Searching for High-redshift Lyα Emitters in the COSMOS Field with NEWFIRM

Details Searching for High-redshift Lyα Emitters in the COSMOS Field with NEWFIRM Searching for High-redshift Lyα Emitters in the COSMOS Field with NEWFIRM

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21912902k&link_type=abstract

American Astronomical Society, AAS Meeting #219, #129.02

Astronomy and Astrophysics

Astronomy

Scientific paper

The study of Lyα emission in the high-redshift universe is a useful probe of the epoch of reionization, as the Lyα line should be attenuated by the intergalactic medium if the local neutral hydrogen fraction is over 50%. Here we discuss the results of a deep and wide imaging search for Lyα emitters in the COSMOS field. We have used two ultra-narrowband filters (filter widths of ∼8 and 9 AA) on the NEWFIRM camera, installed on the Mayall 4m telescope at Kitt Peak National Observatory, in addition to public archival broadband optical and near-IR imaging data, in order to isolate Lyα emitters at z = 7.7; such ultra-narrowband imaging searches have proven to be excellent at detecting Lyα emitters. We have found 5σ detections of four candidate Lyα emitters in a survey volume of 2.8 x 104 Mpc3. Each candidate has a line flux greater than 8 x 10-18 erg/s/cm2. We have used these results to construct a Lyα luminosity function, which we compare to previously established Lyα luminosit functions at z = 5.7 and z = 6.5. We discuss the impact of our findings on the evolution of the Lyα luminosity function between 5.7 < z < 7.7 and what we may conclude from that regarding the epoch of reionization.

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