The Astrophysical Journal Letters

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The Astrophysical Journal Letters Volume 600 Number 2 Create an alert RSS this journal

M. Giavalisco et al 2004 ApJ 600 L103 doi:10.1086/381244

The Rest-Frame Ultraviolet Luminosity Density of Star-forming Galaxies at Redshifts z > 3.5*

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M. Giavalisco1, M. Dickinson1,2, H. C. Ferguson1,2, S. Ravindranath1, C. Kretchmer2, L. A. Moustakas1, P. Madau3, S. M. Fall1, Jonathan P. Gardner4, M. Livio1, C. Papovich5, A. Renzini6, H. Spinrad7, D. Stern8 and A. Riess1

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Abstract References Cited By

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 0.2Limg1.gif and 0.5Limg1.gif, depending on the redshift, where Limg1.gif 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 lesssim z lesssim 3.


Footnote
*  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.
Subject headings

cosmology: observations; galaxies: distances and redshifts; galaxies: evolution; galaxies: formation


Dates

Issue 2 (2004 January 10)

Received 2003 May 24, accepted for publication 2003 November 1

Published 2004 January 9



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