A Cold HII Region in the Molecular Globule G70.7+1.2

Details A Cold HII Region in the Molecular Globule G70.7+1.2 A Cold HII Region in the Molecular Globule G70.7+1.2

May 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aas...182.6009p&link_type=abstract

American Astronomical Society, 182nd AAS Meeting, #60.09; Bulletin of the American Astronomical Society, Vol. 25, p.898

Astronomy and Astrophysics

Astronomy

Scientific paper

We have observed an unusual lambda 22 cm radio recombination line from the molecular globule G70.7+1.2 using the Arecibo radio telescope and have mapped the radio nebula at 99 GHz with the Owens Valley millimeter interferometer. The H168alpha spectrum is dominated by a narrow emission line (FWHM 3 km/s) from gas cooler than 185 K, which makes G70.7+1.2 the coolest known HII region. Energy balance arguments suggest that the cold gas was ionized <~ 100 years ago. Recent work shows that a B[e] emission line star is moving through the molecular cloud at supersonic velocity and is preceded by a bow shock typical of compact, cometary HII regions. Aperture synthesis mapping revealed continuum emission from the bow shock and from an HII region of ~ 0.1 pc diameter near the emission line star. We speculate that the narrow recombination line could emanate from cold, ionized gas upstream from the bow shock or that the line may originate in a shell of newly ionized gas around a young and growing HII region.

Affiliated with

Also associated with

No associations

Rating

A Cold HII Region in the Molecular Globule G70.7+1.2 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 A Cold HII Region in the Molecular Globule G70.7+1.2, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and A Cold HII Region in the Molecular Globule G70.7+1.2 will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1850033