Ionized Gas in Sagittarius B2 Main on Scales of 0.065 Arcsecond (600 AU)

Details Ionized Gas in Sagittarius B2 Main on Scales of 0.065 Arcsecond (600 AU) Ionized Gas in Sagittarius B2 Main on Scales of 0.065 Arcsecond (600 AU)

Jun 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998apj...500..847d&link_type=abstract

Astrophysical Journal v.500, p.847

Astronomy and Astrophysics

Astronomy

42

Ism: H Ii Regions, Ism: Individual Name: Sagittarius B2, Radio Continuum: Ism

Scientific paper

The ionized gas in the Sagittarius B2 Main star-forming region has been imaged with ~65 mas (600 AU) resolution using the Very Large Array (VLA) at 7 mm in the A configuration. These observations have ~4-5 times the resolution of the previous highest resolution images of this source. These VLA observations show that the central four ultracompact H II (UC H II) regions in Sgr B2 Main (F1, F2, F3, and F4) break up into ~20 separate UC H II regions. The individual sources have small resolved sizes (~10-3 pc), high derived emission measures (EM ~ 109 pc cm-6), and high rms electron densities (ne ~ 106 cm-3). We compare the observed radius and derived emission measure of each of these regions with those expected for a UC H II region in pressure equilibrium with its environment, using previously published temperatures and densities for the Sgr B2 molecular core (n_{{H}2}=2x107 cm-3). We find that the observed emission measures are in fact higher than those predicted in a simple pressure-confinement model, suggesting that the molecular densities on scales that confine the UC H II regions may be higher than 2 x 107 cm-3.

Affiliated with

Also associated with

No associations

Rating

Ionized Gas in Sagittarius B2 Main on Scales of 0.065 Arcsecond (600 AU) 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 Ionized Gas in Sagittarius B2 Main on Scales of 0.065 Arcsecond (600 AU), we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Ionized Gas in Sagittarius B2 Main on Scales of 0.065 Arcsecond (600 AU) will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1331363