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

Since the start of ALMA observatory operation, new and important chemistry ofinfrared cold core was revealed. Molecular transitions at millimeter range arebeing used to identify and to characterize these sources. We have investigatedthe 231 GHz ALMA archive observations of the infrared dark cloud region C9,focusing on the brighter source that we called as IRDC-C9 Main. We report theexistence of two sub-structures on the continuum map of this source: a compactbright spot with high chemistry diversity that we labelled as core, and aweaker and extended one, that we labelled as tail. In the core, we haveidentified lines of the molecules OCS(19-18), $^{13}$CS(5-4) andCH$_{3}$CH$_{2}$CN, several lines of CH$_{3}$CHO and the k-ladder emission of$^{13}$CH$_{3}$CN.We report two different temperature regions: while therotation diagram of CH$_{3}$CHO indicates a temperature of 25 K, the rotationdiagram of $^{13}$CH$_{3}$CN indicates a warmer phase at temperature of$\sim450$K. In the tail, only the OCS(19-18) and $^{13}$CS(5-4) lines weredetected. We used the $Nautilus$ and the \textsc{Radex} codes to estimate thecolumn densities and the abundances. The existence of hot gas in the core ofIRDC-C9 Main suggests the presence of a protostar, which is not present in thetail.

Sulphur-Bearing and Complex Organic Molecules in an Infrared Cold Core