A New Measurement of the Stellar Mass Density at z~5: Implications for the Sources of Cosmic Reionization

Details A New Measurement of the Stellar Mass Density at z~5: Implications for the Sources of Cosmic Reionization A New Measurement of the Stellar Mass Density at z~5: Implications for the Sources of Cosmic Reionization

2006-04-12

arxiv.org/abs/astro-ph/0604250v2

Astrophys.J.659:84-97,2007

Astronomy and Astrophysics

Astrophysics

Accepted for Publication in ApJ, 39 pages

Scientific paper

10.1086/511325

We present a new measurement of the integrated stellar mass per comoving volume at redshift 5 determined via spectral energy fitting drawn from a sample of 214 photometrically-selected galaxies with z'<26.5 in the southern GOODS field. Following procedures introduced by Eyles et al. (2005), we estimate stellar masses for various sub-samples for which reliable and unconfused Spitzer IRAC detections are available. A spectroscopic sample of 14 of the most luminous sources with =4.92 provides a firm lower limit to the stellar mass density of 1e6 Msun/Mpc^3. Several galaxies in this sub-sample have masses of order 10^11 Msun implying significant earlier activity occurred in massive systems. We then consider a larger sample whose photometric redshifts in the publicly-available GOODS-MUSIC catalog lie in the range 4.4

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