Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...318..139b&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 318, July 1, 1987, p. 139-144.
Astronomy and Astrophysics
Astrophysics
32
Centimeter Waves, Emission Spectra, Galactic Nuclei, Galactic Rotation, Gas Dynamics, Hydroxyl Emission, Astronomical Spectroscopy, Interstellar Matter, Molecular Clouds, Radial Velocity, Radio Spectra
Scientific paper
All transitions of hedroxyl have been found in emission in IC 4553 (Arp 220). The line shapes have been decomposed and interpreted in terms of three distinct emission regions: one region at the systemic velocity of the galaxy, and a second at a 334 km/s higher velocity. A third region represents a nuclear outflow with a terminal velocity of approximately 700 km/s. The emission lines for the region I are the strongest and originate in a molecular disk surrounding the nucleus of the galaxy. The infalling foreground region II is thought to be rather extended and has a very prominennt 1612 MHz line. The line ratios of regions I and II are quite different indicating that, although the primary pump for both regions is the infrared radiation field, there are differences in the (secondary) excitation conditions. Regions I and II may represent the two nuclei of the galaxies, which make up the merging IC 4553. The excitation of region III is collisional.
Baan Willem A.
Haschick Aubrey David
No associations
LandOfFree
The 18 centimeter OH emission of IC 4553 (Arp 220) does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with The 18 centimeter OH emission of IC 4553 (Arp 220), we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The 18 centimeter OH emission of IC 4553 (Arp 220) will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-789568