Distribution of Colors within Local (U)LIRGS

Details Distribution of Colors within Local (U)LIRGS Distribution of Colors within Local (U)LIRGS

Jan 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21733530l&link_type=abstract

American Astronomical Society, AAS Meeting #217, #335.30; Bulletin of the American Astronomical Society, Vol. 43, 2011

Astronomy and Astrophysics

Astronomy

Scientific paper

Large scale optical surveys have allowed for a detailed study of the color distribution of low- redshift galaxies. Red passively evolving galaxies and blue starforming galaxies populate two distinct regions on color magnitude diagrams. Luminous and ulta-luminous infrared galaxies ((U)LIRGs, LIR > 1011 Lsol) are galaxies where intense infrared emission is fueled by mergers, star formation and AGN and may represent a sample of galaxies in transition between the blue cloud and red sequence. We focus on a local sample of (U)LIRGs (z < 0.088) selected from the Revised Bright Galaxies Sample where we have sufficient resolution to study them in detail. Using imaging data from the Great Observatories All-sky LIRG Survey (GOALS), the (U)LIRGs' colors are compared to the blue cloud and red sequence of normal galaxies. We examine how the color of the (U)LIRGs change as a function of infrared luminosity and further investigate the origin of their colors by dividing the galaxies in to an inner 0-2 kpc, middle 2-5 kpc and outer regions. By using the changing color as an indication of star-formation, we discuss how star-formation and color change within the galaxies throughout the merging process.

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