Were Progenitors of L* Galaxies Lyman-alpha Emitters At High Redshift?

Details Were Progenitors of L* Galaxies Lyman-alpha Emitters At High Redshift? Were Progenitors of L* Galaxies Lyman-alpha Emitters At High Redshift?

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21912906y&link_type=abstract

American Astronomical Society, AAS Meeting #219, #129.06

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The Lyman-alpha emission from galaxies has been observed over redshift z = 0 - 9. However, the link between high-redshift Lyman alpha emitters (LAEs) and local galaxies is largely unknown. Here, we investigate the Lya properties of progenitors of a local L* galaxy by combining cosmological hydrodynamic simulations and three-dimensional radiative transfer calculations.
We find that the modeled galaxies are Lya bright in the redshift range 0 < z < 10. In particular, their Lya luminosities are close to the observed characteristic LLya* of LAEs at z 2-6. Furthermore, the Lya emission by excitation cooling increases with redshift, accounting 50 % of the total at z > 6. Our results suggest that Lya emission from cold gas accretion dominates at high redshift, and that the observed LAEs at z 2-6 may evolve into a Milky Way-like galaxy at present day.

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