New Constraints on the Escape Fraction at z 1

Details New Constraints on the Escape Fraction at z 1 New Constraints on the Escape Fraction at z 1

May 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...20925205s&link_type=abstract

2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #252.05; Bulletin of the American Astronomical Society,

Astronomy and Astrophysics

Astronomy

Scientific paper

We examine deep far-ultraviolet imaging (m_AB(1600 Å) < 29) of the Hubble Deep Field-North (HDF-N) and the Hubble Ultra Deep Field (UDF) to search for escaping Lyman continuum radiation from star-forming galaxies at z 1.3. Of the 20 galaxies sufficiently bright for possible detection in the far-UV, none are detected. Once the starburst age and intergalactic HI absorption are accounted for, we derive 3σ limits to the relative escape fractions between 0.16 < f_esc,rel < 1.0 and a stacked limit of f_esc,rel < 0.11. Our stacked limit is about equal to the average detected relative escape fraction at z 3 so deeper observations are required to determine if f_esc is evolving. We see no indication of any galaxies with a relative escape fraction near unity, as seen in individual z 3 galaxies in deep spectroscopic studies. The difference may be attributed to luminosity differences in the samples or due to the different regions of the Lyman continuum that are observed (700 Å for our study and 900 Å with spectroscopy at z 3).

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