• Radio continuum and far-infrared emission from the galaxies in the Eridanus group

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      https://www.ias.ac.in/article/fulltext/joaa/026/01/0089-0102

    • Keywords

       

      Galaxy: radio continuum, radio; FIR correlation; galaxies: groups; individual: Eridanus

    • Abstract

       

      The Eridanus galaxies follow the well-known radio—FIR correlation. The majority (70%) of these galaxies have their star formation rates below that of the Milky Way. The galaxies that have a significant excess of radio emission are identified as low luminosity AGNs based on their radio morphologies obtained from the GMRT observations. There are no powerful AGNs (L20cm > 1023 W Hz−1) in the group. The two most far-infrared and radio luminous galaxies in the group have optical and HI morphologies suggestive of recent tidal interactions. The Eridanus group also has two far-infrared luminous but radio-deficient galaxies. It is believed that these galaxies are observed within a few Myr of the onset of an intense star formation episode after being quiescent for at least a 100 Myr. The upper end of the radio luminosity distribution of the Eridanus galaxies (L20cm ∼ 1022 W Hz−1) is consistent with that of the field galaxies, other groups, and late-type galaxies in nearby clusters.

    • Author Affiliations

       

      A. Omar1 2 K. S. Dwarakanath1

      1. Raman Research Institute, Sadashivanagar, Bangalore - 560 080, India
      2. ARIES, Manora peak, Nainital, 263 129, Uttaranchal, India
    • Dates

       
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