Other
Scientific paper
May 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000rmxac...9..169k&link_type=abstract
"Astrophysical Plasmas: Codes, Models, and Observations, Proceedings of the conference held in Mexico City, October 25-29, 1999,
Other
12
Scientific paper
The designation ``ultracompact H II region'' first appeared in the astronomical literature over 30 years ago. Since that time, of order 103 actual or candidate ultracompact (UC) H II regions have been identified, and no fewer than seven theoretical models have been proposed to describe them. Recent observational evidence suggests that the conventional ``UC H II'' classification may not be adequate to describe all of the small, dense nebulae surrounding young, massive stars. In particular, it appears that some UC H II regions may be small, high density regions that are integral parts of much larger structures; these we call ``UC H II regions with extended emission''. Other H II regions appear to be an order of magnitude smaller and two orders of magnitude denser than traditional UC H II regions, and hence are deserving of a new classification. We designate these as ``super-ultracompact H II regions'', (though we suspect that ``hypercompact'' will prevail). We provide brief scientific and historical perspectives, present the new observational data and arguments for the new classifications, and briefly discuss possible implications for theoretical models of UC H II regions.
No associations
LandOfFree
Ultracompact H II Regions: New Challenges 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 Ultracompact H II Regions: New Challenges, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Ultracompact H II Regions: New Challenges will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1347189