Neutral hydrogen in the radio galaxy Centaurus A
Journal Article
·
· Sov. Astron. (Engl. Transl.); (United States)
OSTI ID:6229914
The 21-cm H I line in Cen A (NGC 5128) has been observed in absorption and emission with the RATAN-600 radio telescope at 2'.7 x 2/sup 0/ angular resolution. Radial velocities from + 395 to + 630 km/sec were investigated. Two new H I features have been detected in absorption and four in emission. The absorbing clouds at + 545 and + 562 km/sec are less than 2'.5 across and are probably located within the dust lane crossing the radio galaxy. The absorbing cloud at + 525 km/sec is much larger (11' or 14 kpc in diameter); it lies in front of the two internal radio sources and, together with the clouds observed in emission, appears to form an H I envelope with a mass of roughly-equal 1 x 10/sup 9/ M/sub sun/. This envelope has a mean radial velocity of + 570 km/sec and is centered between the northeast internal continuum component and the central source.
- Research Organization:
- Special Astrophysical Observatory, USSR Academy of Sciences, Nizhnii Arkhyz
- OSTI ID:
- 6229914
- Journal Information:
- Sov. Astron. (Engl. Transl.); (United States), Journal Name: Sov. Astron. (Engl. Transl.); (United States) Vol. 24:6; ISSN SAAJA
- Country of Publication:
- United States
- Language:
- English
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