The Atacama Cosmology Telescope: the stellar content of galaxy clusters selected using the Sunyaev–Zel'dovich effect

We present a first measurement of the stellar mass component of galaxy clusters selected via the Sunyaev-Zel’dovich (SZ) effect, using 3.6 m and 4.5 m photometry from the Spitzer Space Telescope. Our sample consists of 14 clusters detected by the Atacama Cosmology Telescope (ACT), which span the redshift range 0:27 < z < 1:07 (median z = 0:50), and have dynamical mass measurements, accurate to about 30 per cent, with median M500 = 6:9 10 14 M . We measure the 3.6 m and 4.5 m galaxy luminosity functions, finding the characteristic magnitude (m ) and faint-end slope (a) to be similar to those for IR-selected cluster samples. We perform the first measurements of the scaling of SZ-observables (Y500 and y0) with both brightest cluster galaxy (BCG) stellar mass and total cluster stellar mass (M star ). We find a significant correlation between BCG stellar mass and Y500 (E(z) 2=3 D 2 Y500 µ M 1:2 0:6 ), although we are not able to obtain a strong constraint on the slope of the relation due to the small sample size. Additionally, we obtain E(z) 2=3 D 2 Y500 µ M star 500 1:0 0:6 for

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