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Hi Absorption in GPS/CSS Sources

Published online by Cambridge University Press:  05 March 2013

Ylva Pihlström ,
John Conway  and
Rene Vermeulen
Ylva Pihlström
Affiliation:
NRAO, PO Box O, Socorro, NM 87801, USA. ypihlstr@nrao.edu
John Conway
Affiliation:
Onsala Space Observatory, S-439 92 Onsala, Sweden. jconway@oso.chalmers.se
Rene Vermeulen
Affiliation:
NRAO, PO Box O, Socorro, NM 87801, USA. ypihlstr@nrao.edu
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Abstract

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Combining our own observations with data from the literature, we consider the incidence of HI absorption in gigahertz peaked spectrum (GPS) and compact steep spectrum (CSS) sources. Here we present our preliminary results, where we find that the smaller GPS sources (<1 kpc) on average have larger HI column densities than the larger CSS sources (>1 kpc). Both a spherical and an axi-symmetric gas distribution, with a radial power law density profile, can be used to explain this anti-correlation between projected linear size and HI column density. Since most detections occur in galaxy classified objects, we argue that if the unified schemes apply to the GPS/CSS sources, a disk distribution for the HI is more likely.

Keywords

galaxies: activegalaxies: ISMradio lines: galaxies
Type
GPS/CSS Workshop
Information
Publications of the Astronomical Society of Australia , Volume 20 , Issue 1 , 2003 , pp. 62 - 64
Copyright
Copyright © Astronomical Society of Australia 2003

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