Emission Line Profiles of Lyman Alpha Emitting Galaxies at z=2.1 and z=3.1

Details Emission Line Profiles of Lyman Alpha Emitting Galaxies at z=2.1 and z=3.1 Emission Line Profiles of Lyman Alpha Emitting Galaxies at z=2.1 and z=3.1

Jan 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21740702g&link_type=abstract

American Astronomical Society, AAS Meeting #217, #407.02; Bulletin of the American Astronomical Society, Vol. 43, 2011

Astronomy and Astrophysics

Astronomy

Scientific paper

We obtained R=1400 VLT+FORS spectra covering 3500-5500 Angstroms for 30 Lyman Alpha Emitting (LAE) galaxies at z=2.1 and z=3.1. Our clustering analyses have revealed these LAEs to be progenitors of present-day L* galaxies like the Milky Way (Gawiser et al. 2007, Guaita et al. 2010a). Most of the Lyman alpha emission lines are resolved at this resolution, with a majority showing multiple velocity components that would appear to be a single component at the lower resolution and S/N of typical spectra. These profiles will be used to constrain models of the radiative transfer of resonantly scattered Ly alpha photons inside these galaxies. We also compare the Ly alpha redshifts with those of rest-ultraviolet interstellar absorption lines (Si II 1260, O I 1302, C II 1334, C IV 1550) to reveal the velocity offsets between the main Ly alpha emission component which comes from the away side of outflowing gas in galactic winds and the absorption originating from gas on the near side. The S/N is high enough to detect these interstellar absorption lines for a few objects, and we use spectral stacking to study them in the rest. Our unique survey design allows a direct comparison of the ISM properties of LAEs at z=2.1 and z=3.1, and we will present evidence for evolution in Lyman alpha emission profiles and velocity offsets between the two epochs. We gratefully acknowledge support from NSF, DOE and NASA.

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