http://arxiv.org/abs/2111.05150
We estimate the mass accretion rate (MAR) of the 346 clusters of galaxies in the HectoMAP Cluster Survey. The clusters span the redshift range $0.17-0.42$ and the $M_{200}$ mass range $\approx (0.5 – 3.5)\cdot 10^{14}$M$\odot$. The MAR estimate is based on the caustic technique along with a spherical infall model. Our analysis extends the measurement of MARs for 129 clusters at $z<0.3$ from the Cluster Infall Regions in the Sloan Digital Sky Survey (CIRS) and the Hectospec Cluster Survey (HeCS) to redshift $z \sim 0.42$. Averaging over redshift, low-mass clusters with $M{200}\sim 0.7\cdot 10^{14}$M$\odot$ accrete $\sim 3\cdot 10^4$M$\odot$yr$^{-1}$; more massive clusters with $M_{200}\sim 2.8\cdot 10^{14}$M$\odot$ accrete $\sim 1\cdot 10^5$M$\odot$yr$^{-1}$. Low- and high-mass clusters increase their MAR by $\sim 46\%$ and $\sim 84\%$, respectively, as the redshift increases from $z\sim 0.17-0.29$ to $z\sim 0.34-0.42$. The MARs at fixed redshift increase with mass and MARs at fixed mass increase with redshift in agreement with $\Lambda$CDM cosmological model for hierarchical structure formation. We consider the extension of MAR measurements to $z \sim 1$.
M. Pizzardo, J. Sohn, M. Geller, et. al.
Wed, 10 Nov 21
6/63
Comments: 14 pages, 5 figures, 2 tables