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The Nature of Extremely Red H-[4.5]>4 Galaxies revealed with SEDS and CANDELS
Astrophysical Journal Letters (2011)
  • K. I. Caputi
  • J. S. Dunlop
  • R. J. McLure
  • J, -S. Huang
  • G. G. Fazio
  • M. L. N. Ashby
  • M. Castellano
  • A. Fontana
  • M. Cirasuolo
  • O. Almaini
  • E. F. Bell
  • M. Dickinson
  • J. L. Donley
  • S. M. Faber
  • H. C. Ferguson
  • Mauro Giavalisco, University of Massachusetts - Amherst
  • N. A. Grogin
  • D. D. Kocevski
  • A. M. Koekemoer
  • D C. Koo
  • K. Lai
  • J. A. Newman
  • R. S. Somerville
Abstract
We have analysed a sample of 25 extremely red H-[4.5]>4 galaxies, selected using 4.5 micron data from the Spitzer SEDS survey and deep H-band data from the Hubble Space Telescope (HST) CANDELS survey, over ~180 square arcmin of the UKIDSS Ultra Deep Survey (UDS) field. Our aim is to investigate the nature of this rare population of mid-infrared (mid-IR) sources that display such extreme near-to-mid-IR colours. Using up to 17-band photometry (U through 8.0 microns), we have studied in detail their spectral energy distributions, including possible degeneracies in the photometric redshift/internal extinction (zphot-Av) plane. Our sample appears to include sources of very different nature. Between 45% and 75% of them are dust-obscured, massive galaxies at 3300 microJy, which at 35) sources at zphot<1. Finally, we analyse in detail two zphot~6 galaxy candidates, and discuss their plausibility and implications. Overall, our red galaxy sample contains the tip of the iceberg of a larger population of z>3 galaxies to be discovered with the future James Webb Space Telescope.
Keywords
  • infrared: galaxies,
  • galaxies: high-redshift,
  • galaxies: evolution
Publication Date
2011
Publisher Statement
This paper was harvested from ArXiv.org and ArXiv identifier is arXiv:1202.0496
Citation Information
K. I. Caputi, J. S. Dunlop, R. J. McLure, J, -S. Huang, et al.. "The Nature of Extremely Red H-[4.5]&gt;4 Galaxies revealed with SEDS and CANDELS" Astrophysical Journal Letters (2011)
Available at: http://works.bepress.com/mauro_giavalisco/6/