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28 March 2024
 
  » arxiv » astro-ph/9907216

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The Surface Density of Extremely Red Objects
D. Thompson ; S. V. W. Beckwith ; R. Fockenbrock ; J. Fried ; H. Hippelein ; J.-S. Huang ; B. von Kuhlmann ; Ch. Leinert ; K. Meisenheimer ; S. Phleps ; H.-J. Röser ; E. Thommes ; C. Wolf ;
Date 16 Jul 1999
Subject astro-ph
AbstractWe present initial results from a field survey for extremely red objects (EROs, defined here as (R-K’) >= 6 mag) covering 154 square arcminutes of sky, from the first of 7 deep, wide-field K’ images obtained as part of the Calar Alto Deep Imaging Survey (CADIS). The 5-sigma point source detection limits are K’=20.5 and R=25.0, while extended-source limits are up to 0.5-0.75 mag brighter. We identify a total of 8 bright EROs with K’ =< 19.0. Six of these bright EROs are resolved and are likely to be galaxies, while the remaining 2 are unresolved, with colors consistent with their being low-mass galactic stars. We derive a surface density for the 6 bright, extragalactic EROs of 0.039 +/- 0.016 per sq. arcmin, higher by a factor of 4 than previous values. We estimate that the volume density of bright EROs to be as high as that of nearby Seyfert galaxies.
Source arXiv, astro-ph/9907216
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