Probing the Dark Matter-Galaxy Formation Connection with Lyman Alpha Emitting Galaxies

Details Probing the Dark Matter-Galaxy Formation Connection with Lyman Alpha Emitting Galaxies Probing the Dark Matter-Galaxy Formation Connection with Lyman Alpha Emitting Galaxies

Jan 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21331302g&link_type=abstract

American Astronomical Society, AAS Meeting #213, #313.02; Bulletin of the American Astronomical Society, Vol. 41, p.290

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Scientific paper

We probe the dark matter properties of high-redshift Lyman Alpha Emitting (LAE) galaxies and identify their present-day descendants. We studied the clustering properties and multiwavelength spectral energy distributions of a complete sample of 162 LAE
galaxies at z=3.1 discovered in deep narrow-band imaging of the MUSYC-ECDFS field. The LAEs exhibit a moderate clustering bias of b=1.7, which implies median dark matter halo masses of 10^11 M_sun. The evolution of galaxy bias with redshift predicts that z=3.1 LAEs evolve into typical present-day galaxies with L =L*, whereas other z>3 galaxy populations, including Lyman Break Galaxies and intermediate-luminosity Active Galactic Nuclei, typically evolve into more massive galaxies. A two-population fit to the LAE spectral energy distribution finds that the typical LAE has low stellar mass (10^9 M_sun), moderate star formation rate (2 M_sun/yr), a young component age of 20 Myr, and little dust (A_V<0.2). This represents our first direct knowledge of the progenitors of spiral galaxies like the Milky Way seen when the universe was only 2 Gyr in age.
References: Gawiser et al. 2007 (ApJ 671, 278), Gronwall et al. 2007 (ApJ 667, 79), Francke et al. 2008 (ApJL 673, 13)
We gratefully acknowledge financial support from the National Science Foundation, Department of Energy, and NASA.

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