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Vibrationally Excit...
Vibrationally Excited Lines of HC3N Associated with the Molecular Disk around the G24.78+0.08 A1 Hypercompact H ii Region
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- Taniguchi, Kotomi (author)
- National Astronomical Observatory of Japan
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- Tanaka, Kei E.I. (author)
- National Astronomical Observatory of Japan,University of Colorado at Boulder
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- Zhang, Yichen (author)
- University of Virginia
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- Fedriani, Rubén, 1991 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Tan, Jonathan, 1973 (author)
- Chalmers tekniska högskola,Chalmers University of Technology,University of Virginia
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- Takakuwa, Shigehisa (author)
- Academia Sinica Taiwan,Kagoshima University
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- Nakamura, Fumitaka (author)
- University of Tokyo, Japan,The Graduate University for Advanced Studies (SOKENDAI),National Astronomical Observatory of Japan
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- Saito, Masao (author)
- National Astronomical Observatory of Japan,The Graduate University for Advanced Studies (SOKENDAI)
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- Majumdar, Liton (author)
- Homi Bhabha National Institute (HBNI),National Institute of Science Education and Research
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- Herbst, Eric (author)
- University of Virginia
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(creator_code:org_t)
- 2022-05-27
- 2022
- English.
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In: Astrophysical Journal. - : American Astronomical Society. - 1538-4357 .- 0004-637X. ; 931:2
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Abstract
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- We have analyzed Atacama Large Millimeter/submillimeter Array Band 6 data of the hypercompact H ii region G24.78+0.08 A1 (G24 HC H ii) and report the detection of vibrationally excited lines of HC3N (v (7) = 2, J = 24 - 23). The spatial distribution and kinematics of a vibrationally excited line of HC3N (v (7) = 2, J = 24 - 23, l = 2e) are found to be similar to the CH3CN vibrationally excited line (v (8) = 1), which indicates that the HC3N emission is tracing the disk around the G24 HC H ii region previously identified by the CH3CN lines. We derive the (CH3CN)-C-13/(HCCCN)-C-13 abundance ratios around G24 and compare them to the CH3CN/HC3N abundance ratios in disks around Herbig Ae and T Tauri stars. The (CH3CN)-C-13/(HCCCN)-C-13 ratios around G24 (similar to 3.0-3.5) are higher than the CH3CN/HC3N ratios in the other disks (similar to 0.03-0.11) by more than 1 order of magnitude. The higher CH3CN/HC3N ratios around G24 suggest that the thermal desorption of CH3CN in the hot dense gas and efficient destruction of HC3N in the region irradiated by the strong UV radiation are occurring. Our results indicate that the vibrationally excited HC3N lines can be used as a disk tracer of massive protostars at the HC H ii region stage, and the combination of these nitrile species will provide information of not only chemistry but also physical conditions of the disk structures.
Subject headings
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
- NATURVETENSKAP -- Fysik -- Atom- och molekylfysik och optik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Atom and Molecular Physics and Optics (hsv//eng)
- NATURVETENSKAP -- Fysik -- Annan fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Other Physics Topics (hsv//eng)
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Taniguchi, Kotom ...
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Tanaka, Kei E.I.
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Zhang, Yichen
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Fedriani, Rubén, ...
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Tan, Jonathan, 1 ...
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Takakuwa, Shigeh ...
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show more...
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Nakamura, Fumita ...
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Saito, Masao
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Majumdar, Liton
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Herbst, Eric
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
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and Astronomy Astrop ...
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
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and Atom and Molecul ...
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
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and Other Physics To ...
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Chalmers University of Technology