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Title: THE STAR FORMATION HISTORY OF BCGs TO z = 1.8 FROM THE SpARCS/SWIRE SURVEY: EVIDENCE FOR SIGNIFICANT IN SITU STAR FORMATION AT HIGH REDSHIFT

Abstract

We present the results of an MIPS-24 μm study of the brightest cluster galaxies (BCGs) of 535 high-redshift galaxy clusters. The clusters are drawn from the Spitzer Adaptation of the Red-Sequence Cluster Survey, which effectively provides a sample selected on total stellar mass, over 0.2 < z < 1.8 within the Spitzer Wide-Area Infrared Extragalactic (SWIRE) Survey fields. Twenty percent, or 106 clusters, have spectroscopically confirmed redshifts, and the rest have redshifts estimated from the color of their red sequence. A comparison with the public SWIRE images detects 125 individual BCGs at 24 μm ≳ 100 μJy, or 23%. The luminosity-limited detection rate of BCGs in similar richness clusters (N{sub gal} > 12) increases rapidly with redshift. Above z ∼ 1, an average of ∼20% of the sample have 24 μm inferred infrared luminosities of L{sub IR} > 10{sup 12} L{sub ⊙}, while the fraction below z ∼ 1 exhibiting such luminosities is <1%. The Spitzer-IRAC colors indicate the bulk of the 24 μm detected population is predominantly powered by star formation, with only 7/125 galaxies lying within the color region inhabited by active galactic nuclei (AGNs). Simple arguments limit the star formation activity to several hundred million years andmore » this may therefore be indicative of the timescale for AGN feedback to halt the star formation. Below redshift z ∼ 1, there is not enough star formation to significantly contribute to the overall stellar mass of the BCG population, and therefore BCG growth is likely dominated by dry mergers. Above z ∼ 1, however, the inferred star formation would double the stellar mass of the BCGs and is comparable to the mass assembly predicted by simulations through dry mergers. We cannot yet constrain the process driving the star formation for the overall sample, though a single object studied in detail is consistent with a gas-rich merger.« less

Authors:
;  [1];  [2]; ;  [3];  [4];  [5];  [6];  [7];  [8];  [9]
  1. McGill University, 3600 rue University, Montreal, QC H3A 2T8 (Canada)
  2. Leiden Observatory, University of Leiden, P.O. Box 9514, 2300 RA Leiden (Netherlands)
  3. Department of Astronomy and Astrophysics, University of Toronto, 50 St. George Street, Toronto, ON M5S 3H4 (Canada)
  4. Centre for Astrophysics Research, University of Hertfordshire, Hatfield, Hertfordshire AL109AB (United Kingdom)
  5. Kavli Institue for Particle Physics and Cosmology, Stanford University, 452 Lomita Mall, Stanford, CA 94305-4085 (United States)
  6. Australian Astronomical Observatory, P.O. Box 915, North Ryde, NSW 1670 (Australia)
  7. Department of Physics and Astronomy, University of California, Riverside, CA 92521 (United States)
  8. Spitzer Science Center, California Institute of Technology, M/S 314-6, Pasadena, CA 91125 (United States)
  9. NASA Herschel Science Center, IPAC, 770 South Wilson Avenue, Pasadena, CA 91125 (United States)
Publication Date:
OSTI Identifier:
22521861
Resource Type:
Journal Article
Journal Name:
Astrophysical Journal
Additional Journal Information:
Journal Volume: 814; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0004-637X
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; COLOR; COMPARATIVE EVALUATIONS; DETECTION; GALACTIC EVOLUTION; GALAXIES; GALAXY CLUSTERS; GALAXY NUCLEI; INFRARED RADIATION; LUMINOSITY; MASS; RED SHIFT; STAR EVOLUTION; STARS

