Surveys for Lensed Lyman Alpha Galaxies at z>7

Details Surveys for Lensed Lyman Alpha Galaxies at z>7 Surveys for Lensed Lyman Alpha Galaxies at z>7

May 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...210.7003s&link_type=abstract

American Astronomical Society Meeting 210, #70.03; Bulletin of the American Astronomical Society, Vol. 39, p.177

Astronomy and Astrophysics

Astronomy

Scientific paper

The first constraints are now emerging on the abundance of star-forming galaxies at 7 < z < 10. I will discuss new results from two surveys for gravitationally-lensed galaxies at z > 7 : 1) a Keck near-infrared spectroscopic survey for z 8-10 Lyman-alpha emitters (LAEs) toward intermediate-redshift galaxy clusters, and 2) a deep near-infrared Hubble Space Telescope survey of galaxy clusters for magnified Lyman-break galaxies (LBGs) at z 7-10. These surveys have uncovered a surprisingly large abundance of candidate star-forming galaxies at very early times in cosmic history. Such a large abundance is only explicable if the initial mass function is top-heavy or if the observations are probing an overdensity in the underlying dark matter mass distribution. I will detail follow-up spectroscopic efforts to confirm that this population is indeed at z > 7 and will discuss implications for reionization.

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