2006/08/21 by G. Wilson, J.-S. Huang, J. S. Huang +18 · 18 citations
Physics and Astronomy · #Astronomy and Astrophysical Research #Cosmic infrared background #Galaxies: Formation, Evolution, Phenomena #Gamma-ray bursts and supernovae #Infrared #Panchromatic film #Photometric redshift #Redshift #Spectral energy distribution #Spitzer Space Telescope #Telescope #astro-ph
paper · pdf · doi:10.1086/517923
published in The Astrophysical Journal 660(1), L59-L63 (IOP Publishing) · 9 pages, 5 figures, ApJL AEGIS special edition, in press
arxiv created 2006/08/21 · openalex publication_date 2007/04/06 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We study 87 extremely red objects (EROs), selected both to have color redder than R - [3.6] = 4.0 and to have confirmed spectroscopic redshifts. Together, these two constraints result in this sample populating a fairly narrow redshift range at 0.76 < z < 1.42. The key new ingredient included here is deep Spitzer Space Telescope Infrared Array Camera (IRAC) data. Based on [3.6] - [8.0] color, we demonstrate that it is possible to classify EROs as early-type galaxies, dusty starburst galaxies, or active galactic nuclei (AGNs; power-law types). We present ultraviolet-to-mid-infrared spectral energy distributions (SEDs) and Advanced Camera for Surveys (ACS) images, both of which support our simple IRAC color classification.