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(+)

Gerin, M.LERMA - Laboratoire d'Etudes du Rayonnement et de la Matiere en Astrophysique et Atmospheres, France (author)

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.

NATURVETENSKAP Fysik hsv//swe
NATURAL SCIENCES Physical Sciences hsv//eng
NATURVETENSKAP Fysik Astronomi, astrofysik och kosmologi hsv//swe
NATURAL SCIENCES Physical Sciences Astronomy, Astrophysics and Cosmology hsv//eng
nitrogen
W49N
diffuse interstellar medium
clouds
chloronium
g10.6-0.4 w31c
herschel/hifi observations
w49n
absorption-lines
regions
meudon pdr code
hydrides
sight-line
W51

Levrier, F.LERMA - Laboratoire d'Etudes du Rayonnement et de la Matiere en Astrophysique et Atmospheres, France (author)
Falgarone, E.LERMA - Laboratoire d'Etudes du Rayonnement et de la Matiere en Astrophysique et Atmospheres, France (author)
Godard, B.Centro de Astrobiologia (CAB) (author)
Hennebelle, P.LERMA - Laboratoire d'Etudes du Rayonnement et de la Matiere en Astrophysique et Atmospheres, France (author)
Le Petit, F.LERMA - Laboratoire d'Etudes du Rayonnement et de la Matiere en Astrophysique et Atmospheres, France (author)
de Luca, M.LERMA - Laboratoire d'Etudes du Rayonnement et de la Matiere en Astrophysique et Atmospheres, France (author)
Neufeld, D. A.Johns Hopkins University (author)
Sonnentrucker, P.Space Telescope Science Institute (STScI) (author)
Goldsmith, P. F. (author)
Flagey, N. (author)
Lis, D. C.California Institute of Technology (Caltech) (author)
Persson, Carina,1964Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)carina64 (author)
Black, John H,1949Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)jblack (author)
Goicoechea, J. R.Centro de Astrobiologia (CAB) (author)
Menten, K. M.Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG) (author)
LERMA - Laboratoire d'Etudes du Rayonnement et de la Matiere en Astrophysique et Atmospheres, FranceCentro de Astrobiologia (CAB) (creator_code:org_t)

In:Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences: The Royal Society370:1978, s. 5174-51851364-503X1471-2962

By the author/editor: Gerin, M.; Levrier, F.; Falgarone, E.; Godard, B.; Hennebelle, P.; Le Petit, F.; show more...; de Luca, M.; Neufeld, D. A.; Sonnentrucker, P ...; Goldsmith, P. F.; Flagey, N.; Lis, D. C.; Persson, Carina, ...; Black, John H, 1 ...; Goicoechea, J. R ...; Menten, K. M.; show less...

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NATURAL SCIENCES: NATURAL SCIENCES; and Physical Science ...; and Astronomy Astrop ...

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