The youngest stax-forming regions in galaxies: Giant compact HII regions and protoglobular clusters?

Details The youngest stax-forming regions in galaxies: Giant compact HII regions and protoglobular clusters? The youngest stax-forming regions in galaxies: Giant compact HII regions and protoglobular clusters?

Jan 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001iaus..205..224t&link_type=abstract

Galaxies and their Constituents at the Highest Angular Resolutions, Proceedings of IAU Symposium #205, held 15-18 August 2000 at

Computer Science

Scientific paper

Subarcsecond radio and infrared observations have recently revealed a class of luminous, obscured, and often optically thick HII regions associated with extremely large young clusters in nearby galaxies. VLA images of radio continuum emission in starburst and Wolf-Rayet galaxies show nebulae that are bright and dense, with ne ~ 103- 104 cm-3. The densities are characteristic of compact HII regions, but these nebulae are orders of magnitude larger than Galactic compact HII regions. The ionizing fluxes as well as the sizes and densities of the nebulae require the excitation equivalent of several thousand O stars within regions of 1-50 pc extent. From the O star population we estimate that the clusters are likely to have at least 100,000 stars, and as many as 106 stars. These very large clusters, possible protoglobular clusters, are likely to represent the conditions under which globular clusters form. The radio results have been confirmed with mid-infrared imaging at subarcsecond resolution, using the Long Wavelength Spectrometer on the Keck Telescope. The nebulae are also bright in the mid-infrared, and can often account for a significant fraction of the total IR luminosity of the parent galaxy. The prototype for these ``supernebulae" is the large, obscured cluster in the dwarf galaxy NGC 5253.

Affiliated with

Also associated with

No associations

Rating

The youngest stax-forming regions in galaxies: Giant compact HII regions and protoglobular clusters? 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 youngest stax-forming regions in galaxies: Giant compact HII regions and protoglobular clusters?, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The youngest stax-forming regions in galaxies: Giant compact HII regions and protoglobular clusters? will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1363135