AAS 207th Meeting, 8-12 January 2006
Session 80 Evolution of Galaxies, Galaxies Surveys II
Poster, Tuesday, 9:20am-6:30pm, January 10, 2006, Exhibit Hall

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[80.14] A GALEX Imaging Search for Lyman Continuum Emission at z~1 in the EGS

P.G. Friedman, T.A. Small (Caltech), J.-M. Deharveng, B. Milliard (Laboratoire d'Astrophysique de Marseille), J. Lotz (UCSC, NOAO), B. Weiner (UCSC, UMD), GALEX Science Team

We are using GALEX imaging data in the Extended Groth Strip (EGS) to search for Lyman continuum emission from galaxies at z ~ 1. Our method is to sum FUV image flux at locations of DEEP2 catalog galaxies at ~1 < z < ~1.5, for which the GALEX FUV band (1350-1800A) is sensitive only to rest wavelengths < 912 A. We subtract sky flux using control locations near each catalog galaxy. Using the HST/ACS EGS photometric catalog we veto galaxy and control locations near sources that might add spurious FUV flux. We normalize FUV flux using NUV flux to derive the Lyman continuum emission escape fraction. We use various galaxy attributes from DEEP2 spectra and other data to bin galaxies to search for galaxy populations with higher escape fractions. Such a finding might shed light on differences in escape fraction measurements in the literature. We control for sources of spurious FUV flux and other sources of bias. To understand systematic errors we perform parametric studies of various parameters. These include control locations, minimum and maximum redshift, and veto parameters including distance.

GALEX (Galaxy Evolution Explorer) is a NASA Small Explorer, launched in April 2003. We gratefully acknowledge NASA's support for construction, operation, and science analysis for the GALEX mission.

This work has been proposed to be part of the Extended Groth Strip collaboration, which is supported by grants from the National Science Foundation, NASA, and the Keck Observatory.

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