Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21336205b&link_type=abstract
American Astronomical Society, AAS Meeting #213, #362.05; Bulletin of the American Astronomical Society, Vol. 41, p.512
Astronomy and Astrophysics
Astronomy
Scientific paper
We report on the direct spectroscopic observations of escaping Lyman continuum radiation in individual galaxy spectra drawn from a sample of rest-UV selected (Lyman Break) galaxies at z 3. The fraction of UV photons which manage to escape from galaxies at high redshift is a key parameter required for our understanding of re-ionization and the physical conditions in the IGM at z>2. Until now, there have been no spectroscopic observations available that would point to a relationship between this escape fraction and intrinsic galaxy properties. We have obtained very deep Keck LRIS-B ( 8-10hrs total exposure time) spectroscopy in the rest-frame UV for a sample of 120 galaxies at z 3, and we were able to directly measure the escaping Lyman continuum radiation in spectra of 13 sources. This spectroscopic sample in conjunction with optical and near-IR imaging allows us to investigate how properties such as star formation rate, stellar mass and UV morphology of galaxies relate to measurements of flux in the Lyman continuum.
MB and CCS have been supported by the NSF through grants AST-0606912.
Bogosavljevic Milan
Steidel Charles C.
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