First Detection of 13CH+ (J=1-0)

Details First Detection of 13CH+ (J=1-0) First Detection of 13CH+ (J=1-0)

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005apj...634l.149f&link_type=abstract

The Astrophysical Journal, Volume 634, Issue 2, pp. L149-L152.

Astronomy and Astrophysics

Astronomy

18

Astrochemistry, Ism: Individual: Alphanumeric: G10.6-0.4, Ism: Kinematics And Dynamics, Ism: Molecules, Submillimeter, Turbulence

Scientific paper

We report the probable detection of the 13CH+ (1-0) line in absorption against the dust continuum emission of a bright star-forming region, G10.6-0.4. If the 13CH+ line velocity centroid is that of the H I gas seen in absorption, the rest frequency we determine is 830.132(3) GHz. This is to be compared to the value of 830.131 GHz derived from new direct spectroscopy laboratory measurements of 12CH+ (1-0) and scaling from 12CH+ (1-0) to 13CH+ (1-0). However, if the 13CH+ line originated in either the star-forming region or in the intervening molecular gas as traced by 12CO (1-0) emission, then the inferred rest frequency would be 830.107(1) or 830.193(4) GHz, respectively, both clearly out of the predicted range. We thus conclude that the 13CH+ line arises in a gas phase not traced by the 12CO (1-0) line but one containing a large column density of cold H I and rich enough in H2 to form CH+. Such properties are those of the cold neutral medium. The inferred column density is N(13CH+)=(2.2+/-0.4)×1012 cm-2, corresponding to N(CH+)=(8.8+/-1.7)×1013 cm-2 for an isotopic abundance ratio [12CH+]/[13CH+]=40. With some assumptions concerning the H2 content of the atomic gas, we estimate the total hydrogen column density in this velocity range and find a CH+ abundance relative to H about twice that in the solar neighborhood, as derived from optical absorption lines.

Affiliated with

Also associated with

No associations

Rating

First Detection of 13CH+ (J=1-0) 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 First Detection of 13CH+ (J=1-0), we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and First Detection of 13CH+ (J=1-0) will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1031208