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

Author(s): Hilton, Matt; Hasselfield, Matthew; Sifon, Cristobal; Baker, Andrew J; Barrientos, Luis Felipe; et al

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Abstract: We present a first measurement of the stellar mass component of galaxy clusters selected via the Sunyaev-Zel’dovich (SZ) effect, using 3.6 and 4.5 mu 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 M-500 = 6.9 x 10(14) M-circle dot. We measure the 3.6 and 4.5 mu m galaxy luminosity functions, finding the characteristic magnitude (m*) and faint-end slope (alpha) to be similar to those for infrared-selected cluster samples. We perform the first measurements of the scaling of SZ observables (Y-500 and y(0)) with both brightest cluster galaxy (BCG) stellar mass and total cluster stellar mass (M-500(star)). We find a significant correlation between BCG stellar mass and Y-500 (E(z)(-2/3) D-A(2) Y-500 proportional to 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-A(2) Y-500 proportional to M-500(star) (1.0 +/- 0.6) for the scaling with total stellar mass. The mass fraction in stars spans the range 0.006-0.034, with the second ranked cluster in terms of dynamical mass (ACT-CL J0237-4939) having an unusually low total stellar mass and the lowest stellar mass fraction. For the five clusters with gas mass measurements available in the literature, we see no evidence for a shortfall of baryons relative to the cosmic mean value.
Publication Date: 11-Nov-2013
Electronic Publication Date: 12-Sep-2013
Citation: Hilton, Matt, Hasselfield, Matthew, Sifon, Cristobal, Baker, Andrew J, Felipe Barrientos, L, Battaglia, Nicholas, Bond, J Richard, Crichton, Devin, Das, Sudeep, Devlin, Mark J, Gralla, Megan, Hajian, Amir, Hincks, Adam D, Hughes, John P, Infante, Leopoldo, Irwin, Kent D, Kosowsky, Arthur, Lin, Yen-Ting, Marriage, Tobias A, Marsden, Danica, Menanteau, Felipe, Moodley, Kavilan, Niemack, Michael D, Nolta, Mike R, Page, Lyman A, Reese, Erik D, Sievers, Jon, Spergel, David N, Wollack, Edward J. (2013). The Atacama Cosmology Telescope: the stellar content of galaxy clusters selected using the Sunyaev-Zel’dovich effect. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 435 (3469 - 3480. doi:10.1093/mnras/stt1535
DOI: doi:10.1093/mnras/stt1535
ISSN: 0035-8711
EISSN: 1365-2966
Pages: 3469 - 3480
Type of Material: Journal Article
Version: Final published version. Article is made available in OAR by the publisher's permission or policy.

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