Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986mnras.221..537g&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 221, Aug. 1, 1986, p. 537-542.
Astronomy and Astrophysics
Astronomy
7
Galactic Nuclei, Hydroxyl Radicals, Luminosity, Radio Astronomy, Radio Spectra, Spiral Galaxies, Absorption Spectra, Continuous Spectra, Hydrogen Ions, Spectral Line Width
Scientific paper
VLA observations with a 4-arcsec beam show that the 1.4-GHz H I and 1.667-GHz OH transitions associated with the edge-on galaxy NGC 5793 are seen in absorption against a radio continuum source, of angular extent possibly as small as 0.3 arcsec, located near the nucleus. The presence of a narrow-band 'maser' feature in the OH line profile has been confirmed. Any systematic variation of absorbing cloud position with velocity is under 0.05 arcsec. This, together with an H I/OH ratio that varies systematically with velocity, suggests that the 200 km s-1 range in velocity for the absorption is more likely the result of a series of clouds along the line-of-sight with inflowing or outflowing motions than of clouds with a systematic rotation about the nucleus.
Gardner Frank F.
Whiteoak John B.
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