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arXiv · 1109.1937

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

H. S. Hwang·D. Elbaz·M. Dickinson·V. Charmandaris·E. Daddi·D. Le Borgne·V. Buat·G. E. Magdis·B. Altieri·H. Aussel·D. Coia·H. Dannerbauer·K. Dasyra·J. Kartaltepe·R. Leiton·B. Magnelli·P. Popesso·I. Valtchanov
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Abstract

We study the impact of galaxy-galaxy interactions on the FIR properties of galaxies and its evolution at 0 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.

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H. S. Hwang, D. Elbaz, M. Dickinson, V. Charmandaris, E. Daddi, D. Le Borgne, V. Buat, G. E. Magdis, B. Altieri, H. Aussel, D. Coia, H. Dannerbauer, K. Dasyra, J. Kartaltepe, R. Leiton, B. Magnelli, P. Popesso, I. Valtchanov. 2011-09-09. GOODS-Herschel: the impact of galaxy-galaxy interactions on the far-infrared properties of galaxies. https://doi.org/10.1051/0004-6361/201117476

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