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Title:
The AGN Fraction in Lyman Alpha Galaxies
Authors:
Wang, Junxian; Rhoads, J.; Malhotra, S.
Affiliation:
AA(University of Science and Technology of China, China), AB(Arizona State University), AC(Arizona State University)
Publication:
American Astronomical Society Meeting 210, #103.01; Bulletin of the American Astronomical Society, Vol. 38, p.229
Publication Date:
05/2007
Origin:
AAS
Bibliographic Code:
2007AAS...21010301W

Abstract

A large fraction of high redshift Lyman-alpha emitters selected through narrow band imaging technique show rest frame equivalent widths (EWs) above 200\AA. This is beyond the maximum EW expected for normal stellar population. The high EWs can be produced by younger stellar populations, dust, or by type 2 AGNs. We review recent observational progresses on the AGN fraction in high redshift Lyman-alpha searches, including radio, X-ray, and optical spectroscopic observations. Specifically, we show that an upper limit of 5% of the AGN fraction has been obtained based on deep Chandra images. We also present deep IMACS multi-slit spectroscopic observations of 200 candidate z 4.5 Lyman-alpha emitting galaxies selected in the Large Area Lyman Alpha (LALA) narrow band imaging survey Cetus field. This consitutes the largest ever sample of high redshift Lyman-alpha emitters with spectroscopic follow-up.
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