Astronomy and Astrophysics – Astrophysics
Scientific paper
2003-10-22
Astron.Astrophys.414:857-872,2004
Astronomy and Astrophysics
Astrophysics
16 pages, 23 figures, accepted in Astronomy and Astrophysics
Scientific paper
10.1051/0004-6361:20031664
We present CO(1-0) and CO(2-1) maps of the LINER galaxy NGC7217, obtained with the IRAM interferometer, at 2.4"x1.9" and 1.2"x0.8" resolution respectively. The nuclear ring (at r=12"=0.8kpc) dominates the CO maps, and has a remarkable sharp surface density gradient at its inner edge. The latter is the site of the stellar/Halpha ring, while the CO emission ring extends farther or is broader (500-600pc). This means that the star formation has been more intense toward the inner edge of the CO ring, in a thin layer, just at the location of the high gas density gradient. In the CO(2-1) map, a central concentration inside 3" coincides with a spiral dust lane, clearly seen in the HST V-I color image. N-body simulations including gas dissipation and star formation are performed to better understand the nature of the nuclear ring observed. In the best model, the gas content was higher in the recent past (having been consumed via star formation), and the oval/spiral formed were more self-gravitating (abridged).
Baker Andrew Jordan
Boone Frederic
Combes François
Eckart Andreas
Englmaier P. P.
No associations
LandOfFree
Molecular Gas in NUclei of GAlaxies (NUGA): II. The Ringed LINER NGC7217 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 Molecular Gas in NUclei of GAlaxies (NUGA): II. The Ringed LINER NGC7217, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Molecular Gas in NUclei of GAlaxies (NUGA): II. The Ringed LINER NGC7217 will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-664457