New detections of HC${}_5$N toward hot cores associated with 6.7 GHz methanol masers

Abstract

We present new detections of cyanodiacetylene (HC${}_5$N) toward hot molecular cores, observed with the Tidbinbilla 34 m radio telescope (DSS-34). In a sample of 79 hot molecular cores, HC${}_5$N was detected towards 35. These results are counter to the expectation that long chain cyanopolyynes, such as HC${}_5$N, are not typically found in hot molecular cores, unlike their shorter chain counterpart HC${}_3$N. However it is consistent with recent models which suggest HC${}_5$N may exist for a limited period during the evolution of hot molecular cores.

13 pages, 7 figures. Accepted for publication in MNRAS, July 3 2014

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• Observations of Cyanopolyynes toward Four High-Mass Star-Forming Regions Containing Hot Cores
• Chemical Differentiation around Five Massive Protostars Revealed by ALMA -Carbon-Chain Species, Oxygen-/Nitrogen-Bearing Complex Organic Molecules-
• Carbon Chain Chemistry in Hot-Core Regions around Three Massive Young Stellar Objects Associated with 6.7 GHz Methanol Masers
• Cyanopolyyne line survey towards high-mass star-forming regions with TMRT
• The SOFIA Massive (SOMA) Star Formation Q-band follow-up I. Carbon-chain chemistry of intermediate-mass protostars
• Star Formation at the Periphery of a Molecular Superbubble: The Case of G12.79+0.43
• ATOMS: ALMA Three-millimeter Observations of Massive Star-forming regions -- X. Chemical differentiation among the massive cores in G9.62+0.19