Citation Formats

Webb, Tracy M. A., Bonaventura, Nina, Muzzin, Adam, Noble, Allison, Yee, H. K. C., Geach, James, Hezevah, Yashar, Lidman, Chris, Wilson, Gillian, Surace, Jason, and Shupe, David. THE STAR FORMATION HISTORY OF BCGs TO z = 1.8 FROM THE SpARCS/SWIRE SURVEY: EVIDENCE FOR SIGNIFICANT IN SITU STAR FORMATION AT HIGH REDSHIFT. United States: N. p., 2015. Web. doi:10.1088/0004-637X/814/2/96.
Webb, Tracy M. A., Bonaventura, Nina, Muzzin, Adam, Noble, Allison, Yee, H. K. C., Geach, James, Hezevah, Yashar, Lidman, Chris, Wilson, Gillian, Surace, Jason, & Shupe, David. THE STAR FORMATION HISTORY OF BCGs TO z = 1.8 FROM THE SpARCS/SWIRE SURVEY: EVIDENCE FOR SIGNIFICANT IN SITU STAR FORMATION AT HIGH REDSHIFT. United States. doi:10.1088/0004-637X/814/2/96.
Webb, Tracy M. A., Bonaventura, Nina, Muzzin, Adam, Noble, Allison, Yee, H. K. C., Geach, James, Hezevah, Yashar, Lidman, Chris, Wilson, Gillian, Surace, Jason, and Shupe, David. Tue . "THE STAR FORMATION HISTORY OF BCGs TO z = 1.8 FROM THE SpARCS/SWIRE SURVEY: EVIDENCE FOR SIGNIFICANT IN SITU STAR FORMATION AT HIGH REDSHIFT". United States. doi:10.1088/0004-637X/814/2/96.
@article{osti_22521861,
title = {THE STAR FORMATION HISTORY OF BCGs TO z = 1.8 FROM THE SpARCS/SWIRE SURVEY: EVIDENCE FOR SIGNIFICANT IN SITU STAR FORMATION AT HIGH REDSHIFT},
author = {Webb, Tracy M. A. and Bonaventura, Nina and Muzzin, Adam and Noble, Allison and Yee, H. K. C. and Geach, James and Hezevah, Yashar and Lidman, Chris and Wilson, Gillian and Surace, Jason and Shupe, David},
abstractNote = {We present the results of an MIPS-24 μm study of the brightest cluster galaxies (BCGs) of 535 high-redshift galaxy clusters. The clusters are drawn from the Spitzer Adaptation of the Red-Sequence Cluster Survey, which effectively provides a sample selected on total stellar mass, over 0.2 < z < 1.8 within the Spitzer Wide-Area Infrared Extragalactic (SWIRE) Survey fields. Twenty percent, or 106 clusters, have spectroscopically confirmed redshifts, and the rest have redshifts estimated from the color of their red sequence. A comparison with the public SWIRE images detects 125 individual BCGs at 24 μm ≳ 100 μJy, or 23%. The luminosity-limited detection rate of BCGs in similar richness clusters (N{sub gal} > 12) increases rapidly with redshift. Above z ∼ 1, an average of ∼20% of the sample have 24 μm inferred infrared luminosities of L{sub IR} > 10{sup 12} L{sub ⊙}, while the fraction below z ∼ 1 exhibiting such luminosities is <1%. The Spitzer-IRAC colors indicate the bulk of the 24 μm detected population is predominantly powered by star formation, with only 7/125 galaxies lying within the color region inhabited by active galactic nuclei (AGNs). Simple arguments limit the star formation activity to several hundred million years and this may therefore be indicative of the timescale for AGN feedback to halt the star formation. Below redshift z ∼ 1, there is not enough star formation to significantly contribute to the overall stellar mass of the BCG population, and therefore BCG growth is likely dominated by dry mergers. Above z ∼ 1, however, the inferred star formation would double the stellar mass of the BCGs and is comparable to the mass assembly predicted by simulations through dry mergers. We cannot yet constrain the process driving the star formation for the overall sample, though a single object studied in detail is consistent with a gas-rich merger.},
doi = {10.1088/0004-637X/814/2/96},
journal = {Astrophysical Journal},
issn = {0004-637X},
number = 2,
volume = 814,
place = {United States},
year = {2015},
month = {12}
}