The atacama cosmology telescope: The stellar content of galaxy clusters selected using the sunyaev-zel'dovich effect

Matt Hilton, Matthew Hasselfield, Cristóbal Sifón, Andrew J. Baker, L. Felipe Barrientos, Nicholas Battaglia, J. Richard Bond, Devin Crichton, Sudeep Das, Mark J. Devlin, Megan Gralla, Amir Hajian, Adam D. Hincks, John P. Hughes, Leopoldo Infante, Kent D. Irwin, Arthur Kosowsky, Yen Ting Lin, Tobias A. Marriage, Danica MarsdenFelipe Menanteau, Kavilan Moodley, Michael D. Niemack, Mike R. Nolta, Lyman A. Page, Erik D. Reese, Jon Sievers, David N. Spergel, Edward J. Wollack

Research output: Contribution to journalArticlepeer-review


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 μm 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 ζ = 0.50) and have dynamical mass measurements, accurate to about 30 per cent, with median M500 = 6.9 × 1014; M⊙. We measure the 3.6 and 4.5 μm galaxy luminosity functions, finding the characteristic magnitude (m*) and faint-end slope (α) to be similar to those for infrared-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 (Mstar500). We find a significant correlation between BCG stellar mass and Y500 (E(ζ)-2/3 D2 A Y500 α M1.2±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(ζ)-2/3 D2 A Y500 α Mstar 500 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.

Original languageEnglish (US)
Pages (from-to)3469-3480
Number of pages12
JournalMonthly Notices of the Royal Astronomical Society
Issue number4
StatePublished - Nov 2013
Externally publishedYes


  • Cosmology: observations
  • Galaxies: Clusters: general
  • Galaxies: luminosity function, mass function
  • Galaxies: stellar content

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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