Merger-Dominated High-Redshift LIRG Morphologies

Details Merger-Dominated High-Redshift LIRG Morphologies Merger-Dominated High-Redshift LIRG Morphologies

Jan 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21342423s&link_type=abstract

American Astronomical Society, AAS Meeting #213, #424.23; Bulletin of the American Astronomical Society, Vol. 41, p.250

Astronomy and Astrophysics

Astronomy

Scientific paper

We present a morphology study of high-redshift LIRGs in the GOODS field using a revised asymmetry method optimized for deep fields. By taking careful account of the importance of underlying structures in the sky background in accurate asymmetry measurements, our new method does not suffer from systematic bias and offers small uncertainties. By redshifting local LIRGs and low-redshift normal galaxies into different higher redshifts, we have found that the redshift-dependence of galaxy asymmetry is a function of the asymmetry itself, with larger corrections for more asymmetric objects. By applying the redshift-, IR-luminosity- and optical-brightness-dependent asymmetry corrections, we have found that high-redshift LIRGs are dominated by galaxy mergers, with merger fractions > 50% up to z=1.2. The IR luminosity functions of galaxy mergers are derived at different redshifts up to z=1.2. In contrast to the general IR galaxy population, galaxy mergers show larger evolution in density [(1+z)4.7(+0.0)(-0.5)] than in luminosity [(1+z)1.7(+0.1)(-0.4)]. The integral of the merger IR luminosity function indicates a dramatic evolution of the merger IR density [(1+z)6.3], and that the galaxy mergers start to dominate (>50%) the cosmic IR density at z > 1.1.

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