Sökning: onr:"swepub:oai:research.chalmers.se:0c0b2cac-10c2-480a-bf4f-71fc95da0387" >
Detection of HF Tow...
Detection of HF Toward PKS 1830-211, Search for Interstellar H2F+, and Laboratory Study of H2F+ and H2Cl+ Dissociative Recombination
-
- Kawaguchi, K. (författare)
- Okayama University
-
- Muller, Sebastien, 1976 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology
-
- Black, John H, 1949 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology
-
visa fler...
-
- Amano, T. (författare)
- University of Waterloo
-
- Matsushima, F. (författare)
- University of Toyama
-
- Fujimori, R. (författare)
- Nagoya University
-
- Okabayahsi, Y. (författare)
- Okayama University
-
- Nagahiro, H. (författare)
- Okayama University
-
- Miyamoto, Y. (författare)
- Okayama University
-
- Tang, J. (författare)
- Okayama University
-
visa färre...
-
(creator_code:org_t)
- 2016
- 2016
- Engelska.
-
Ingår i: Astrophysical Journal. - 1538-4357 .- 0004-637X. ; 822:2, s. Art. no. 115-
- Relaterad länk:
-
http://publications.... (primary) (free)
-
visa fler...
-
https://doi.org/10.3...
-
https://research.cha...
-
visa färre...
Abstract
Ämnesord
Stäng
- 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+.
Ämnesord
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Nyckelord
- methods: laboratory: molecular
- NGC 6334 I)
- ISM: individual objects (W31C
- galaxies: individual (PKS 1830-211)
- ISM: molecules
Publikations- och innehållstyp
- art (ämneskategori)
- ref (ämneskategori)
Hitta via bibliotek
Till lärosätets databas
- Av författaren/redakt...
-
Kawaguchi, K.
-
Muller, Sebastie ...
-
Black, John H, 1 ...
-
Amano, T.
-
Matsushima, F.
-
Fujimori, R.
-
visa fler...
-
Okabayahsi, Y.
-
Nagahiro, H.
-
Miyamoto, Y.
-
Tang, J.
-
visa färre...
- Om ämnet
-
- NATURVETENSKAP
-
NATURVETENSKAP
-
och Fysik
-
och Astronomi astrof ...
- Artiklar i publikationen
-
Astrophysical Jo ...
- Av lärosätet
-
Chalmers tekniska högskola