English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

We report the first detection of the isotopologues 13CCC and C13CC. We usedthe heterodyne receivers GREAT and upGREAT on board SOFIA to search for thero-vibrational transitions Q(2) and Q(4) of 13CCC and C13CC at 1.9 THz alongthe line of sight towards SgrB2(M). For both species the ro-vibrationalabsorption lines Q(2) and Q(4) have been identified, primarily arising from thewarm gas physically associated with the strong continuum source SgrB2(M). Inaddition, to determine the local excitation temperature we analyzed data fromnine ro-vibrational transitions of the main isotopologue CCC in the frequencyrange between 1.6-1.9 THz which were taken from the Herschel Science DataArchive, and derived a gas excitation temperature of Tex = 44.4(+4.7/-3.9) Kand a total column density of N(CCC)=3.88(+0.39/-0.35)x10^15 cm^-2.  Assuming the excitation temperatures of C13CC and 13CCC to be the same as forCCC, we obtained column densities of the 13C-isotopologues of N(C13CC) =2.1(+0.9/-0.6)X10^14 cm^-2 and N(13CCC)=2.4(+1.2/-0.8)x10^14 cm^-2. The derived12C/13C abundance ratio in the C3 molecules is 20.5(4.2), which is in agreementwith the elemental ratio of 20, typically observed in SgrB2(M). However, wefind the N(13CCC) / N(C13CC) ratio to be 1.2(0.1), which is shifted from thestatistically expected value of 2. We propose that the discrepant abundanceratio arises due to the lower zero-point energy of C13CC which makes positionexchange reaction converting 13CCC to C13CC energetically favorable.

First detection of the carbon chain molecules 13CCC and C13CC towards SgrB2(M)