Properties of High Equivalent Width Lyman-α Emitting Galaxies at Redshifts Between 2.5 and 3.5

Details Properties of High Equivalent Width Lyman-α Emitting Galaxies at Redshifts Between 2.5 and 3.5 Properties of High Equivalent Width Lyman-α Emitting Galaxies at Redshifts Between 2.5 and 3.5

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21934009b&link_type=abstract

American Astronomical Society, AAS Meeting #219, #340.09

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Scientific paper

Lyman-α emitting galaxies (LAEs) have been studied for the last decade, yet there are few observations of high equivalent width (EW) objects. The emission mechanisms that drive high EW LAEs, though studied for the last decade, still are not well understood. Since only small numbers have been discovered, it is unknown whether these high EW LAEs make up a population that is undergoing a peculiar stage of galactic evolution, or simply just a more vigorous version of star formation coupled with a clumpy ISM. We have developed a broadband selection technique to effectively increase the number of known LAEs, to build a bigger sample of high EW LAEs. While these high EW LAEs are less numerous than typical LAEs, we are able to probe much larger volumes than blind narrowband or spectroscopic searches. Using photometry from the Deep 2 and 3 fields from the CFHT-Legacy Survey, we have spectroscopically confirmed 63 LAEs with redshifts between 2.5 and 3.5 using the WIYN/Hydra multi-object spectrograph. These LAEs exhibit narrow Lyman-α emission, and show no other line emission to our spectroscopic flux limits. Using UV continuum fitting techniques in conjunction with our spectroscopic data, we have calculated equivalent widths, star formation rates, internal reddening, and escape fractions for our program galaxies. Of the 63 LAEs that we discovered, 29 show EWs that are in excess of 100 Å in the rest frame.

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