Suppression of Star Formation in Galaxy Pairs
Abstract
We investigate the suppression of star formation in galaxy pairs based on the isolated galaxy pair sample derived from the SDSS survey. By comparing the star formation rate between late-type galaxies in galaxy pairs and those in the isolated environment, we detect the signal of star formation suppression in galaxy pairs at dp < 100kpc and 200kpc < dp < 350kpc. The occurrence of star formation suppression in these late-type galaxies requires their companion galaxies to have an early-type morphology (ns > 2.5). Star formation suppression in wide galaxy pairs with 200kpc < dp < 350kpc mainly occurs in massive late-type galaxies, while in close galaxy pairs with dp < 100kpc, it only appears in late-type galaxies with a massive companion ( M > 11.0), nearly independent of their own stellar mass. Based on these findings, we infer that star formation suppression in wide galaxy pairs is actually a result of galaxy conformity, while in close galaxy pairs, it stems from the influence of hot circum-galactic medium surrounding companion galaxies.
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