The clustering of extremely red objects

David P. Palamara, Michael J.I. Brown, Buell T. Jannuzi, Arjun Dey, Daniel Stern, Kevin A. Pimbblet, Benjamin J. Weiner, Matthew L.N. Ashby, C. S. Kochanek, Anthony Gonzalez, Mark Brodwin, Emeric Le Floc'H, Marcia Rieke

Research output: Contribution to journalArticlepeer-review

10 Scopus citations


We measure the clustering of extremely red objects (EROs) in 8 deg 2 of the NOAO Deep Wide Field Survey Boötes field in order to establish robust links between ERO (z 1.2) and local galaxy (z < 0.1) populations. Three different color selection criteria from the literature are analyzed to assess the consequences of using different criteria for selecting EROs. Specifically, our samples are (R-Ks ) > 5.0 (28, 724 galaxies), (I-Ks ) > 4.0 (22, 451 galaxies), and (I-[3.6]) > 5.0 (64, 370 galaxies). Magnitude-limited samples show the correlation length (r 0) to increase for more luminous EROs, implying a correlation with stellar mass. We can separate star-forming and passive ERO populations using the (Ks-[24]) and ([3.6]-[24]) colors to Ks = 18.4 and [3.6] = 17.5, respectively. Star-forming and passive EROs in magnitude-limited samples have different clustering properties and host dark halo masses and cannot be simply understood as a single population. Based on the clustering, we find that bright passive EROs are the likely progenitors of ≳ 4L* elliptical galaxies. Bright EROs with ongoing star formation were found to occupy denser environments than star-forming galaxies in the local universe, making these the likely progenitors of ≳ L* local ellipticals. This suggests that the progenitors of massive ≳ 4L* local ellipticals had stopped forming stars by z ≳ 1.2, but that the progenitors of less massive ellipticals (down to L*) can still show significant star formation at this epoch.

Original languageEnglish (US)
Article number31
JournalAstrophysical Journal
Issue number1
StatePublished - Feb 10 2013


  • cosmology: observations
  • galaxies: elliptical and lenticular, cD
  • galaxies: evolution
  • galaxies: formation
  • galaxies: high-redshift
  • galaxies: starburst
  • galaxies: statistics
  • large-scale structure of universe

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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