Results 21 to 30 of about 2,475,342 (218)
Chemical complexity in the Horsehead photodissociation region [PDF]
Faraday Discuss., 2014 The interstellar medium is known to be chemically complex. Organic molecules with up to 11 atoms have been detected in the interstellar medium, and are believed to be formed on the ices around dust grains. The ices can be released into the gas-phase either through thermal desorption, when a newly formed star heats the medium around
Guzman, Viviana +7 more
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A photodissociation region study of NGC 4038 [PDF]
Monthly Notices of the Royal Astronomical Society, 2014 12 pages, 6 figures, 3 tables, to appear in ...
Bisbas, TG +5 more
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MAGNETIC FIELD STRENGTHS IN PHOTODISSOCIATION REGIONS [PDF]
The Astrophysical Journal, 2015 ABSTRACT We measure carbon radio recombination line (RRL) emission at 5.3 toward four H ii regions with the Green Bank Telescope to determine the magnetic field strength in the photodissociation region (PDR) that surrounds the ionized gas.
Dana S. Balser +5 more
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Unveiling the remarkable photodissociation region of Messier 8 [PDF]
Astronomy & Astrophysics, 2018 Aims. Messier 8 (M8) is one of the brightest HII regions in the sky. We collected an extensive dataset comprising multiple sub- millimeter spectral lines from neutral and ionized carbon and from CO. Based on this dataset, we aim to understand the morphology of M8 and that of its associated photodissociation region (PDR) and to carry out a quantitative ...
Tiwari, M. +7 more
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Photodissociation region diagnostics across galactic environments [PDF]
Monthly Notices of the Royal Astronomical Society, 2021 ABSTRACT We present three-dimensional astrochemical simulations and synthetic observations of magnetized, turbulent, self-gravitating molecular clouds. We explore various galactic interstellar medium environments, including cosmic ray ionization rates in the range of ζCR = 10−17–$10^{-14}\, {\rm s}^{-1}$, far-UV intensities in the range ...
Bisbas, Thomas G +2 more
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Raman mapping of photodissociation regions [PDF]
Monthly Notices of the Royal Astronomical Society, 2021 ABSTRACT Broad Raman-scattered wings of hydrogen lines can be used to map neutral gas illuminated by high-mass stars in star-forming regions. Raman scattering transforms far-ultraviolet starlight from the wings of the Lyβ line (1022–1029 Å) to red visual light in the wings of the Hα line (6400 –6700 Å).
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Photodissociation Regions - Part Two - a Model for the Orion Photodissociation Region
The Astrophysical Journal, 1985 On a construit un modele pour la region de photodissociation d'Orion. Il permet de rendre compte de l'emission observee dans les raies de structure fine de O I a 63 μm et a 145 μm, de C I a 609 μm et C II a 158 μm et des raies rotationnelles de CO. Il explique egalement l'emission H 2 1-0 S(1) etendue, les raies de recombinaison du carbone et la raie ...
A. G. G. M. Tielens, D. Hollenbach
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Photoevaporation of Clumps in Photodissociation Regions [PDF]
The Astrophysical Journal, 2002 To appear in the Astrophysical ...
Gorti, Uma, Hollenbach, David
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DENSE PHOTODISSOCIATION REGIONS (PDRs) [PDF]
Annual Review of Astronomy and Astrophysics, 1997 ▪ Abstract All neutral atomic hydrogen gas and a large fraction of the molecular gas in the Milky Way Galaxy and external galaxies lie in PDRs, and PDRs are the origin of most of the nonstellar infrared (IR) and the millimeter CO emission from a galaxy.
D. J. Hollenbach, A. G. G. M. Tielens
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