A SEARCH FOR INTERSTELLAR CARBON-CHAIN ALCOHOL HC{sub 4}OH IN STAR-FORMING REGION L1527 AND DARK CLOUD TMC-1

Araki, Mitsunori; Yamabe, Hiromichi; Koshikawa, Naohiro; Tsukiyama, Koichi; Takano, Shuro; Nakane, Aya; Okabayashi, Toshiaki; Kunimatsu, Arisa; Kuze, Nobuhiko

doi:10.1088/0004-637X/744/2/163

Title: A SEARCH FOR INTERSTELLAR CARBON-CHAIN ALCOHOL HC{sub 4}OH IN STAR-FORMING REGION L1527 AND DARK CLOUD TMC-1

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Abstract

We report a sensitive search for the rotational transitions of the carbon-chain alcohol HC{sub 4}OH in the frequency range 21.2-46.7 GHz in the star-forming region L1527 and the dark cloud TMC-1. The motivation was laboratory detection of HC{sub 4}OH by microwave spectroscopy. Despite achieving rms noise levels of several millikelvin in the antenna temperature using the 45 m telescope at Nobeyama Radio Observatory, the detection was not successful, leading to 3{sigma} upper limits corresponding to the column densities of 2.0 Multiplication-Sign 10{sup 12} and 5.6 Multiplication-Sign 10{sup 12} cm{sup -2} in L1527 and TMC-1, respectively. These upper limits indicate that [HC{sub 4}OH]/[HC{sub 5}N] ratios are less than 0.3 and 0.1 in L1527 and TMC-1, respectively, where HC{sub 5}N is an HC{sub 4}-chain cyanide and HC{sub 4}OH is a hydroxide. These ratios suggest that the cyano carbon-chain molecule dominates the hydroxyl carbon-chain molecule in L1527 and TMC-1. This is contrary to the case of saturated compounds in hot cores, e.g., CH{sub 3}OH and CH{sub 3}CN, and can be a chemical feature of carbon-chain molecules in L1527 and TMC-1. In addition, the column densities of the 'unsubstituted' carbon-chain molecule C{sub 4}H and the sulfur-bearing molecules SO and HCS{sup +} were determined frommore » detected lines in L1527.« less

Authors:

Araki, Mitsunori; Yamabe, Hiromichi; Koshikawa, Naohiro; Tsukiyama, Koichi ^[1]; Takano, Shuro ^[2]; Nakane, Aya; Okabayashi, Toshiaki ^[3]; Kunimatsu, Arisa; Kuze, Nobuhiko ^[4]

Department of Chemistry, Faculty of Science Division I, Tokyo University of Science, 1-3 Kagurazaka, Shinjuku-ku 162-8601, Tokyo (Japan)
Nobeyama Radio Observatory, 462-2 Nobeyama, Minamimaki, Minamisaku, Nagano 384-1305 (Japan)
Department of Chemistry, Faculty of Science, Shizuoka University, 836 Oya, Suruga-ku, Shizuoka 422-8529 (Japan)
Department of Materials and Life Sciences, Faculty of Science and Technology, Sophia University, 7-1 Kioi-cho, Chiyoda-ku 102-8554, Tokyo (Japan)

Publication Date:: Tue Jan 10 00:00:00 EST 2012

OSTI Identifier:: 22004217

Resource Type:: Journal Article

Journal Name:: Astrophysical Journal

Additional Journal Information:: Journal Volume: 744; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0004-637X

Country of Publication:: United States

Language:: English

Subject:: 79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ACETONITRILE; CARBON; HYDROXIDES; METHANOL; MICROWAVE RADIATION; SPECTROSCOPY; STAR EVOLUTION; STARS; TELESCOPES

Citation Formats


                    Araki, Mitsunori, Yamabe, Hiromichi, Koshikawa, Naohiro, Tsukiyama, Koichi, Takano, Shuro, Nakane, Aya, Okabayashi, Toshiaki, Kunimatsu, Arisa, and Kuze, Nobuhiko. A SEARCH FOR INTERSTELLAR CARBON-CHAIN ALCOHOL HC{sub 4}OH IN STAR-FORMING REGION L1527 AND DARK CLOUD TMC-1.  United States: N. p., 2012. 
        Web.  doi:10.1088/0004-637X/744/2/163.

