CO emission from the polar-ring S0 galaxy NGC 2685 and origin of the ring structure
Creators
- 1. Nobeyama Radio Observatory, Minamimaki (Japan)
- 2. Gifu Univ. (Japan)
- 3. Tokyo Univ., Mitaka (Japan)
- 4. Kiso Observatory (Japan)
Description
A CO emission line has been detected in the polar-ring S0 galaxy NGC 2685 and the possible origin of the circumnuclear molecular gas is discussed. It is suggested that the gas has been fed by the helix structure and may have little relation to the star-forming activity of the galaxy. As a formation mechanism of the helix and the faint outer ring of NGC 2685, a possibility of interaction with a distant partner UGC 4683 is suggested. The age of the helix and the outer ring is estimated to be more than 1 billion years, since such an interval of time is necessary for the formation of the ring structures and for the accumulation of molecular gas in the central 820 pc region of the galaxy. The accretion rate is estimated to be about 0.01 solar mass/yr. 46 refs
Additional details
Publishing Information
- Journal Title
- Astronomical Journal
- Journal Volume
- 100
- Series
- Astron. J.
- Journal Page Range
- 1086-1090
- ISSN
- 0004-6256
- CODEN
- ANJOA
INIS
- Country of Publication
- United States
- Country of Input or Organization
- United States
- INIS RN
- 22020992
- Subject category
- S79: ASTROPHYSICS, COSMOLOGY AND ASTRONOMY;
- Descriptors DEI
- AGE ESTIMATION; CARBON MONOXIDE; COSMIC GASES; GALAXIES; GRAVITATIONAL INTERACTIONS; MORPHOLOGICAL CHANGES; ORIGIN; RADIOASTRONOMY; RADIOWAVE RADIATION; SPIRAL CONFIGURATION; STAR ACCRETION
- Descriptors DEC
- ASTRONOMY; BASIC INTERACTIONS; CARBON COMPOUNDS; CARBON OXIDES; CHALCOGENIDES; CONFIGURATION; ELECTROMAGNETIC RADIATION; FLUIDS; GASES; OXIDES; OXYGEN COMPOUNDS; RADIATIONS; STAR EVOLUTION