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Detection of HF Tow...
Detection of HF Toward PKS 1830-211, Search for Interstellar H2F+, and Laboratory Study of H2F+ and H2Cl+ Dissociative Recombination
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- Kawaguchi, K. (author)
- Okayama University
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- Muller, Sebastien, 1976 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Black, John H, 1949 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Amano, T. (author)
- University of Waterloo
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- Matsushima, F. (author)
- University of Toyama
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- Fujimori, R. (author)
- Nagoya University
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- Okabayahsi, Y. (author)
- Okayama University
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- Nagahiro, H. (author)
- Okayama University
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- Miyamoto, Y. (author)
- Okayama University
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- Tang, J. (author)
- Okayama University
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(creator_code:org_t)
- 2016
- 2016
- English.
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In: Astrophysical Journal. - 1538-4357 .- 0004-637X. ; 822:2, s. Art. no. 115-
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Abstract
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- We report extragalactic observations of two fluorine-bearing species, hydrogen fluoride (HF) and fluoronium (H2F+), in the z = 0.89 absorber in front of the lensed blazar PKS 1830-211 with the Atacama Large Millimeter/submillimeter Array. HF was detected toward both southwest and northeast images of the blazar, with column densities >3.4 × 1014 cm-2 and 0.18 × 1014 cm-2, respectively. H2F+ was not detected, down to an upper limit (3?) of 8.8 × 1011 cm-2 and an abundance ratio of [H2F+]/[HF] 1/386. We also searched for H2F+ toward the Galactic sources NGC 6334 I and W51C, and toward Galactic center clouds with the Herschel HIFI spectrometer.6 The upper limit on the column density was derived to be 2.5 × 1011 cm-2 in NGC 6334 I, which is 1/68 of that for H2Cl+. In constrast, the ortho transition of H2Cl+ is detected toward PKS 1830-211. To understand the small abundance of interstellar H2F+, we carried out laboratory experiments to determine the rate constants for the ion-electron recombination reaction by infrared time-resolved spectroscopy. The constants determined are ke(209 K) = (1.1 ± 0.3) ×10-7 cm3 s-1 and (0.46 ± 0.05) ×10-7 cm3 s-1 for H2F+ and H2Cl+, respectively. The difference in the dissociative recombination rates between H2F+ and H2Cl+ by a factor ?2 and the cosmic abundance ratio [F]/[Cl] ? 1/6 are not enough to explain the much smaller abundance of H2F+. The difference in the formation mechanism of H2F+ and H2Cl+ in interstellar space would be a major factor in the small abundance of H2F+.
Subject headings
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Keyword
- methods: laboratory: molecular
- NGC 6334 I)
- ISM: individual objects (W31C
- galaxies: individual (PKS 1830-211)
- ISM: molecules
Publication and Content Type
- art (subject category)
- ref (subject category)
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Kawaguchi, K.
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Muller, Sebastie ...
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Black, John H, 1 ...
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Amano, T.
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Matsushima, F.
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Fujimori, R.
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Okabayahsi, Y.
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Nagahiro, H.
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Miyamoto, Y.
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Tang, J.
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- NATURAL SCIENCES
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NATURAL SCIENCES
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Astrophysical Jo ...
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Chalmers University of Technology