The Spitzer Interacting Galaxies Survey: IRAC Evaluations of Star Formation

Mathematics – Logic

Scientific paper

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Scientific paper

With the Infrared Array Camera we have observed two well-defined and complementary samples of bright, nearby, interacting galaxies to seek evidence of any relationship between interaction strength and specific star formation rate (SFR). We used 8 μm non-stellar emission to measure SFRs in the Keel-complete (weakly interacting systems) and Keep-Arp (strong interaction) galaxy samples. With our complementary 3.6 μm observations we are able to measure stellar masses and thus derive specific star formation rates for all our sample galaxies. Although the data acquisition is still ongoing, on a statistical basis our analysis supports the conclusion that star formation rates are influenced by interaction strength. In particular, we conclude that galaxies involved in stronger interactions, defined by shorter separations and the presence of visually apparent morphological distortions, probably exhibit increased star formation rates.

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