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 have surveyed a sample of massive star-forming regions located over arange of distances from the Galactic centre for methyl formate, HCOOCH$_{3}$,and its isotopologues H$^{13}$COOCH$_{3}$ and HCOO$^{13}$CH$_{3}$. Theobservations were carried out with the APEX telescope in the frequency range283.4--287.4~GHz. Based on the APEX observations, we report tentativedetections of the $^{13}$C-methyl formate isotopologue HCOO$^{13}$CH$_{3}$towards the following four massive star-forming regions: Sgr~B2(N-LMH),NGC~6334~IRS~1, W51 e2 and G19.61-0.23. In addition, we have used the 1~mm ALMAscience verification observations of Orion-KL and confirm the detection of the$^{13}$C-methyl formate species in Orion-KL and image its spatial distribution.Our analysis shows that the $^{12}$C/$^{13}$C isotope ratio in methyl formatetoward Orion-KL Compact Ridge and Hot Core-SW components (68.4$\pm$10.1 and71.4$\pm$7.8, respectively) are, for both the $^{13}$C-methyl formateisotopologues, commensurate with the average $^{12}$C/$^{13}$C ratio of COderived toward Orion-KL. Likewise, regarding the other sources, our results areconsistent with the $^{12}$C/$^{13}$C in CO. We also report the spectroscopiccharacterization, which includes a complete partition function, of the complexH$^{13}$COOCH$_{3}$ and HCOO$^{13}$CH$_{3}$ species. New spectroscopic data forboth isotopomers H$^{13}$COOCH$_{3}$ and HCOO$^{13}$CH$_{3}$, presented in thisstudy, has made it possible to measure this fundamentally important isotoperatio in a large organic molecule for the first time.

13C-methyl formate: observations of a sample of high mass star-forming regions including Orion-KL and spectroscopic characterization