Probing Extreme-EW Lyman-a Emitting Galaxy Populations Using A Broad Band Selection Technique.

Details Probing Extreme-EW Lyman-a Emitting Galaxy Populations Using A Broad Band Selection Technique. Probing Extreme-EW Lyman-a Emitting Galaxy Populations Using A Broad Band Selection Technique.

Jan 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21743024b&link_type=abstract

American Astronomical Society, AAS Meeting #217, #430.24; Bulletin of the American Astronomical Society, Vol. 43, 2011

Astronomy and Astrophysics

Astronomy

Scientific paper

The emission mechanisms that drive extreme-EW Lyman-a emitting galaxies (LAEs), though studied for the last decade, still are not well understood. The explanation for their pronounced Lyman-a emission has ranged from population III stars, to obscured AGN, to collapsing gas clouds. Since only a small number of these systems have been studied in depth, it is unknown whether or not LAEs are simply a stage in typical galaxy evolution or a rare and more peculiar phenomenon. Most studies of LAEs have been completed using narrow-band filter searches probing a small redshift range, and thus a small volume. We have developed a broad-band selection technique to probe the high equivalent width end of the LAE population. This method probes a much larger volume and redshift range. We have used CFHT-LS Deep 3 Field photometry to select LAE candidates for follow-up spectroscopy using WIYN/Hydra multi-object spectrograph. We have confirmed 30 strong LAEs in the CFHT-LS Deep 3 with line fluxes between 5e-17 and 8e-16 ergs/(cm2 s), one QSO, and 2 low redshift Hb -O[III] emitters out of 52 photometrically selected candidates. These LAE systems exhibit narrow emission lines and do not display He II or CIV emission at the depth of a 3-s limit of 1e-17 ergs/(cm2 s Å) with 7 hours of exposure time on WIYN/Hydra.

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