Mon. Not. R. Astron. Soc., 458, 379-393 (2016/May-1)
Stellar mass to halo mass scaling relation for X-ray-selected low-mass galaxy clusters and groups out to redshift z ≈ 1.
CHIU I., SARO A., MOHR J., DESAI S., BOCQUET S., CAPASSO R., GANGKOFNER C., GUPTA N. and LIU J.
Abstract (from CDS):
We present the stellar mass-halo mass scaling relation for 46 X-ray-selected low-mass clusters or groups detected in the XMM-Newton-Blanco Cosmology Survey (XMM-BCS) survey with masses 2 x 1013 M☉ <= M500 <= 2.5 x 1014 M☉ (median mass 8 x 1013 M☉) at redshift 0.1 <= z <= 1.02 (median redshift 0.47). The cluster binding masses M500 are inferred from the measured X-ray luminosities LX, while the stellar masses M* of the galaxy populations are estimated using near-infrared (NIR) imaging from the South Pole Telescope Deep Field survey and optical imaging from the BCS survey. With the measured LX and stellar mass M*, we determine the best-fitting stellar mass-halo mass relation, accounting for selection effects, measurement uncertainties and the intrinsic scatter in the scaling relation. The resulting mass trend is , the intrinsic (lognormal) scatter is , and there is no significant redshift trend M* ∝ (1 + z)–0.04±0.47, although the uncertainties are still large. We also examine M* within a fixed projected radius of 0.5 Mpc, showing that it provides a cluster binding mass proxy with intrinsic scatter of ≃93 per cent (1σ in M500). We compare our M*=M*(M500, z) scaling relation from the XMM-BCS clusters with samples of massive, Sunyaev-Zel'dovich Effect selected clusters (M500 ≃ 6 x 1014 M☉) and low-mass NIR-selected clusters (M500 ≃ 1014 M☉) at redshift 0.6 <= z <= 1.3. After correcting for the known mass measurement systematics in the compared samples, we find that the scaling relation is in good agreement with the high-redshift samples, suggesting that for both groups and clusters the stellar content of the galaxy populations within R500 depends strongly on mass but only weakly on redshift out to z ≃ 1.
© 2016 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society
galaxies: clusters: general - galaxies: groups: general - cosmology: observations - large-scale structure of Universe - infrared: galaxies - X-rays: galaxies: clusters
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