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[42.10] HI Absorption towards Compact Steep Spectrum Radio Sources

C.J. Salter (NAIC, Arecibo Observatory, USA), S Jeyakumar (Physikaliche Institut, Koeln, Germany), D.J. Saikia (NCRA, TIFR, India), T Ghosh (NAIC, Arecibo Observatory, USA), J Stutzki (Physikaliches Institut, Koeln, Germany)

Compact Steep Spectrum (CSS) sources are a subclass of FRII radio sources having both linear sizes of less than ~20 kpc and steep high frequency radio spectra. Observational evidence implies that these objects are young, and asymmetrically distributed gas is found close to their nuclei. Previous investigations have shown a high incidence of HI absorption from within their host galaxies against the CSS continuum emission. Implied HI column densities are of the order of 10²⁰ cm^-2. A few CSSs have also been detected in CO and these objects offer the potential for investigating atomic and molecular gas at intermediate and high redshifts. Here, we present recent HI absorption spectra of CSSs taken with the Arecibo 305-m telescope, and discuss their implications for radio source models.

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Bulletin of the American Astronomical Society, 35 #3
© 2003. The American Astronomical Soceity.