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Gerin M, de Luca M, Lis DC, Kramer C, Navarro S, Neufeld D, Indriolo N, Godard B, Le Petit F, Peng R, Phillips TG, Roueff E. Determination of the Ortho to Para Ratio of H2Cl+ and H2O+ from Submillimeter Observations. J Phys Chem A 2013; 117:10018-26. [DOI: 10.1021/jp4004533] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Maryvonne Gerin
- LERMA, Observatoire de Paris, ENS, and UMR8112 du CNRS, 24 rue Lhomond,
Paris 75231 cedex 05, France
| | - Massimo de Luca
- LERMA, Observatoire de Paris, ENS, and UMR8112 du CNRS, 24 rue Lhomond,
Paris 75231 cedex 05, France
| | - Dariusz C. Lis
- MC301-17, Cahill Center for
Astronomy and Astrophysics, CalTech, Pasadena,
California 91125, United States
| | - Carsten Kramer
- IRAM, Instituto de RadioAstronomìa Milimétrica, Avenida Divina
Pastora, 7, Núcleo CentralE 18012 Granada, Spain
| | - Santiago Navarro
- IRAM, Instituto de RadioAstronomìa Milimétrica, Avenida Divina
Pastora, 7, Núcleo CentralE 18012 Granada, Spain
| | - David Neufeld
- Department of Physics
and Astronomy, Johns Hopkins University, 3400 North Charles Street, Baltimore, Maryland 21218, United States
| | - Nick Indriolo
- Department of Physics
and Astronomy, Johns Hopkins University, 3400 North Charles Street, Baltimore, Maryland 21218, United States
| | - Benjamin Godard
- LUTH, Observatoire de Paris and UMR8102 du CNRS, Place J. Janssen, 92190
Meudon, France
| | - Franck Le Petit
- LUTH, Observatoire de Paris and UMR8102 du CNRS, Place J. Janssen, 92190
Meudon, France
| | - Ruisheng Peng
- MC301-17, Cahill Center for
Astronomy and Astrophysics, CalTech, Pasadena,
California 91125, United States
| | - Thomas G. Phillips
- MC301-17, Cahill Center for
Astronomy and Astrophysics, CalTech, Pasadena,
California 91125, United States
| | - Evelyne Roueff
- LUTH, Observatoire de Paris and UMR8102 du CNRS, Place J. Janssen, 92190
Meudon, France
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Abstract
The great developments in the chemistry, astronomy and physics of H(3)(+) since 2006, which have led to this Royal Society Theo Murphy Meeting, are reviewed.
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Affiliation(s)
- Takeshi Oka
- Department of Astronomy and Astrophysics, The Enrico Fermi Institute, The University of Chicago, Chicago, IL 60637, USA.
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Lis DC, Schilke P, Bergin EA, Emprechtinger M. Hot, metastable hydronium ion in the Galactic centre: formation pumping in X-ray-irradiated gas? Philos Trans A Math Phys Eng Sci 2012; 370:5162-5173. [PMID: 23028163 DOI: 10.1098/rsta.2012.0025] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
With a 3.5 m diameter telescope passively cooled to approximately 80 K, and a science payload comprising two direct detection cameras/medium resolution imaging spectrometers (PACS and SPIRE) and a very high spectral resolution heterodyne spectrometer (HIFI), the Herschel Space Observatory is providing extraordinary observational opportunities in the 55-670 μm spectral range. HIFI has opened for the first time to high-resolution spectroscopy the submillimetre band that includes the fundamental rotational transitions of interstellar hydrides, the basic building blocks of astrochemistry. We discuss a recent HIFI discovery of metastable rotational transitions of the hydronium ion (protonated water, H(3)O(+)), with rotational level energies up to 1200 K above the ground state, in absorption towards Sagittarius B2(N) in the Galactic centre. Hydronium is an important molecular ion in the oxygen chemical network. Earlier HIFI observations have indicated a general deficiency of H(3)O(+) in the diffuse gas in the Galactic disc. The presence of hot H(3)O(+) towards Sagittarius B2(N) thus appears to be related to the unique physical conditions in the central molecular zone, manifested, for example, by the widespread presence of abundant H(3)(+). One intriguing theory for the high rotational temperature characterizing the population of the H(3)O(+) metastable levels may be formation pumping in molecular gas irradiated by X-rays emitted by the Galactic centre black hole. Alternatively, the pervasive presence of enhanced turbulence in the central molecular zone may give rise to shocks in the lower-density medium that is exposed to energetic radiation.
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Affiliation(s)
- Dariusz C Lis
- Cahill Center for Astronomy and Astrophysics 301-17, California Institute of Technology, Pasadena, CA 91125, USA.
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