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Title: H I emission and absorption spectra towards the double radio source 1830-211
Authors: Subrahmanyan, Ravi
Kesteven, Michael J.
te Lintel Hekkert, Peter
Keywords: absorption spectra
emission spectra
gravitational lenses
h lines
radio sources (astronomy)
astronomical models
astronomical spectroscopy
milky way galaxy
Issue Date: Nov-1992
Publisher: Blackwell Publishing for the Royal Astronomical Society
Citation: Monthly Notices of the Royal Astronomical Society, 1992, Vol.259, p63
Abstract: The flat-spectrum 1-arcsec double radio source 1830-211 has anomalous spectral and structural properties that do not admit inclusion in any of the known subdivisions of conventional Galactic and extragalactic radio sources. We have observed the H I emission and absorption spectra due to Galactic neutral hydrogen towards the source. A comparison suggests that 1830-211 is extragalactic, consistent with the hypothesis that the source is an example of the gravitational lensing phenomenon. An unusual warm H I component with a spin temperature of about 1000 K has been detected towards the source. This H I fragment is either a peculiar-velocity cloud or else is located beyond the solar circle and about 2 kpc off the Galactic plane.
Description: Restricted Access.
ISSN: 0035-8711
1365-2966 (Online)
Alternative Location:
Copyright: 1992 Royal Astronomical Society
Appears in Collections:Research Papers (A&A)

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