The ALMA-ATOMS survey: Vibrationally excited HC${}_3$N lines in hot cores

Abstract

Interstellar molecules are excellent tools for studying the physical and chemical environments of massive star-forming regions. In particular, vibrationally excited HC${}_3$N (HC${}_3$N*) lines are the key tracers for probing hot cores environments. We present the Atacama Large Millimeter/submillimeter Array (ALMA) 3 mm observations of HC${}_3$N* lines in 60 hot cores, aiming to investigate how physical conditions affect the excitation of HC${}_3$N* transitions. We have used the XCLASS for line identification. Under the assumption of local thermodynamic equilibrium (LTE), we derived the rotation temperature and column density of HC${}_3$N* transitions in hot cores. Additionally, we calculated the H${}_2$ column density and number density, along with the abundance of HC${}_3$N* relative to H${}_2$, to enable a comparison of the physical properties of hot cores with different numbers of HC${}_3$N* states. We have detected HC${}_3$N* lines in 52 hot cores, in which 29 cores showing more than one vibrationally excited state. Hot cores with higher gas temperatures have more detections of these vibrationally excited lines. The excitation of HC${}_3$N* requires dense environments, with its spatial distribution influenced by the presence of UC Hii regions. The observed column density of HC${}_3$N* contributes to the number of HC${}_3$N* states in hot core environments. After analyzing the various factors influencing HC${}_3$N* excitation in hot cores, we conclude that the excitation of HC${}_3$N* is mainly driven by mid-IR pumping, while collisional excitation is ineffective.

14 pages, 9 figures

References in corpus (24)

• CASA, the Common Astronomy Software Applications for Radio Astronomy
• MAMBO Mapping of Spitzer c2d Small Clouds and Cores
• Astrochemistry During the Formation of Stars
• ATOMS: ALMA Three-millimeter Observations of Massive Star-forming regions -- I. Survey description and a first look at G9.62+0.19
• Galactocentric variation of the gas-to-dust ratio and its relation with metallicity
• ALCHEMI: an ALMA Comprehensive High-resolution Extragalactic Molecular Inventory. Survey presentation and first results from the ACA array
• ATOMS:ALMA Three-millimeter Observations of Massive Star-forming regions -- III :Catalogues of candidate hot molecular cores and Hyper/Ultra compact HII regions
• ALMA Observations of Massive Clouds in the Central Molecular Zone: Jeans Fragmentation and Cluster Formation
• New N-bearing species towards OH231.8+4.2: HNCO, HNCS, HC${}_3$N and NO
• ATOMS: ALMA Three-millimeter Observations of Massive Star-forming regions -- VIII. A search for hot cores by using C${}_2$H${}_5$CN, CH${}_3$OCHO and CH${}_3$OH lines
• Digging into the Interior of Hot Cores with ALMA (DIHCA). III: The Chemical Link between NH${}_2$CHO, HNCO, and H${}_2$CO
• ATOMS: ALMA Three-millimeter Observations of Massive Star-forming regions -- XII: Fragmentation and multi-scale gas kinematics in protoclusters G12.42+0.50 and G19.88-0.53
• A Massive Star is Born: How Feedback from Stellar Winds, Radiation Pressure, and Collimated Outflows Limits Accretion onto Massive Stars
• ALMA-IMF XI: The sample of hot core candidates A rich population of young high-mass proto-stars unveiled by the emission of methyl formate
• Mass-size scaling M~ r^1.67 of massive star-forming clumps -- evidences of turbulence-regulated gravitational collapse
• Vibrationally excited HC3N emission in NGC1068: Tracing the recent star formation in the starburst ring
• A multiwavelength study of the W33 Main ultracompact HII region
• Extended HNCO, SiO, and HC${}_3$N emission in 43 southern star-forming regions
• Infall in massive clumps harboring bright infrared sources
• Millimeter Spectral Line Mapping Observations Toward Four Massive Star Forming HII Regions
• Molecular Oxygen in the nearest QSO Mrk 231
• Vibrationally-excited Lines of HC${}_3$N Associated with the Molecular Disk around the G24.78+0.08 A1 Hyper-compact H${}_{\mathrm{II}}$ Region
• Chemical Evolution of HC3N in Dense Molecular Clouds
• ALMA discovery of a dual dense probably rotating outflow from a massive young stellar object G18.88MME

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