Gerin, M. and Levrier, F. and Falgarone, E. and Godard, B. and Hennebelle, P. and Le Petit, F. and De Luca, M. and Neufeld, D. and Sonnentrucker, P. and Goldsmith, P. and Flagey, N. and Lis, D. C. and Persson, C. M. and Black, J. H. and Goicoechea, J. R. and Menten, K. M. (2012) Hydride spectroscopy of the diffuse interstellar medium: new clues on the gas fraction in molecular form and cosmic ray ionization rate in relation to H₃⁺. Philosophical Transactions A: Mathematical, Physical and Engineering Sciences, 370 (1978). pp. 5174-5185. ISSN 1364-503X. doi:10.1098/rsta.2012.0023. https://resolver.caltech.edu/CaltechAUTHORS:20200929-143508392
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Abstract
The Herschel-guaranteed time key programme PRobing InterStellar Molecules with Absorption line Studies (PRISMAS) is providing a survey of the interstellar hydrides containing the elements C, O, N, F and Cl. As the building blocks of interstellar molecules, hydrides provide key information on their formation pathways. They can also be used as tracers of important physical and chemical properties of the interstellar gas that are difficult to measure otherwise. This paper presents an analysis of two sight-lines investigated by the PRISMAS project, towards the star-forming regions W49N and W51. By combining the information extracted from the detected spectral lines, we present an analysis of the physical properties of the diffuse interstellar gas, including the electron abundance, the fraction of gas in molecular form, and constraints on the cosmic ray ionization rate and the gas density.
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| Additional Information: | © 2012 The Royal Society. Published online 13/11/2012; Published in print 13/11/2012. Theo Murphy Meeting Issue ‘Chemistry, astronomy and physics of H₃⁺’ organized and edited by Takeshi Oka. HIFI has been designed and built by a consortium of institutes and university departments from across Europe, Canada and the USA under the leadership of the SRON Netherlands Institute for Space Research, Groningen, The Netherlands, and with major contributions from Germany, France and the USA. Consortium members are: Canada: CSA, U. Waterloo. France: CESR, LAB, LERMA, IRAM. Germany: KOSMA, MPIfR, MPS. Ireland: NUI Maynooth. Italy: ASI, IFSI-INAF, Osservatorio Astrofisico di Arcetri-INAF. The Netherlands: SRON, TUD. Poland: CAMK, CBK. Spain: Observatorio Astronmico Nacional (IGN), Centro de Astrobiologa (CSIC-INTA). Sweden: Chalmers University of Technology - MC2, RSS & GARD; Onsala Space Observatory; Swedish National Space Board, Stockholm University-Stockholm Observatory. Switzerland: ETH Zurich, FHNW. USA: Caltech, JPL, NHSC. M.G., F.L., E.F., P.H. and M.D.L. acknowledge support from CNES and from the CNRS/INSU program PCMI. The chemical modelling is partly funded by grant no. ANR-09-BLAN-0231-01 from the French Agence Nationale de la Recherche as part of the SCHISM project. | ||||||||||||
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| Subject Keywords: | diffuse interstellar medium; W49N; W51 | ||||||||||||
| Issue or Number: | 1978 | ||||||||||||
| DOI: | 10.1098/rsta.2012.0023 | ||||||||||||
| Record Number: | CaltechAUTHORS:20200929-143508392 | ||||||||||||
| Persistent URL: | https://resolver.caltech.edu/CaltechAUTHORS:20200929-143508392 | ||||||||||||
| Official Citation: | Gerin M., Levrier F., Falgarone E., Godard B., Hennebelle P., Le Petit F., De Luca M., Neufeld D., Sonnentrucker P., Goldsmith P., Flagey N., Lis D. C., Persson C. M., Black J. H., Goicoechea J. R. and Menten K. M. 2012 Hydride spectroscopy of the diffuse interstellar medium: new clues on the gas fraction in molecular form and cosmic ray ionization rate in relation to H3+Phil. Trans. R. Soc. A. 370:5174–5185 http://doi.org/10.1098/rsta.2012.0023 | ||||||||||||
| Usage Policy: | No commercial reproduction, distribution, display or performance rights in this work are provided. | ||||||||||||
| ID Code: | 105655 | ||||||||||||
| Collection: | CaltechAUTHORS | ||||||||||||
| Deposited By: | George Porter | ||||||||||||
| Deposited On: | 30 Sep 2020 14:46 | ||||||||||||
| Last Modified: | 16 Nov 2021 18:45 |
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