paper

GOODS-Herschel: the impact of galaxy-galaxy interactions on the far-infrared properties of galaxies

arXiv:1109.1937 · doi:10.1051/0004-6361/201117476

Abstract

We study the impact of galaxy-galaxy interactions on the FIR properties of galaxies and its evolution at 0<z<1.2. Using the high-z galaxies in the fields of GOODS observed by Herschel in the framework of the GOODS-Herschel key program and the local IRAS or AKARI-selected galaxies in the field of SDSS DR7, we investigate the dependence of galaxy properties on the morphology of and the distance to the nearest neighbor galaxy. We find that the SFRs and the SSFRs of galaxies, on average, depend on the morphology of and the distance to the nearest neighbor galaxy in this redshift range. When a late-type galaxy has a close neighbor galaxy, the SFR and the SSFR increase as it approaches a late-type neighbor, which is supported by K-S and MC tests with a significance level of >99%. However, the SFR and the SSFR decrease or do not change much as it approaches an early-type neighbor. The bifurcations of SFRs and SSFRs depending on the neighbor's morphology seem to occur at R_n~0.5r_vir,nei, which is supported by K-S and MC tests with a significance level of >98%. For all redshift bins, the SSFRs of late-type galaxies interacting with late-type neighbors are increased by factors of about 1.8+/-0.7 and 4.0+/-1.2 compared to those of non-interacting galaxies when the pair separation is smaller than 0.5r_vir,nei and 0.1r_vir,nei, respectively. The Tdust of both local and high-z late-type galaxies strongly interacting with late-type neighbors (i.e. R_n < 0.1r_vir,nei) appears to be higher than that of non-interacting galaxies with a significance level of 96-99%. However, Tdust of local late-type galaxies strongly interacting with early-type neighbors seems to be lower than or similar to that of non-interacting galaxies. Our results suggest that galaxy-galaxy interactions and mergers have been strongly affecting the SFR and the dust properties of star-forming galaxies over at least 8 billion years.

10 pages, 6 figures. To appear in A&A

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