HI Absorption towards Compact Steep Spectrum Radio Sources

Details HI Absorption towards Compact Steep Spectrum Radio Sources HI Absorption towards Compact Steep Spectrum Radio Sources

May 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003aas...202.4210s&link_type=abstract

American Astronomical Society Meeting 202, #42.10; Bulletin of the American Astronomical Society, Vol. 35, p.760

Astronomy and Astrophysics

Astronomy

Scientific paper

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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