X-ray Constraints on the Lyman Alpha Escape Fraction

Details X-ray Constraints on the Lyman Alpha Escape Fraction X-ray Constraints on the Lyman Alpha Escape Fraction

May 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21822828z&link_type=abstract

American Astronomical Society, AAS Meeting #218, #228.28; Bulletin of the American Astronomical Society, Vol. 43, 2011

Astronomy and Astrophysics

Astronomy

Scientific paper

We use coadded X-ray flux of all known Lyman alpha emitters in Chandra Deep Field South using the 4 megasecond image, to place sensitive upper limits on the average unobscured star-formation rate (SFR) in these galaxies. A very small fraction of Lyman alpha emitter galaxies in the field are detected in the X-rays, implying a low fraction of AGN activity. After excluding the few X-ray detected Lyman alpha emitters (LAEs), we stack the undetected LAEs located in the 4 Ms CDF-S data and 250 ks ECDFS data, and get the 1 sigma upper limit on SFR_X 14% (84 % confidence level) for LAEs at redshift z 2.1 and z 3.2. At z > 4, we do not have large enough LAE samples to constrain SFR_X well. By averaging all the LAEs at z > 2, the X-ray non-detection constrains f^{Ly-α}_{esc} > 17% (84 % confidence level), and reject f^{Lyα}_{esc} < 5.7% at 99.87% confidence level. We also compare the X-ray properties of the Lyman Break galaxies in the same fields.

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