H${}^{13}$CN-HN${}^{13}$C intensity ratio as a temperature indicator of interstellar clouds

Abstract

With the 30-m IRAM radio telescope, we observed several massive star forming regions at wavelengths of 3-4 and 2 mm. The temperature of the gas in the sources was estimated from the lines of CH${}_3$CCH and from the transitions of the NH${}_3$ molecule obtained during observations at the 100-m radio telescope in Effelsberg. As a result, a correlation between the integrated intensity ratios of the $J=1-0$ transitions of H${}^{13}$CN and HN${}^{13}$C and the kinetic temperature has been obtained. The obtained results allow us to propose the use of the intensity ratio H${}^{13}$CN-HN${}^{13}$C as a possible temperature indicator of interstellar clouds. We also compared the obtained estimates of the kinetic temperature with the dust temperature $T_{dust}$. As a result, no significant correlation was found.

16 pages, 7 figures, 2 tables, Accepted for publication in Astronomy Reports (2022)

References in corpus (6)

• The SCUBA Legacy Catalogue: Continuum Objects Detected by SCUBA
• Multi-temperature mapping of dust structures throughout the Galactic Plane using the PPMAP tool with Herschel Hi-GAL data
• The HNC/HCN Ratio in Star-Forming Regions
• HCN/HNC intensity ratio: a new chemical thermometer for the molecular ISM
• Supersonic turbulence, filamentary accretion,and the rapid assembly of massive stars and disks
• The Cygnus Allscale Survey of Chemistry and Dynamical Environments: CASCADE: Overview and first results toward DR20 from the Max Planck IRAM Observatory program (MIOP)

Cited by in corpus (4)

• Variations of the HCO${}^{+}$, HCN, HNC, N${}_2$H${}^{+}$ and NH${}_3$ deuterium fractionation in high-mass star-forming regions
• H2CN/H2NC abundance ratio: a new potential temperature tracer for the interstellar medium
• The factors that influence protostellar multiplicity I: Gas temperature, density, and mass in Perseus with Nobeyama
• The Cygnus Allscale Survey of Chemistry and Dynamical Environments: CASCADE III. The large scale distribution of DCO+, DNC and DCN in the DR21 filament