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                    Araki, Mitsunori, Yamabe, Hiromichi, Koshikawa, Naohiro, Tsukiyama, Koichi, Takano, Shuro, Nakane, Aya, Okabayashi, Toshiaki, Kunimatsu, Arisa, & Kuze, Nobuhiko. A SEARCH FOR INTERSTELLAR CARBON-CHAIN ALCOHOL HC{sub 4}OH IN STAR-FORMING REGION L1527 AND DARK CLOUD TMC-1.  United States.  https://doi.org/10.1088/0004-637X/744/2/163

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                    Araki, Mitsunori, Yamabe, Hiromichi, Koshikawa, Naohiro, Tsukiyama, Koichi, Takano, Shuro, Nakane, Aya, Okabayashi, Toshiaki, Kunimatsu, Arisa, and Kuze, Nobuhiko. 2012.  
        "A SEARCH FOR INTERSTELLAR CARBON-CHAIN ALCOHOL HC{sub 4}OH IN STAR-FORMING REGION L1527 AND DARK CLOUD TMC-1".  United States.  https://doi.org/10.1088/0004-637X/744/2/163.

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@article{osti_22004217,

  title        = {A SEARCH FOR INTERSTELLAR CARBON-CHAIN ALCOHOL HC{sub 4}OH IN STAR-FORMING REGION L1527 AND DARK CLOUD TMC-1},

  author       = {Araki, Mitsunori and Yamabe, Hiromichi and Koshikawa, Naohiro and Tsukiyama, Koichi and Takano, Shuro and Nakane, Aya and Okabayashi, Toshiaki and Kunimatsu, Arisa and Kuze, Nobuhiko},

  abstractNote = {We report a sensitive search for the rotational transitions of the carbon-chain alcohol HC{sub 4}OH in the frequency range 21.2-46.7 GHz in the star-forming region L1527 and the dark cloud TMC-1. The motivation was laboratory detection of HC{sub 4}OH by microwave spectroscopy. Despite achieving rms noise levels of several millikelvin in the antenna temperature using the 45 m telescope at Nobeyama Radio Observatory, the detection was not successful, leading to 3{sigma} upper limits corresponding to the column densities of 2.0 Multiplication-Sign 10{sup 12} and 5.6 Multiplication-Sign 10{sup 12} cm{sup -2} in L1527 and TMC-1, respectively. These upper limits indicate that [HC{sub 4}OH]/[HC{sub 5}N] ratios are less than 0.3 and 0.1 in L1527 and TMC-1, respectively, where HC{sub 5}N is an HC{sub 4}-chain cyanide and HC{sub 4}OH is a hydroxide. These ratios suggest that the cyano carbon-chain molecule dominates the hydroxyl carbon-chain molecule in L1527 and TMC-1. This is contrary to the case of saturated compounds in hot cores, e.g., CH{sub 3}OH and CH{sub 3}CN, and can be a chemical feature of carbon-chain molecules in L1527 and TMC-1. In addition, the column densities of the 'unsubstituted' carbon-chain molecule C{sub 4}H and the sulfur-bearing molecules SO and HCS{sup +} were determined from detected lines in L1527.},

  doi          = {10.1088/0004-637X/744/2/163},

  url          = {https://www.osti.gov/biblio/22004217},
  journal      = {Astrophysical Journal},

  issn         = {0004-637X},

  number       = 2,

  volume       = 744,

  place        = {United States},

  year         = {Tue Jan 10 00:00:00 EST 2012},

  month        = {Tue Jan 10 00:00:00 EST 2012}

}

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