Results 1 to 10 of about 1,980 (156)

Photodissociation and X-Ray-Dominated Regions

Annual Review of Astronomy and Astrophysics, 2022
The radiation from stars and active galactic nuclei (AGNs) creates photodissociation regions (PDRs) and X-ray-dominated regions (XDRs), where the chemistry or heating is dominated by far-ultraviolet (FUV) radiation or X-ray radiation, respectively.
Mark Wolfire, Livia Vallini, Mélanie Chevance   +2 more
exaly   +3 more sources

The Resolved Structure of a Low-metallicity Photodissociation Region

The Astrophysical Journal
Photodissociation regions (PDRs) are key to understanding the feedback processes that shape interstellar matter in galaxies. One important type of PDR is the interface between H ii regions and molecular clouds, where far-ultraviolet radiation from ...
Ilyse Y. Clark, Karin Sandstrom, Mark Wolfire, Alberto D. Bolatto, Jérémy Chastenet, Daniel A. Dale, Brandt A. L. Gaches, Simon C. O. Glover, Javier R. Goicoechea, Karl D. Gordon, Brent Groves, Lindsey Hands, Ralf Klessen, Ilse De Looze, J. D. T. Smith, Dries Van De Putte, Stefanie K. Walch   +16 more
doaj   +5 more sources

Photoevaporation of Clumps in Photodissociation Regions [PDF]

Astrophysical Journal, 2002
To appear in the Astrophysical ...
Gorti, Uma, Hollenbach, David
exaly   +3 more sources

Wavelength-dependent photofragmentation of pyrazine [PDF]

Scientific Reports
Ultraviolet (UV) photon-induced dissociation of larger molecules is a rich source of smaller hydrocarbons and nitrogen-bearing molecules in the interstellar medium.
Siddhartha S. Payra, Pratikkumar Thakkar, Yash Lenka, G. Aravind   +3 more
doaj   +2 more sources

Photodissociation regions. I - Basic model. II - A model for the Orion photodissociation region

Astrophysical Journal, 1985
A theoretical parameter study of the temperature and chemical structure of dense photodissociation regions and their resultant spectrum is presented. Models are discussed which are relevant not only to the dust and gas between molecular clouds and H II regions, but also apply to any neutral cloud illuminated by intense FUV fluxes.
A. G. G. M. Tielens, D. Hollenbach
exaly   +2 more sources

Photodissociation regions in the interstellar medium of galaxies [PDF]

Reviews of Modern Physics, 1999
The interstellar medium of galaxies is the reservoir out of which stars are born and into which stars inject newly created elements as they age. The physical properties of the interstellar medium are governed in part by the radiation emitted by these stars.
Hollenbach, DJ, Tielens, A G G M
exaly   +4 more sources

Low-density photodissociation regions

Astrophysical Journal, 1991
A theoretical parameter study of the temperature and chemical structure of photodissociation regions (PDRs) and their resultant spectrum is presented. The models, which solve for the chemical and thermal steady state of a one-dimensional slab exposed to an incident FUV flux, relate the observed line and continuum emission from these regions to physical
David J. Hollenbach, Takamasa Takahashi, A. G. G. M. Tielens   +2 more
exaly   +2 more sources

High-resolution Observations of H i in the IC 63 Reflection Nebula

The Astronomical Journal, 2023
Photodissociation regions (PDRs), where the (far-)ultraviolet light from hot young stars interact with the gas in surrounding molecular clouds, provide laboratories for understanding the nature and role of feedback by star formation on the interstellar ...
Lars Bonne, B-G Andersson, Robert Minchin, Archana Soam, Joshua Yaldaei, Kristin Kulas, Janik Karoly, Lewis B. G. Knee, Siddharth Kumar, Nirupam Roy   +9 more
doaj   +1 more source

C₆₀IN PHOTODISSOCIATION REGIONS [PDF]

The Astrophysical Journal, 2014
Recent studies have confirmed the presence of buckminsterfullerene (C$_{60}$) in different interstellar and circumstellar environments. However, several aspects regarding C$_{60}$ in space are not well understood yet, such as the formation and excitation processes, and the connection between C$_{60}$ and other carbonaceous compounds in the interstellar
Castellanos, Pablo; Berné, Olivier; Sheffer, Yaron; Wolfire, Mark G.; Tielens, Alexander G. G. M.   +5 more
openaire   +2 more sources

SOFIA FEEDBACK Survey: The Pillars of Creation in [C ii] and Molecular Lines

The Astronomical Journal, 2023
We investigate the physical structure and conditions of photodissociation regions (PDRs) and molecular gas within the Pillars of Creation in the Eagle Nebula using SOFIA FEEDBACK observations of the [C ii ] 158 μ m line.
Ramsey L. Karim, Marc W. Pound, Alexander G. G. M. Tielens, Maitraiyee Tiwari, Lars Bonne, Mark G. Wolfire, Nicola Schneider, Ümit Kavak, Lee G. Mundy, Robert Simon, Rolf Güsten, Jürgen Stutzki, Friedrich Wyrowski, Netty Honingh   +13 more
doaj   +1 more source