The giant molecular cloud Monoceros R2. 1: Shell structure

Details The giant molecular cloud Monoceros R2. 1: Shell structure The giant molecular cloud Monoceros R2. 1: Shell structure

Jul 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...430..252x&link_type=abstract

The Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 430, no. 1, p. 252-255

Astronomy and Astrophysics

Astrophysics

18

H Ii Regions, Interstellar Matter, Molecular Clouds, Reflection Nebulae, Shell Galaxies, Space Observations (From Earth), Star Clusters, Star Formation, Stellar Evolution

Scientific paper

We have obtained a 45 sec resolution, Nyquist-sampled map in CO J = 1-0 covering approximately a 3 deg x 3 deg region of the giant molecular cloud Monoceros R2. The map consists of 167,000 spectra observed with the 15 element focal-plane array system on the FCRAO 14 m telescope. The data reveal that the large-scale structure of Mon R2 is dominated by a is approximately 30 pc diameter largely hemispherical shell containing approximately 4 x 104 solar mass of molecular material and expanding at approximately 3-4 km s-1 with symmetric axis roughly along the line of sight. The dynamical timescale of the shell is estimated to be approximately 4 x 106 yr, which is consistent with the age of main-sequence stars powering the clusters of reflection nebulea in this region. There is no evidence for a redshifted shell on the far side of the interior 'bubble,' which is largely devoid of molecular material. Distortions of the shell are obvious, suggesting inhomogeneity of the cloud and possible presence of a magnetic field prior to its formation. Dense clumps in Mon R2, including the main core and the GGD 12-15 core, appear to be condensations located on the large shell. The reflection nebulea with their illuminating stars as well as embedded IRAS sources suggest that triggered star formation has taken place over a large part of the Mon R2 shell.

Affiliated with

Also associated with

No associations

Rating

The giant molecular cloud Monoceros R2. 1: Shell structure 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 giant molecular cloud Monoceros R2. 1: Shell structure, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The giant molecular cloud Monoceros R2. 1: Shell structure will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1253276