Large Equivalent Width Galaxies from Large Area Lyman-Alpha Survey

Details Large Equivalent Width Galaxies from Large Area Lyman-Alpha Survey Large Equivalent Width Galaxies from Large Area Lyman-Alpha Survey

May 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aas...198.2004m&link_type=abstract

American Astronomical Society, 198th AAS Meeting, #20.04; Bulletin of the American Astronomical Society, Vol. 33, p.815

Astronomy and Astrophysics

Astronomy

Scientific paper

We find many candidate z=4.5 Lyman-alpha emitting galaxies in our LALA (Large Area Lyman Alpha) survey. More than half of these sources have rest frame equivalent widths greater than 200 Angstroms, which is the largest equivalent width expected for a standard stellar initial mass function (IMF). Either these sources are type II quasars or galaxies with an IMF dominated by massive stars. From Chandra Deep Field X-ray source counts, we estimate that only 10-20% of the LALA sources can be type II quasars. This then indicates that some galaxies at high redshifts had top heavy IMFs.

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