Counter-rotating gas disk in the S0 galaxy IC 560 |
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| Authors: | I S Proshina A Yu Kniazev O K Sil’chenko |
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| Institution: | 1.Sternberg Astronomical Institute,Moscow State University,Moscow,Russia;2.South African Astronomical Observatory,Cape Town,South Africa;3.Southern African Large Telescope (SALT),Cape Town,South Africa |
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| Abstract: | Acounter-rotating gas disk has been detected in the SA0 galaxy IC 560 located at the periphery of a sparse group of six late-type galaxies. The pattern of gas excitation and mid-infrared colors are indicative of ongoing star formation within 1 kpc of the center. Outside the gas disk with star formation the large-scale stellar disk of the galaxy has an old age and a very low metallicity, Z/H] ≈ ?1. The source of external gas accretion onto IC 560 is undetected; the only option is a single infall of a companion rich in high-metallicity gas. |
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