Abstract
We present the brightest cluster galaxies (BCGs) catalog for SPectroscoic IDentification of eROSITA Sources (SPIDERS) DR14 cluster program value-added catalog. We list the 416 BCGs identified as part of this process, along with their stellar mass, star formation rates (SFRs), and morphological properties. We identified the BCGs based on the available spectroscopic data from SPIDERS and photometric data from SDSS. We computed stellar masses and SFRs of the BCGs on the basis of SDSS, WISE, and GALEX photometry using spectral energy distribution fitting. Morphological properties for all BCGs were derived by Sersic profile fitting using the software package SIGMA in different optical bands (g,r,i). We combined this catalog with the BCGs of galaxy groups and clusters extracted from the deeper AEGIS, CDFS, COSMOS, XMM-CFHTLS, and XMM-XXL surveys to study the stellar mass–halo mass relation using the largest sample of X-ray groups and clusters known to date. This result suggests that the mass growth of the central galaxy is controlled by the hierarchical mass growth of the host halo. We find a strong correlation between the stellar mass of BCGs and the mass of their host halos. This relation shows no evolution since z ∼ 0.65. We measure a mean scatter of 0.21 and 0.25 for the stellar mass of BCGs in a given halo mass at low (0.1 < z < 0.3) and high (0.3 < z < 0.65) redshifts, respectively. We further demonstrate that the BCG mass is covariant with the richness of the host halos in the very X-ray luminous systems. We also find evidence that part of the scatter between X-ray luminosity and richness can be reduced by considering stellar mass as an additional variable.
Highlights
The brightest cluster galaxies (BCGs) are the most luminous galaxies among the member galaxies in a cluster
We combined this catalog with the BCGs of galaxy groups and clusters extracted from the deeper All-wavelength Extended Groth strip International Survey (AEGIS), CDFS, Cosmological Evolution Survey (COSMOS), XMM-CFHTLS, and XMM-XXL surveys to study the stellar mass–halo mass relation using the largest sample of X-ray groups and clusters known to date
This result suggests that the mass growth of the central galaxy is controlled by the hierarchical mass growth of the host halo
Summary
The brightest cluster galaxies (BCGs) are the most luminous galaxies among the member galaxies in a cluster. The mass ratio of the stellar mass of BCGs to their host group or cluster reveals how efficiently the baryonic component has been converted into stars Both direct and indirect methods have been employed to study this relation. We examine the stellar mass–halo mass relation of BCGs using a sample of X-ray groups and clusters with the widest halo mass range available to date. To this end, we perform a search based on the photometric and spectroscopic redshifts provided by the Sloan Digital Sky Survey (SDSS DR14) to identify BCGs of clusters found in SPectroscoic IDentification of eROSITA Sources–COnstrain Dark Energy with X-ray clusters (SPIDERS-CODEX). We describe the basic specifications of the six surveys
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