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Abstract: We study the environmental dependence of local luminous infrared galaxiesLIRGs and ultraluminous infrared galaxies ULIRGs found in the Sloan DigitalSky Survey SDSS data. The LIRG and ULIRG samples are constructed bycross-correlating spectroscopic catalogs of galaxies of the SDSS Data Release 7and the Infrared Astronomical Satellite Faint Source Catalog. We examine theeffects of the large-scale background density Sigma 5, galaxy clusters, andthe nearest neighbor galaxy on the properties of infrared galaxies IRGs. Wefind that the fraction of LIRGs plus ULIRGs among IRGs f ULIRGs and theinfrared luminosity L IR of IRGs strongly depend on the morphology of and thedistance to the nearest neighbor galaxy: the probability for an IRG to be aULIRG f ULIRGs and its L IR both increase as it approaches a late-typegalaxy, but decrease as it approaches an early-type galaxy within half thevirial radius of its neighbor. We find no dependence of f ULIRGs on thebackground density surface galaxy number density at fixed stellar mass ofgalaxies. The dependence of f ULIRGs on the distance to galaxy clusters isalso found to be very weak, but in highest-density regions such as the centerof galaxy clusters, few ULIRGs are found. These environmental dependence ofLIRGs and ULIRGs and the evolution of star formation rate SFR-environmentrelation from high redshifts to low redshifts seem to support the idea thatgalaxy-galaxy interactions-merging play a critical role in triggering the starformation activity of LIRGs and ULIRGs.



Author: Ho Seong Hwang 1, David Elbaz 1, Jong Chul Lee 2, Woong-Seob Jeong 3, Changbom Park 4, Myung Gyoon Lee 2, Hyung Mok Lee 2 1 CEA S

Source: https://arxiv.org/







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