Atomic hydrogen in the powerful radio-infrared galaxies 4C 12.50 and 3C 433

Astronomy and Astrophysics – Astronomy

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Astronomical Spectroscopy, Cold Gas, Hydrogen Atoms, Infrared Sources (Astronomy), Radio Galaxies, Spiral Galaxies, Absorption Spectra, Galactic Evolution, Radio Jets (Astronomy), Red Shift

Scientific paper

The 21-cm line of atomic hydrogen was detected in absorption in 4C 12.50 and 3C 433, two galaxies at redshifts beyond 0.1 that have radio powers comparable to that of radio-loud quasars. The column densities of N(H I) = 2-7 x 10 to the 18th T(s) atoms/sq cm with line extents of almost 1000 km/s are indicative of large amounts of turbulent cold gas in these two systems of merging galaxies. The peculiar radio morphologies of 4C 12.50 and 3C 433 result from confinement and bending of the radio jets by the high-density ambient gas. 4C 12.50 rivals IC 4553 (Arp 220) in infrared and interstellar gas properties, and it is the best instance to study the evolutionary link between ultraluminous infrared galaxies and powerful radio galaxies.

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