Individual And Rest-frame Composite Spectra Of Lyα Emitting And Uv Continuum-selected Galaxies At 2<z<3.5

Details Individual And Rest-frame Composite Spectra Of Lyα Emitting And Uv Continuum-selected Galaxies At 2<z<3.5 Individual And Rest-frame Composite Spectra Of Lyα Emitting And Uv Continuum-selected Galaxies At 2<z<3.5

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21934012b&link_type=abstract

American Astronomical Society, AAS Meeting #219, #340.12

Astronomy and Astrophysics

Astronomy

Scientific paper

We present properties of individual and composite spectra of continuum- and narrowband-selected star-forming galaxies (SFGs) at a redshift of 220Å, the canonical limit to be classified as a Lyα emitting galaxy (LAE). We divide our dataset into subsamples based on properties we are able to measure for each individual galaxy: Lyα emission, rest-frame UV colors, and redshift. Among our subsample of galaxies with R<25.5, those with rest-frame WLyα>20Å have bluer UV continua, weaker low-ionization absorption lines, weaker C IV absorption, and stronger Si II* emission than those with WLyα<20Å. We measure a velocity offset of Δv 600 km/s between Lyα emission and interstellar absorption, which does not appear to vary substantially between the two subsamples. Through dividing the sample based on photometric colors whereby they are parameterized to represent intrinsic UV spectral slopes, we find that galaxies with bluer spectral slopes have stronger Lyα emission, weaker low-ionization absorption and more prominent nebular emission line profiles.

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