Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992mnras.259...63s&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 259, no. 1, p. 63-66.
Astronomy and Astrophysics
Astronomy
5
Absorption Spectra, Emission Spectra, Gravitational Lenses, H Lines, Radio Sources (Astronomy), Astronomical Models, Astronomical Spectroscopy, Milky Way Galaxy
Scientific paper
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.
Kesteven Michael J.
Subrahmanyan Ravi
te Lintel Hekkert Peter
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