Results 21 to 30 of about 16,662 (218)

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, Bell, TA, Viti, S, Barlow, MJ, Yates, J, Vasta, M   +5 more
openaire   +3 more sources

Structure of the W3A Low-density Foreground Region

The Astrophysical Journal, 2023
We present analysis of [O i ] 63 μ m and CO J = 5 − 4 and 8 − 7 multiposition data in the W3A region and use it to develop a model for the extended low-density foreground gas that produces absorption features in the [O i ] and J = 5 − 4 CO lines.
Paul. F. Goldsmith, William D. Langer, Youngmin Seo, Jorge Pineda, Jürgen Stutzki, Christian Guevara, Rebeca Aladro, Matthias Justen   +7 more
doaj   +1 more source

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, Tan, Jonathan C, Tanaka, Kei E I   +2 more
openaire   +2 more sources

Irradiation Investigation: Exploring the Molecular Gas in NGC 7293

Galaxies, 2020
Background: Many planetary nebulae retain significant quantities of molecular gas and dust despite their signature hostile radiation environments and energetic shocks.
Jesse Bublitz, Joel Kastner, Pierre Hily-Blant, Thierry Forveille, Miguel Santander-García, Valentin Bujarrabal, Javier Alcolea, Rodolfo Montez   +7 more
doaj   +1 more source

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).
openaire   +2 more sources

Photodissociation of interstellar ArH+ [PDF]

, 2014
Aims. Following the recent detection of 36ArH+ in the Crab nebula spectrum, we have computed the photodissociation rate of ArH+ in order to constrain the physical processes at work in this environment. Methods.
Alekseyev, A. B., Bourlot, J. Le, Roueff, E.   +2 more
core   +3 more sources

Warm molecular hydrogen in the Spitzer SINGS galaxy sample [PDF]

, 2007
(simplified) Results on the properties of warm H2 in 57 normal galaxies are derived from H2 rotational transitions, obtained as part of SINGS. This study extends previous extragalactic surveys of H2, the most abundant constituent of the molecular ISM, to
Aalto S., B. T. Draine, Bajaja E., Braine J., Burton M. G., C. Bot, C. W. Engelbracht, Contini T., D. A. Dale, D. Calzetti, D. J. Hollenbach, Desert F. X., E. J. Murphy, E. Schinnerer, Elfhag T., F. Walter, G. Helou, Gatley I., Giard M., H. Roussel, Israel F. P., Israel F. P., J. D. Smith, Knapen J. H., Kohno K., Kohno K., L. Armus, Leon S., Lepp S., M. D. Thornley, Mauersberger R., Moorwood A. F., Moorwood A. F., Nakanishi H., Nishiyama K., Pagel B. E., Planesas P., Puxley P. J., R. C. Kennicutt, Sage L. J., Sage L. J., Shioya Y., Sofue Y., Strong A. W., Tacconi L. J., Valentijn E. A., Voit G. M., Wiklind T., Wilgenbus D.   +48 more
core   +4 more sources

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
openaire   +1 more source

CI Traces the Disk Atmosphere in the IM Lup Protoplanetary Disk

The Astrophysical Journal Letters, 2023
The central star and its energetic radiation fields play a vital role in setting the vertical and radial chemical structure of planet-forming disks.
Charles J. Law, Felipe Alarcón, L. Ilsedore Cleeves, Karin I. Öberg, Teresa Paneque-Carreño   +4 more
doaj   +1 more source

The Origin of Dust Polarization in the Orion Bar

The Astrophysical Journal, 2023
The linear polarization of thermal dust emission provides a powerful tool to probe interstellar and circumstellar magnetic fields, because aspherical grains tend to align themselves with magnetic field lines.
Valentin J. M. Le Gouellec, B-G Andersson, Archana Soam, Thiébaut Schirmer, Joseph M. Michail, Enrique Lopez-Rodriguez, Sophia Flores, David T. Chuss, John E. Vaillancourt, Thiem Hoang, Alex Lazarian   +10 more
doaj   +1 more source