Computer Science – Graphics
Scientific paper
Jan 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21911105j&link_type=abstract
American Astronomical Society, AAS Meeting #219, #111.05
Computer Science
Graphics
Scientific paper
Outflowing winds of gas and dust are important in regulating the star formation rate and metallicity of galaxies, enriching the intergalactic medium, and determining the escape fraction of Lyα and ionizing photons. We present results from a deep rest-frame ultraviolet spectroscopic survey of Lyman break galaxies (LBGs) at 3 < z < 7 focusing on the mean outflow properties at z=4. Composite spectra of LBGs are used to measure trends in low-ionization absorption lines, which arise in neutral outflowing gas. We compare these results with previous studies at z=3 and find that our sample at z=4 follows the same trends. Specifically, galaxies with fainter UV luminosities, bluer UV spectral slopes, lower stellar masses, and smaller half-light radii show on average weaker low-ionization absorption lines and stronger Lyα emission. The weaker absorption lines indicate a decrease in the covering fraction and/or velocity range of outflowing neutral gas, which in turn enables a higher escape fraction of Lyα photons. LBGs at z=4 show somewhat weaker low-ionization absorption and stronger Lyα than at z=3, consistent with differences in the average demographic properties. We expect galaxies at higher redshifts to show even stronger Lyα emission and weaker low-ionization absorption, based on the observed trends and the average demographics of high-redshift LBGs. We discuss these results in the context of the measured fraction of LBGs with strong Lyα emission at 3 < z < 8.
Ellis Richard
Jones Tucker
Stark Daniel
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