel−1 by zero-padding in the spherical harmonics domain, that is, by adding new modes with zero power
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