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Title:
High-redshift Lyman-α galaxies
Authors:
Malhotra, Sangeeta; Rhoads, James E.
Affiliation:
AA(Department of Physics and Astronomy, Arizona State University, Tempe, AZ 85287-1504, USA ), AB(School of Earth and Space Exploration, Arizona State University, Tempe, AZ 85287-1504, USA )
Publication:
Highlights of Astronomy, Volume 14, p. 254-254
Publication Date:
08/2007
Origin:
CUP
DOI:
10.1017/S1743921307010368
Bibliographic Code:
2007HiA....14..254M

Abstract

A strong Lyman-α line enables relatively easy detection of high redshift galaxies. Lyman-α galaxies are now known from z = 3 to 6.6. No evolution is discerned in the Lyman-α line luminosity function in this redshift range. This implies that the intergalactic medium at z = 6 is at least 50% ionized over more than 50% of the volume. Recent continuum detections of these galaxies from HST, MMT and Spitzer are now allowing us to address questions about the nature of these Lyman-α emitters, their stellar populations and ages. We find that by and large the Lyman-α galaxies are young galaxies dominated by stellar populations that are less than 25 Myr old.
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