Extended Lyman-alpha Emission From Interacting Galaxies At High Redshifts

Details Extended Lyman-alpha Emission From Interacting Galaxies At High Redshifts Extended Lyman-alpha Emission From Interacting Galaxies At High Redshifts

May 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21840301y&link_type=abstract

American Astronomical Society, AAS Meeting #218, #403.01; Bulletin of the American Astronomical Society, Vol. 43, 2011

Astronomy and Astrophysics

Astronomy

Scientific paper

We investigate Lyman-alpha emission from high-redshift galaxies, by combining hydrodynamic simulations with three dimensional radiative transfer calculations. We focus on a set of major mergers of galaxies in the redshift range of z 3 -7, with a mass range of 2-5*10^{12} Msun. The hydrodynamic simulations include star formation, black hole growth, and feedback processes. The radiative transfer includes continuum emission, dust absorption and re-emission, ionization of neutral hydrogen, and Lyman-alpha emission from both recombination and collisional excitation.
We find that the intense star formation and enhanced cooling induced by gravitational interaction produce strong Lyman-alpha emission from these merging galaxies. The Lyman-alpha emission appear to be extended due to the extended distribution of sources and gas. Moreover, the presence of AGN in the system significantly increases the Lyman-alpha emission. During the close encounter of galaxy progenitors when the star formation rate peaks at 10^2 Msun/yr, our model produces a Lyman-alpha luminosity of L 10^{43} ergs/s and a size of D 20 kpc at z>6, while at z 3, L 10^{44} ergs/s and D 50 kpc. These results are in broad agreement with observations of Lyman-alpha blobs from redshifts z 3 - 6.6. Our model suggests that merging galaxies may produce the Lyman-alpha blobs observed at high redshifts.

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