Correlation between nuclear spin ratio of cyclic C3H2 and chemical evolution in TMC-1 cores

Yusuke Morisawa, Mizuho Fushitani, Yoshiyasu Kato, Hiromichi Hoshina, Zenzo Slmizu, Shiori Watanabe, Yuki Miyamoto, Yasuko Kasai, Kentarou Kawaguchi, Takamasa Momose

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

The ortho-to-para nuclear spin ratio of cyclopropenylidene (cyclic C 3H2) in TMC-1 cores was investigated using the 45 m radio telescope at Nobeyama Radio Observatory. We have observed four ortho lines (JK,KC = 212-101,312303, 321-312, and 3 30-321) and four para lines (JKaKc = 2 02-111, 211-202,2 20-211, and 322-313) of cyclic C3H2 in six cores in TMC-1. A statistical equilibrium analysis of the observed intensities revealed apparent correlation between the ortho-to-para ratio of cyclic C3H2 and chemical evolution of the molecular cloud; the ortho-to-para ratio in younger cores is less than 2, while that in older cores is close to the statistical ratio of 3. A simple chemical model calculation indicates that the correlation is ascribed to the conservation of nuclear spin angular momenta in chemical reactions relevant to the production, destruction, and reproduction of cyclic C3H 2. Since cyclic C3H2 has been observed in a variety of sources, the ortho-to-para ratio of cyclic C3H2 may be a useful probe of chemical evolution of molecular clouds.

Original languageEnglish
Pages (from-to)954-965
Number of pages12
JournalAstrophysical Journal
Volume642
Issue number2 I
DOIs
Publication statusPublished - May 10 2006
Externally publishedYes

Fingerprint

chemical evolution
nuclear spin
molecular clouds
radio
angular momentum
chemical reaction
radio telescopes
observatory
probe
destruction
conservation
chemical reactions
observatories
chemical
probes

Keywords

  • ISM: abundances
  • ISM: individual (TMC-1)
  • ISM: molecules

ASJC Scopus subject areas

  • Space and Planetary Science
  • Nuclear and High Energy Physics

Cite this

Morisawa, Y., Fushitani, M., Kato, Y., Hoshina, H., Slmizu, Z., Watanabe, S., ... Momose, T. (2006). Correlation between nuclear spin ratio of cyclic C3H2 and chemical evolution in TMC-1 cores. Astrophysical Journal, 642(2 I), 954-965. https://doi.org/10.1086/501041

Correlation between nuclear spin ratio of cyclic C3H2 and chemical evolution in TMC-1 cores. / Morisawa, Yusuke; Fushitani, Mizuho; Kato, Yoshiyasu; Hoshina, Hiromichi; Slmizu, Zenzo; Watanabe, Shiori; Miyamoto, Yuki; Kasai, Yasuko; Kawaguchi, Kentarou; Momose, Takamasa.

In: Astrophysical Journal, Vol. 642, No. 2 I, 10.05.2006, p. 954-965.

Research output: Contribution to journalArticle

Morisawa, Y, Fushitani, M, Kato, Y, Hoshina, H, Slmizu, Z, Watanabe, S, Miyamoto, Y, Kasai, Y, Kawaguchi, K & Momose, T 2006, 'Correlation between nuclear spin ratio of cyclic C3H2 and chemical evolution in TMC-1 cores', Astrophysical Journal, vol. 642, no. 2 I, pp. 954-965. https://doi.org/10.1086/501041
Morisawa Y, Fushitani M, Kato Y, Hoshina H, Slmizu Z, Watanabe S et al. Correlation between nuclear spin ratio of cyclic C3H2 and chemical evolution in TMC-1 cores. Astrophysical Journal. 2006 May 10;642(2 I):954-965. https://doi.org/10.1086/501041
Morisawa, Yusuke ; Fushitani, Mizuho ; Kato, Yoshiyasu ; Hoshina, Hiromichi ; Slmizu, Zenzo ; Watanabe, Shiori ; Miyamoto, Yuki ; Kasai, Yasuko ; Kawaguchi, Kentarou ; Momose, Takamasa. / Correlation between nuclear spin ratio of cyclic C3H2 and chemical evolution in TMC-1 cores. In: Astrophysical Journal. 2006 ; Vol. 642, No. 2 I. pp. 954-965.
@article{1ba6ed4d3f854c908644e18e60bf2950,
title = "Correlation between nuclear spin ratio of cyclic C3H2 and chemical evolution in TMC-1 cores",
abstract = "The ortho-to-para nuclear spin ratio of cyclopropenylidene (cyclic C 3H2) in TMC-1 cores was investigated using the 45 m radio telescope at Nobeyama Radio Observatory. We have observed four ortho lines (JK,KC = 212-101,312303, 321-312, and 3 30-321) and four para lines (JKaKc = 2 02-111, 211-202,2 20-211, and 322-313) of cyclic C3H2 in six cores in TMC-1. A statistical equilibrium analysis of the observed intensities revealed apparent correlation between the ortho-to-para ratio of cyclic C3H2 and chemical evolution of the molecular cloud; the ortho-to-para ratio in younger cores is less than 2, while that in older cores is close to the statistical ratio of 3. A simple chemical model calculation indicates that the correlation is ascribed to the conservation of nuclear spin angular momenta in chemical reactions relevant to the production, destruction, and reproduction of cyclic C3H 2. Since cyclic C3H2 has been observed in a variety of sources, the ortho-to-para ratio of cyclic C3H2 may be a useful probe of chemical evolution of molecular clouds.",
keywords = "ISM: abundances, ISM: individual (TMC-1), ISM: molecules",
author = "Yusuke Morisawa and Mizuho Fushitani and Yoshiyasu Kato and Hiromichi Hoshina and Zenzo Slmizu and Shiori Watanabe and Yuki Miyamoto and Yasuko Kasai and Kentarou Kawaguchi and Takamasa Momose",
year = "2006",
month = "5",
day = "10",
doi = "10.1086/501041",
language = "English",
volume = "642",
pages = "954--965",
journal = "Astrophysical Journal",
issn = "0004-637X",
publisher = "IOP Publishing Ltd.",
number = "2 I",

