Tracing the inner gas disks in starbursts and radio galaxies

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Scientific paper

Images of neutral hydrogen 21-cm absorption and radio continuum obtained at milli-arcsecond resolution using the Very Long Baseline Interferometry (VLBI) technique can trace gas disks on sub-kiloparsec scales in distant galaxies. Such disks may be common in the high-density environment conducive to starbursts. For example, in Mrk 273a, a gas disk with a diameter of 370 pc and an enclosed mass of 2 × 109 M&sun; is found by H I absorption. We also report on searches for gas disks in the starburst Mrk 231, in the radio galaxy 3C293, and in the gigamaser galaxy TXS2226-184.

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