Astronomy and Astrophysics – Astrophysics – Cosmology and Extragalactic Astrophysics
Scientific paper
2009-06-24
Astrophys.J.703:L162-L166,2009
Astronomy and Astrophysics
Astrophysics
Cosmology and Extragalactic Astrophysics
Replaced with ApJL accepted version, 5 pages, 2 figures
Scientific paper
10.1088/0004-637X/703/2/L162
We investigate the fraction of z ~ 0.3 Lyman alpha emitting galaxies (LAEs) which host active galactic nucleus activity, which is typically from 1 - 5% at 2 < z < 6. Using optical spectroscopy of 23 LAEs at 0.2 < z < 0.45 selected with GALEX UV data, we probe for AGN with a variety of methods, including line widths, diagnostic line ratios, high-ionization emission, infrared activity and X-ray luminosity. We found that our sample of low-redshift LAEs has an AGN fraction of 43 ^{+18}{-26}%, significantly higher than at high redshift. While previous results have shown that low-redshift LAEs have a lower space density than their high-redshift analogs, these results show that star-forming LAEs at low-redshift are rarer still. Accounting for differences in available AGN classification methods, we conclude that rest-frame optical spectroscopy is necessary to identify low-luminosity AGNs in LAEs at high redshift, and that limits on the X-ray flux are necessary to determine the extent to which the AGN contaminates the Lyman alpha fluxes.
Cohen Seth H.
Finkelstein Steven L.
Malhotra Sangeeta
Papovich Casey
Rhoads James E.
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