Stark, Daniel P. and Ellis, Richard S. (2006) Searching for the sources responsible for cosmic reionization: Probing the redshift range 7 < z < 10 and beyond. New Astronomy Reviews, 50 (1-3). pp. 46-52. ISSN 1387-6473 http://resolver.caltech.edu/CaltechAUTHORS:20110602-090000534
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We review recent observations that suggest that the global star formation rate density of UV-bright galaxies is declining monotonically with redshift over 3 < z < 7 and illustrate the challenges that a continuation of this decline poses in explaining the assembled stellar mass in several z ~ 6 galaxies deduced from recent Spitzer data. A plausible conclusion is a vigorous period of yet earlier star formation. Prior to JWST and TMT, strong lensing offers a unique probe of the extent of this earlier activity. We discuss the first results of a blind spectroscopic survey of 10 lensing clusters for 8.5 < z < 10 Ly α emitters using NIRSPEC on Keck. We demonstrate this survey is achieving an (unlensed) sensitivity equivalent to a star formation rate of 0.1 M_⊙ yr^(−1). A companion survey, now beginning with HST and Spitzer, will target lensed z and J-band drop-outs and probe a ≃1 arcmin^2 region 1 magnitude deeper than the UDF/NICMOS observations. In combination, both surveys will provide the first constraints on the contribution of early, low luminosity, sources to cosmic reionization.
|Additional Information:||© 2005 Elsevier B.V. Available online 22 December 2005.|
|Subject Keywords:||cosmology : observations; galaxies : high redshift; gravitational lensing|
|Official Citation:||Daniel P. Stark, Richard S. Ellis, Searching for the sources responsible for cosmic reionization: Probing the redshift range 7 < z < 10 and beyond, New Astronomy Reviews, Volume 50, Issues 1-3, First Light and Reionization: Theoretical Study and Experimental Detection of First Luminous Sources in the Universe, March 2006, Pages 46-52, ISSN 1387-6473, DOI: 10.1016/j.newar.2005.11.012. (http://www.sciencedirect.com/science/article/pii/S1387647305001491)|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Tony Diaz|
|Deposited On:||02 Jun 2011 18:43|
|Last Modified:||02 Jun 2011 18:43|
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