}

TY - JOUR

T1 - Correlation between nuclear spin ratio of cyclic C3H2 and chemical evolution in TMC-1 cores

AU - Morisawa, Yusuke

AU - Fushitani, Mizuho

AU - Kato, Yoshiyasu

AU - Hoshina, Hiromichi

AU - Slmizu, Zenzo

AU - Watanabe, Shiori

AU - Miyamoto, Yuki

AU - Kasai, Yasuko

AU - Kawaguchi, Kentarou

AU - Momose, Takamasa

PY - 2006/5/10

Y1 - 2006/5/10

N2 - The ortho-to-para nuclear spin ratio of cyclopropenylidene (cyclic C 3H2) in TMC-1 cores was investigated using the 45 m radio telescope at Nobeyama Radio Observatory. We have observed four ortho lines (JK,KC = 212-101,312303, 321-312, and 3 30-321) and four para lines (JKaKc = 2 02-111, 211-202,2 20-211, and 322-313) of cyclic C3H2 in six cores in TMC-1. A statistical equilibrium analysis of the observed intensities revealed apparent correlation between the ortho-to-para ratio of cyclic C3H2 and chemical evolution of the molecular cloud; the ortho-to-para ratio in younger cores is less than 2, while that in older cores is close to the statistical ratio of 3. A simple chemical model calculation indicates that the correlation is ascribed to the conservation of nuclear spin angular momenta in chemical reactions relevant to the production, destruction, and reproduction of cyclic C3H 2. Since cyclic C3H2 has been observed in a variety of sources, the ortho-to-para ratio of cyclic C3H2 may be a useful probe of chemical evolution of molecular clouds.

AB - The ortho-to-para nuclear spin ratio of cyclopropenylidene (cyclic C 3H2) in TMC-1 cores was investigated using the 45 m radio telescope at Nobeyama Radio Observatory. We have observed four ortho lines (JK,KC = 212-101,312303, 321-312, and 3 30-321) and four para lines (JKaKc = 2 02-111, 211-202,2 20-211, and 322-313) of cyclic C3H2 in six cores in TMC-1. A statistical equilibrium analysis of the observed intensities revealed apparent correlation between the ortho-to-para ratio of cyclic C3H2 and chemical evolution of the molecular cloud; the ortho-to-para ratio in younger cores is less than 2, while that in older cores is close to the statistical ratio of 3. A simple chemical model calculation indicates that the correlation is ascribed to the conservation of nuclear spin angular momenta in chemical reactions relevant to the production, destruction, and reproduction of cyclic C3H 2. Since cyclic C3H2 has been observed in a variety of sources, the ortho-to-para ratio of cyclic C3H2 may be a useful probe of chemical evolution of molecular clouds.

KW - ISM: abundances

KW - ISM: individual (TMC-1)

KW - ISM: molecules

UR - http://www.scopus.com/inward/record.url?scp=33746078855&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=33746078855&partnerID=8YFLogxK

U2 - 10.1086/501041

DO - 10.1086/501041

M3 - Article

VL - 642

SP - 954

EP - 965

JO - Astrophysical Journal

JF - Astrophysical Journal

SN - 0004-637X

IS - 2 I

ER -