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To appear in \Galaxy Evolution: Theory and Observations (2002)" RevMexAA(SC) THE REDSHIFT DISTRIBUTION OF SUB-MM GALAXIES
 

Summary: To appear in \Galaxy Evolution: Theory and Observations (2002)" RevMexAA(SC)
THE REDSHIFT DISTRIBUTION OF SUB-MM GALAXIES
Itziar Aretxaga, 1 David H. Hughes, 1 Edward L. Chapin, 1 Enrique Gazta~naga, 1,2 James S. Dunlop 3
RESUMEN
Describimos un tecnica de Monte Carlo para calcular corrimientos al rojo fotometricos de galaxias seleccionadas
en bandas submilimetricas (SCUBA) y milimetricas (MAMBO), en base a sus colores en los dominios radio
a IR lejano. La distribucion acumulada de corrimientos al rojo de galaxias seleccionadas en campos amplios
podra tener una larga cola. Se espera que del 40 al 90% de la poblacion se encuentre entre 2  z  4 pero, al
mismo tiempo, el 50% de las galaxias tienen colores que son consistentes con z > 4.
ABSTRACT
Ground-based sub-mm (SCUBA) and mm-wavelength (MAMBO) blank- eld surveys have identi ed more
than 100 sources, the majority of which are believed to be dusty optically-obscured starburst galaxies. Colours
derived from various combinations of FIR, submillimetre, millimetre, and radio uxes provide the only currently
available means to determine the redshift distribution of this new galaxy population.
In this paper we apply a Monte-Carlo photometric-redshift technique to the multi-wavelength data avail-
able for 50 galaxies selected at 850m in wide-area SCUBA surveys. We calculate a probability distribution for
the redshift of each galaxy, which includes a detailed treatment of the observational errors and uncertainties
in the priors. The cumulative redshift distribution for this population is asymmetric, and broader than those
published elsewhere, with a signi cant high-z tail. Approximately 40 to 90% of the sub-mm population is
expected to have redshifts in the interval 2  z  4. We also show, however, that the colours of many (50%)

  

Source: Aretxaga, Itziar - Instituto Nacional de Astrofísica Óptica y Electrónica

 

Collections: Physics