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2003MNRAS.342..759A - Mon. Not. R. Astron. Soc., 342, 759-801 (2003/July-1)
Breaking the `redshift deadlock'- II. The redshift distribution for the submillimetre population of galaxies.
ARETXAGA I., HUGHES D.H., CHAPIN E.L., GAZTANAGA E., DUNLOP J.S. and IVISON R.J.
Abstract (from CDS):
In this paper we apply our Monte Carlo photometric redshift technique, introduced recently by Hughes et al. in Paper I, to the multiwavelength data available for 77 galaxies selected at 850 µm and 1.25 mm. We calculate a probability distribution for the redshift of each galaxy, which includes a detailed treatment of the observational errors and uncertainties in the evolutionary model. The cumulative redshift distribution of the submillimetre galaxy population that we present in this paper, based on 50 galaxies found in wide-area SCUBA surveys, is asymmetric, and broader than those published elsewhere, with a significant high-z tail for some of the evolutionary models considered. Approximately 40 to 90 per cent of the submillimetre population is expected to have redshifts in the interval 2 ≤z ≤ 4. Whilst this result is completely consistent with earlier estimates for the submillimetre galaxy population, we also show that the colours of many (≲50 per cent) individual submillimetre sources, detected only at 850 µm with non-detections at other wavelengths, are consistent with those of starburst galaxies that lie at extreme redshifts, z > 4. Spectroscopic confirmation of the redshifts, through the detection of rest-frame far-infrared-millimetre wavelength molecular transition lines, will ultimately calibrate the accuracy of this technique. We use the redshift probability distribution of HDF850.1 to illustrate the ability of the method to guide the choice of possible frequency tunings on the broad-band spectroscopic receivers that equip the large-aperture single-dish millimetre and centimetre wavelength telescopes.
Abstract Copyright: 2003 RAS
Journal keyword(s): stars: formation - galaxies: evolution - cosmology: miscellaneous - infrared: galaxies - submillimetre
Simbad objects: 105
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