Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21543312s&link_type=abstract
American Astronomical Society, AAS Meeting #215, #433.12; Bulletin of the American Astronomical Society, Vol. 42, p.371
Astronomy and Astrophysics
Astronomy
Scientific paper
On June 12, 2009, a largely unexplored region of frequency space was (temporarily) opened up to radio astronomers when US TV stations were mandated to switch from analog transmissions to new frequency allocations for digital transmission. This freed up the spectral region between 700-800 MHz for a limited period (i.e. until new radio services allocated to this band begin operating), and Arecibo Observatory has produced a suitable receiver to allow astronomers to exploit this opportunity. We have begun a search within this band for highly redshifted HI and OH absorption against the continuum emission from 29 Compact-Steep-Spectrum/GHz-Peaked-Spectrum (CSS/GPS) radio sources of appropriate redshift. Such absorption would arise within the host galaxies. The first source observed, the quasar CTA 21 (4C16.09), shows strong HI absorption of optical depth 0.035. The detected line has a deep core absorption, with a strong wing extending to the blue. The recently determined optical redshift for this galaxy (z 0.907; Labiano et al, 2007) is confirmed.
Chandola Yogesh
Ghosh Tamal
Minchin Robert
Saikia D. J.
Salter Christopher J.
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