The Ortho-to-Para Ratio and the Chemical Properties of C3 H2 in Dark Cloud Cores

Details The Ortho-to-Para Ratio and the Chemical Properties of C3 H2 in Dark Cloud Cores The Ortho-to-Para Ratio and the Chemical Properties of C3 H2 in Dark Cloud Cores

Apr 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001pasj...53..251t&link_type=abstract

Publications of the Astronomical Society of Japan, vol.53, no. 2, p. 251-257.

Astronomy and Astrophysics

Astronomy

8

Ism: Abundances, Ism: Individual (Tmc-1C, L 1527), Ism: Molecules

Scientific paper

We have observed cyclic C3H2 (JKaKc = 212-101, 202 - 111, 312 - 303) lines at the 3 mm wavelength region toward the starless TMC-1C cloud and the protostellar core of L 1527 with the 45 m telescope at Nobeyama Radio Observatory. In both clouds, the 212-101 and 202 - 111 lines are strongly detected, while the 312 - 303 line is only detected toward the center of the protostellar core L 1527. From our statistical equilibrium analyses of the ortho-C3H2(212-101) and the para-C3H2(202-111)lines, the ortho-to-para ratios of C3H2 are determined to be 2.4 +/- 0.1 and 2.5 +/- 0.5 in TMC-1C and L 1527, respectively. These values are lower than the statistical value of 3, although the error of the ratio in L 1527 is large. Since thermal equilibrium with a dust temperature of 10 K still gives a ratio of 3 in c-C3H2, this result should suggest the lower ortho-to-para ratio of the precursor molecule, c-C3H+3, which is thought to be mainly produced by C3H++H2. Thus, we conclude that the lower ortho-to-para ratio of c-C3H2 is due to a lower ortho-to-para ratio of H2 than the statistical value.

Affiliated with

Also associated with

No associations

Rating

The Ortho-to-Para Ratio and the Chemical Properties of C3 H2 in Dark Cloud Cores 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 Ortho-to-Para Ratio and the Chemical Properties of C3 H2 in Dark Cloud Cores, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The Ortho-to-Para Ratio and the Chemical Properties of C3 H2 in Dark Cloud Cores will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-962289