The era of star formation in galaxy clusters

M. Brodwin, S. A. Stanford, Anthony H. Gonzalez, G. R. Zeimann, G. F. Snyder, C. L. Mancone, A. Pope, P. R. Eisenhardt, D. Stern, S. Alberts, M. L.N. Ashby, M. J.I. Brown, R. R. Chary, Arjun Dey, A. Galametz, D. P. Gettings, B. T. Jannuzi, E. D. Miller, J. Moustakas, L. A. Moustakas

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127 Scopus citations

Abstract

We analyze the star formation properties of 16 infrared-selected, spectroscopically confirmed galaxy clusters at 1 < z < 1.5 from the Spitzer/IRAC Shallow Cluster Survey (ISCS). We present new spectroscopic confirmation for six of these high-redshift clusters, five of which are at z > 1.35. Using infrared luminosities measured with deep Spitzer/Multiband Imaging Photometer for Spitzer observations at 24 μm, along with robust optical + IRAC photometric redshifts and spectral-energy-distribution-fitted stellar masses, we present the dust-obscured star-forming fractions, star formation rates, and specific star formation rates in these clusters as functions of redshift and projected clustercentric radius. We find that z ∼ 1.4 represents a transition redshift for the ISCS sample, with clear evidence of an unquenched era of cluster star formation at earlier times. Beyond this redshift, the fraction of star-forming cluster members increases monotonically toward the cluster centers. Indeed, the specific star formation rate in the cores of these distant clusters is consistent with field values at similar redshifts, indicating that at z > 1.4 environment-dependent quenching had not yet been established in ISCS clusters. By combining these observations with complementary studies showing a rapid increase in the active galactic nucleus (AGN) fraction, a stochastic star formation history, and a major merging episode at the same epoch in this cluster sample, we suggest that the starburst activity is likely merger-driven and that the subsequent quenching is due to feedback from merger-fueled AGNs. The totality of the evidence suggests we are witnessing the final quenching period that brings an end to the era of star formation in galaxy clusters and initiates the era of passive evolution.

Original languageEnglish (US)
Article number138
JournalAstrophysical Journal
Volume779
Issue number2
DOIs
StatePublished - Dec 20 2013

Keywords

  • galaxies: clusters: general
  • galaxies: distances and redshifts
  • galaxies: evolution
  • galaxies: formation
  • galaxies: starburst

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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    Brodwin, M., Stanford, S. A., Gonzalez, A. H., Zeimann, G. R., Snyder, G. F., Mancone, C. L., Pope, A., Eisenhardt, P. R., Stern, D., Alberts, S., Ashby, M. L. N., Brown, M. J. I., Chary, R. R., Dey, A., Galametz, A., Gettings, D. P., Jannuzi, B. T., Miller, E. D., Moustakas, J., & Moustakas, L. A. (2013). The era of star formation in galaxy clusters. Astrophysical Journal, 779(2), [138]. https://doi.org/10.1088/0004-637X/779/2/138