Detection of nitric oxide in the dark cloud L134N

D. McGonagle; L. M. Ziurys; W. M. Irvine; Y. C. Minh

doi:10.1086/169040

Detection of nitric oxide in the dark cloud L134N

D. McGonagle
, L. M. Ziurys
, W. M. Irvine
, Y. C. Minh

Research output: Contribution to journal › Article › peer-review

56 Scopus citations

Abstract

We report the first detection of interstellar nitric oxide (NO) in a cold dark cloud, L134N. Nitric oxide was observed by means of its two ²Π_1/2, J = 3/2 → 1/2, rotational transitions at 150.2 and 150.5 GHz, which occur because of Λ-doubling. The inferred column density for L134N is N_NO ∼ 5 × 10¹⁴ cm^-2 toward the SO peak in that cloud. This value corresponds to a fractional abundance relative to molecular hydrogen of f_N0 ∼ 6 × 10^-8 and is in good agreement with predictions of quiescent cloud ion-molecule chemistry. NO was not detected toward the dark cloud TMC-1 at an upper limit of f_NO ≤ 3 ×10^-8.

Original language	English (US)
Pages (from-to)	121-124
Number of pages	4
Journal	Astrophysical Journal
Volume	359
Issue number	1
DOIs	https://doi.org/10.1086/169040
State	Published - Aug 10 1990

Keywords

Interstellar: molecules
Nebulae: abundances

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

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10.1086/169040

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title = "Detection of nitric oxide in the dark cloud L134N",

abstract = "We report the first detection of interstellar nitric oxide (NO) in a cold dark cloud, L134N. Nitric oxide was observed by means of its two 2Π1/2, J = 3/2 → 1/2, rotational transitions at 150.2 and 150.5 GHz, which occur because of Λ-doubling. The inferred column density for L134N is NNO ∼ 5 {\texttimes} 1014 cm-2 toward the SO peak in that cloud. This value corresponds to a fractional abundance relative to molecular hydrogen of fN0 ∼ 6 {\texttimes} 10-8 and is in good agreement with predictions of quiescent cloud ion-molecule chemistry. NO was not detected toward the dark cloud TMC-1 at an upper limit of fNO ≤ 3 {\texttimes}10-8.",

keywords = "Interstellar: molecules, Nebulae: abundances",

author = "D. McGonagle and Ziurys, \{L. M.\} and Irvine, \{W. M.\} and Minh, \{Y. C.\}",

year = "1990",

month = aug,

day = "10",

doi = "10.1086/169040",

language = "English (US)",

volume = "359",

pages = "121--124",

journal = "Astrophysical Journal",

issn = "0004-637X",

publisher = "American Astronomical Society",

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TY - JOUR

T1 - Detection of nitric oxide in the dark cloud L134N

AU - McGonagle, D.

AU - Ziurys, L. M.

AU - Irvine, W. M.

AU - Minh, Y. C.

PY - 1990/8/10

Y1 - 1990/8/10

N2 - We report the first detection of interstellar nitric oxide (NO) in a cold dark cloud, L134N. Nitric oxide was observed by means of its two 2Π1/2, J = 3/2 → 1/2, rotational transitions at 150.2 and 150.5 GHz, which occur because of Λ-doubling. The inferred column density for L134N is NNO ∼ 5 × 1014 cm-2 toward the SO peak in that cloud. This value corresponds to a fractional abundance relative to molecular hydrogen of fN0 ∼ 6 × 10-8 and is in good agreement with predictions of quiescent cloud ion-molecule chemistry. NO was not detected toward the dark cloud TMC-1 at an upper limit of fNO ≤ 3 ×10-8.

AB - We report the first detection of interstellar nitric oxide (NO) in a cold dark cloud, L134N. Nitric oxide was observed by means of its two 2Π1/2, J = 3/2 → 1/2, rotational transitions at 150.2 and 150.5 GHz, which occur because of Λ-doubling. The inferred column density for L134N is NNO ∼ 5 × 1014 cm-2 toward the SO peak in that cloud. This value corresponds to a fractional abundance relative to molecular hydrogen of fN0 ∼ 6 × 10-8 and is in good agreement with predictions of quiescent cloud ion-molecule chemistry. NO was not detected toward the dark cloud TMC-1 at an upper limit of fNO ≤ 3 ×10-8.

KW - Interstellar: molecules

KW - Nebulae: abundances

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U2 - 10.1086/169040

DO - 10.1086/169040

M3 - Article

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AN - SCOPUS:0025704694

SN - 0004-637X

VL - 359

SP - 121

EP - 124

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 1

ER -

Detection of nitric oxide in the dark cloud L134N

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Keywords

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