Observations of 1.4-GHz HI and 1.667-GHz OH transitions in NGC 5793, a spiral galaxy with a very luminous radio nucleus
Open Access
- 1 August 1986
- journal article
- Published by Oxford University Press (OUP) in Monthly Notices of the Royal Astronomical Society
- Vol. 221 (3) , 537-542
- https://doi.org/10.1093/mnras/221.3.537
Abstract
VLA observations with a 4-arcsec beam show that the 1.4-GHz HI 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 HI/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.Keywords
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