6 centimeter formaldehyde absorption toward the Sagittarius B star-forming complex

Details 6 centimeter formaldehyde absorption toward the Sagittarius B star-forming complex 6 centimeter formaldehyde absorption toward the Sagittarius B star-forming complex

Apr 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apjs...97..497m&link_type=abstract

Astrophysical Journal Supplement Series (ISSN 0067-0049), vol. 97, no. 2, p. 497-511

Astronomy and Astrophysics

Astronomy

27

Absorption Spectra, Formaldehyde, H Ii Regions, Interstellar Matter, Molecular Clouds, Radio Astronomy, Radio Spectra, Star Formation, Centimeter Waves, Opacity, Optical Thickness, Superhigh Frequencies, Very Large Array (Vla)

Scientific paper

Observations of the 6 cm transition of H2CO (formaldehyde) toward the Sgr B massive star-forming complex have been carried out using the Very Large Array (VLA). The purpose of this 15 sec resolution absorption study was to determine the parameters (e.g., velocities, optical depths, and line widths) of the molecular clouds that lie along the line of sight. The H2CO clouds studied have velocities in the range -130 km/s less than vLSR less than +130 km/s. The H2CO spectrum of Sgr B1 is very different from that of Sgr B2. The optical depths of the molecular clouds associated with Sgr B2 are greater than 1, while the opacities are less than 1 for the molecular clouds associated with Sgr B1. Thus, much of the molecular material in Sgr B1 seems to have dispersed, suggesting that Sgr B1 is more evolved than Sgr B2. This same conclusion was reached by Mehringer et al. on the basis of radio continuum observations. In Sgr B2, H2CO spectra vary dramatically from one position to another, which suggests that the H II regions lie at different depths within the clouds. Thus, several isolated events may have triggered star formation throughout Sgr B2, in contrast to many current models which suggest a single global event is responsible. The properties of a number of clouds which are in the central part of the Galaxy, but are not associated with the H II regions, are briefly discussed.

Affiliated with

Also associated with

No associations

Rating

6 centimeter formaldehyde absorption toward the Sagittarius B star-forming complex 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 6 centimeter formaldehyde absorption toward the Sagittarius B star-forming complex, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and 6 centimeter formaldehyde absorption toward the Sagittarius B star-forming complex will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1828857