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VLBI imaging of OH absorption
- Source :
- Monthly Notices of the Royal Astronomical Society, 353(4), 1055-1063. Oxford University Press
- Publication Year :
- 2004
-
Abstract
- Broad hydroxyl (OH) absorption-lines in the 1667 MHz and 1665 MHz transition towards the central region of NGC 3079 have been observed at high resolution with the European VLBI Network (EVN). Velocity fields of two OH absorption components were resolved across the unresolved nuclear radio continuum of ~10 parsecs. The velocity field of the OH absorption close to the systemic velocity shows rotation in nearly the same sense as the edge-on galactic-scale molecular disk probed by CO(1-0) emission. The velocity field of the blue-shifted OH absorption displays a gradient in almost the opposite direction. The blue-shifted velocity field represents a non-rotational component, which may trace an outflow from the nucleus, or material driven and shocked by the kiloparsec-scale superbubble. This OH absorption component traces a structure that does not support a counter-rotating disk suggested on the basis of the neutral hydrogen absorption.<br />Comment: 9 pages, 10 figures, submitted to MNRAS (03/12/2003)
- Subjects :
- SUPERBUBBLE
European VLBI Network
Astrophysics::High Energy Astrophysical Phenomena
galaxies : active
Continuum (design consultancy)
CIRCUMNUCLEAR TORUS
FOS: Physical sciences
Superbubble
Astrophysics
Astrophysics::Cosmology and Extragalactic Astrophysics
Rotation
PARSEC
galaxies : Seyfert
DISK
Very-long-baseline interferometry
galaxies : individual : NGC 3079
radio lines : galaxies
LOBE GALAXY NGC-3079
OUTFLOW
Absorption (electromagnetic radiation)
MASER EMISSION
Astrophysics::Galaxy Astrophysics
Physics
Astrophysics (astro-ph)
NGC 3079
Astronomy and Astrophysics
MOLECULAR GAS
Space and Planetary Science
JETS
Vector field
Outflow
galaxies : ISM
Subjects
Details
- Language :
- English
- ISSN :
- 00358711
- Volume :
- 353
- Issue :
- 4
- Database :
- OpenAIRE
- Journal :
- Monthly Notices of the Royal Astronomical Society
- Accession number :
- edsair.doi.dedup.....9377499480c0b5454fab4d14b4f483c5