Results 81 to 90 of about 16,662 (218)
NeuralPDR: neural differential equations as surrogate models for photodissociation regions
Machine Learning: Science and TechnologyComputational astrochemical models are essential for helping us interpret and understand the observations of different astrophysical environments. In the age of high-resolution telescopes such as JWST and ALMA, the substructure of many objects can be ...
Gijs Vermariën +5 more
doaj +1 more source
Grain Dynamics in Photodissociation Regions
, 1998 We discuss the forces on grains exposed to anisotropic radiation fields, including the usual ``radiation pressure'' force and also recoil forces due to photoemitted electrons, photodesorbed hydrogen atoms, and hydrogen molecules which form on the grain surface.
Weingartner, Joseph C., Draine, Bruce T.
openaire +2 more sources
Models of clumpy photodissociation regions
The Astrophysical Journal, 1993 FIR fine structure line and submillimeter line emissions important in the cooling of photodissociation regions (PDRs) as they would arise in clumpy regions are investigated with a simple two-component model for clumpy PDRs consisting of high-density clumps embedded in a lower density interclump medium.
M. Meixner, A. G. G. M. Tielens
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Quantum State‐Resolved Photodissociation Dynamics Study of Transition‐Metal Carbonyl and Nitrosyl
The Chemical Record, EarlyView.State‐resolved scattering measurements provide experimental visualization of nuclear motions in reacting molecules. Carbonyls and nitrosyls are typical ligands in most of the transition‐metal complexes, which undergo dissociation upon visible and ultraviolet photoexcitation.
Keigo Nagamori +2 more
wiley +1 more source
Far Infrared and Submillimeter Emission from Galactic and Extragalactic Photo-Dissociation Regions [PDF]
, 1999 Photodissociation Region (PDR) models are computed over a wide range of physical conditions, from those appropriate to giant molecular clouds illuminated by the interstellar radiation field to the conditions experienced by circumstellar disks very close ...
Abgrall H. +16 more
core +2 more sources
The Astrophysical JournalWe investigate the emergence phase of young star clusters in the nearby spiral galaxy NGC 628. We use JWST NIRCam and MIRI observations to create spatially resolved maps of the Pa α 1.87 μ m and Br α 4.05 μ m hydrogen recombination lines, as well as 3.3 ...
Alex Pedrini +23 more
doaj +1 more source
Implementation of Chemistry in the Athena++ Code
The Astrophysical Journal Supplement Series, 2023 Chemistry plays a key role in many aspects of astrophysical fluids. Atoms and molecules are agents for heating and cooling, determine the ionization fraction, serve as observational tracers, and build the molecular foundation of life.
Munan Gong +8 more
doaj +1 more source
Spectroscopic analysis of bacterial photoreactivation
Photochemistry and Photobiology, Volume 101, Issue 2, Page 494-504, March/April 2025.This study investigates the effectiveness of fluorescence and Raman spectroscopy in detecting bacterial photoreactivation. Fluorescence spectroscopy shows limitations, because the intense fluorescence of tryptophan and tyrosine masks fluorescence emitted by thymine molecules.
Keyvan Khosh Abady +4 more
wiley +1 more source
The opaque nascent starburst in NGC 1377: Spitzer SINGS observations [PDF]
, 2006 We analyze extensive data on NGC 1377 from the Spitzer Infrared Nearby Galaxies Survey (SINGS). Within the category of nascent starbursts that we previously selected as having infrared-to-radio continuum ratios in large excess of the average and ...
Armus, L. +18 more
core +3 more sources
TIRAMISU: Non-LTE Radiative Transfer for Molecules in Exoplanet Atmospheres
The Astrophysical JournalThe TIRAMISU code, a new program for computing on-the-fly non-LTE molecular spectra and opacities for solving self-consistent radiative transfer problems in exoplanet atmospheres, is presented.
Charles A. Bowesman +3 more
doaj +1 more source