VizieR Online Data Catalog: Properties of brightest cluster galaxies (De Propris+, 2021)
Abstract
Our first cluster sample is taken from Andrade-Santos et al. (2017ApJ...843...76A, Cat. J/ApJ/843/76), which consists of 164 clusters in the Planck Early Sunyaev-Zel'dovich sample with z=<0.35 plus a flux-limited X-ray sample of 100 clusters with z=<0.30, with some overlap. All have Chandra observations obtained as part of the Chandra-Planck Legacy Program for Massive Clusters of Galaxies (https://hea-www.harvard.edu/CHANDRAPLANCKCLUSTERS), with exposures that yield at least 10000 source counts. Optical imaging is provided by data from the Panoramic Survey Telescope and Rapid Response System (Pan-STARRS) survey (Chambers et al. 2016arXiv161205560C) to identify and measure the properties of BCGs. We choose the BCG as the brightest galaxy from the Pan-STARRS stacked image over a 3Mpc region centred on the X-ray peak. In general, BCGs have distinctive appearances, dominant ellipticals often surrounded by extended haloes of diffuse starlight, so identification is usually unambiguous. In cases of merging clusters or subclusters, we opted to use only the primary component in order to focus on the most massive systems. We refer to this sample as the X-ray-selected cluster sample.
Because BCGs can be offset from the cluster centre in position and/or velocity space, we compiled a second cluster sample by selecting all clusters with 50 or more member galaxies based on available velocities in NED. The sample is heterogeneous but contains mainly Abell clusters plus some systems from the HeCS survey (Rines et al. 2016ApJ...819...63R, Cat. J/ApJ/819/63, 2018ApJ...862..172R, Cat. J/ApJ/862/172) not present in the Abell catalogue. This sample selection does not depend on X-ray emission, providing an independent check of BCG alignments when the galaxy is not at rest relative to the gravitational potential (e.g. see Martel et al. 2014ApJ...786...79M). As we require 50 or more spectroscopic redshifts per cluster, these are likely to be comparatively massive systems. We refer to this sample as the velocity-selected cluster sample. (1 data file).- Publication:
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VizieR Online Data Catalog
- Pub Date:
- September 2023
- Bibcode:
- 2023yCat..75000310D
- Keywords:
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- Clusters: galaxy;
- Galaxies;
- Redshifts;
- Velocity dispersion;
- X-ray sources;
- Optical