Hydride spectroscopy of the diffuse interstellar medium: new clues on the gas fraction in molecular form and cosmic ray ionization rate in relation to H 3 + | Zendy

Maryvonne Gérin | Zendy; François Levrier | Zendy; É. Falgarone | Zendy; B. Godard | Zendy; P. Hennebelle | Zendy; Franck Le Petit | Zendy; M. De Luca | Zendy; David A. Neufeld | Zendy; Paule Sonnentrucker | Zendy; P. Goldsmith | Zendy; Nicolas Flagey | Zendy; D. C. Lis | Zendy; C. M. Persson | Zendy; J. H. Black | Zendy; J. R. Goicoechea | Zendy; K. M. Menten | Zendy

Open Access

Hydride spectroscopy of the diffuse interstellar medium: new clues on the gas fraction in molecular form and cosmic ray ionization rate in relation to H ₃ ⁺

Author(s) -

Maryvonne Gérin,

François Levrier,

É. Falgarone,

B. Godard,

P. Hennebelle,

Franck Le Petit,

M. De Luca,

David A. Neufeld,

Paule Sonnentrucker,

P. Goldsmith,

Nicolas Flagey,

D. C. Lis,

C. M. Persson,

J. H. Black,

J. R. Goicoechea,

K. M. Menten

Publication year - 2012

Publication title -

philosophical transactions of the royal society a mathematical physical and engineering sciences

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.074

H-Index - 169

eISSN - 1471-2962

pISSN - 1364-503X

DOI - 10.1098/rsta.2012.0023

Subject(s) - interstellar medium , physics , cosmic ray , ionization , astrophysics , interstellar cloud , spectral line , molecule , absorption spectroscopy , absorption (acoustics) , line (geometry) , astrochemistry , atomic physics , astronomy , galaxy , ion , quantum mechanics , geometry , mathematics , acoustics

The Herschel-guaranteed time key programme PRobing InterStellar Molecules with Absorption line Studies (PRISMAS)(1) 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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