NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-04-21 T21:39:42 PDT
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For refcode 1992A&A...259..462L:
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Copyright by European Southern Observatory (ESO). Reproduced by permission
1992A&A...259..462L Infrared properties of interacting IRAS galaxies D. Lutz Max-Planck-Institut Fur Astronomie, Konigstuhl 17, W-6900 Heidelberg, Federal Republic of Germany Received March 21,1991; accepted March 14, 1992 Abstract. This paper presents near-infrared photometry and coadded IRAS data for a sample of 19 interacting and merging galaxy systems selected by IRAS flux and morphological criteria. The far-infrared activity L_FIR_/L_B_ rises with interaction strength. There are also changes in the far-infrared colors: log(f_12_/f_25_) is lower and log(f_60_/f_100_) higher for strong interactions. This behaviour can be understood in the context of two-component models of the far-infrared emission as an increase in the contribution of active star formation to the infrared activity. The near-infrared colors of the galaxies are studied, and the use of K-L color excesses to search for far-infrared emission is justified. The distribution of infrared activity in binary galaxies is analysed with the help of K-L color excesses and confirmed using IRAS data. Contrary to some earlier studies, it is found that enhanced activity in both components of an interacting system is frequent. The implications of this behaviour for the conditions necessary to trigger starbursts are discussed. The occurrence of a significant number of systems with infrared activity in both galaxies suggests that disturbances of the gaseous component leading to starbursts may be less sensitive to the relative orientation of the interacting galaxies than disturbances of the stellar component leading to prominent tidal tails. Key words: galaxies: evolution of - galaxies: structure of - infrared radiation
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