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Title:
The Rest-Frame Ultraviolet Luminosity Density of Star-forming Galaxies at Redshifts z>3.5
Authors:
Giavalisco, M.; Dickinson, M.; Ferguson, H. C.; Ravindranath, S.; Kretchmer, C.; Moustakas, L. A.; Madau, P.; Fall, S. M.; Gardner, Jonathan P.; Livio, M.; Papovich, C.; Renzini, A.; Spinrad, H.; Stern, D.; Riess, A.
Affiliation:
AA(Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218.), AB(Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218.; Johns Hopkins University, 3400 North Charles Street, Baltimore, MD 21218-2686.), AC(Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218.; Johns Hopkins University, 3400 North Charles Street, Baltimore, MD 21218-2686.), AD(Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218.), AE(Johns Hopkins University, 3400 North Charles Street, Baltimore, MD 21218-2686.), AF(Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218.), AG(University of California, Santa Cruz, 1156 High Street, Santa Cruz, CA 95064.), AH(Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218.), AI(NASA Goddard Space Flight Center, Code 681, Greenbelt, MD 20771.), AJ(Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218.), AK(Steward Observatory, University of Arizona, 933 Cherry Avenue, Tucson, AZ 85721-0065.), AL(European Southern Observatory, Karl Schwarzschild Strasse 2, D-85748, Garching, Germany.), AM(University of California at Berkeley, Berkeley, CA 94720.), AN(Jet Propulsion Laboratory, Caltech, MS 169-327, Pasadena, CA 91109.), AO(Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218.)
Publication:
The Astrophysical Journal, Volume 600, Issue 2, pp. L103-L106. (ApJL Homepage)
Publication Date:
01/2004
Origin:
UCP
ApJ Keywords:
Cosmology: Observations, Galaxies: Distances and Redshifts, Galaxies: Evolution, Galaxies: Formation
DOI:
10.1086/381244
Bibliographic Code:
2004ApJ...600L.103G

Abstract

We have measured the rest-frame λ~1500 Å comoving specific luminosity density of star-forming galaxies at redshift 3.5<z<6.5 (Lyman break galaxies [LBGs]) selected from deep, multiband images taken with the Hubble Space Telescope and the Advanced Camera for Surveys, obtained as part of the Great Observatories Origins Deep Survey (GOODS). The samples cover ~0.09 deg2 and are also relatively deep, reaching between 0.2L*3 and 0.5L*3, depending on the redshift, where L*3 is the characteristic UV luminosity of LBGs at z~3. The specific luminosity density appears to be nearly constant with redshift over the range 3<z<6, although the measure at z~6 remains relatively uncertain, because it depends on the accurate estimate of the faint counts of the z~6 sample. If LBGs are fair tracers of the cosmic star formation activity, our results suggest that at z~6, namely, at less than ~7% of the current cosmic age, the universe was already producing stars as vigorously as it did near its maximum several gigayears later, at 1<~z<~3.

Based on observations obtained with the NASA/ESA Hubble Space Telescope obtained at the Space Telescope Science Institute (STScI), which is operated by the Association of Universities for Research in Astronomy (AURA), Inc., under NASA contract NAS5-26555.

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