A Model for Atomic and Molecular Interstellar Gas: The Meudon PDR Code

By Franck Le Petit, C. Nehm'e, J. Le Bourlot, È. Roueff. 2006

374 citations recorded by the source corpus.

We present the revised "Meudon" model of photon-dominated region (PDR) code, available on the Web under the GNU Public License. General organization of the code is described down to a level that should allow most observers to use it as an interpretation tool with minimal help from our part. Two grids of models, one for low-excitation diffuse clouds and one for dense highly illuminated clouds, are discussed, and some new results on PDR modelization highlighted.

Subfields: Astronomy and Astrophysics

View Paper: https://www.semanticscholar.org/paper/b684ef7c802fc8c49d5f92a90194dc2fb98ef6aa

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In Astronomy and Astrophysics

Citations in the corpus

Turbulent molecular clouds (2012, background): “State-of-the-art models of photo-dominated regions (PDR) (Le Petit et al. 2006) have met with success even with uniform density distributions.”
Molecular Clouds in the Milky Way (2015, background): “…and low to moderate radiation fields, the gas is expected to be almost fully molecular at column densities greater than 1–2 × 1020 cm−2 (Hollenbach et al. 1971, Federman et al. 1979, Sternberg & Dalgarno 1995, Le Petit et al. 2006, Röllig et al. 2006, McKee & Krumholz 2010, Sternberg et al. 2014).”
A KINETIC DATABASE FOR ASTROCHEMISTRY (KIDA) (2012, background): “Other accessible databases exist for particular cases such as Srates2 for sulfur chemistry (Wakelam et al. 2004, 2011), a database for shock models (Pineau des Forets et al. 1993) and one for photon-dominated regions3 (Le Petit et al. 2006).”
A NEW NETWORK FOR HIGHER-TEMPERATURE GAS-PHASE CHEMISTRY. I. A PRELIMINARY STUDY OF ACCRETION DISKS IN ACTIVE GALACTIC NUCLEI (2010, methodology): “We modified the model in order to include a variable radiation field, and, for χ greater than 1000, we utilize the Meudon PDR code (Le Petit et al. 2006) to obtain more accurate photodissociation rates for CO and H2.”
THE DARK MOLECULAR GAS (2010, methodology): “The second part is based on the Le Petit et al. (2006) Meudon PDR code and is used for all of the molecular hydrogen processes.”
The photodissociation and chemistry of CO isotopologues: applications to interstellar clouds and circumstellar disks (2009, methodology): “Following vDB88, Le Bourlot et al. (1993), Lee et al. (1996) and Le Petit et al. (2006), we treat the line and continuum attenuation separately.”
Analysis of the emission of very small dust particles from Spitzer spectro-imagery data using blind signal separation methods (2007, methodology): “The radiation field was calculated using the Meudon PDR code (Le Bourlot et al. 1993; Le Petit et al. 2006).”
CO Isotopologues in the Perseus Molecular Cloud Complex: the X-factor and Regional Variations (2008, methodology): “To relate the observed variations in the 12CO and 13CO lines with changes in the physical properties of the regions, we use the Meudon PDR code (Le Petit et al. 2006).3 This code includes most physical effects by explicit calculation; in particular it calculates the 12CO shielding, unlike the…”
A Compendium of Far-Infrared Line and Continuum Emission for 227 Galaxies Observed by the Infrared Space Observatory (2008, background): “…& Hollenbach 1990; Hollenbach, Takahashi, & Tielens 1991; Spinoglio & Malkan 1992; Rubin et al. 1994; Kaufman et al. 1999; Abel et al. 2005; Le Petit et al. 2006; Meijerink, Spaans, Israel 2007; Groves et al. 2008), these fine structure transitions can be used to derive gas temperatures,…”
Photodissociation and photoionisation of atoms and molecules of astrophysical interest (2017, background): “This is shown to significantly modify the UV spectrum in embedded regions (Le Petit et al. 2006), as well as for Lyman-α photons scattered by atomicH (Neufeld 1991; Bethell & Bergin 2011).”
Ultraviolet Survey of CO and H2 in Diffuse Molecular Clouds: The Reflection of Two Photochemistry Regimes in Abundance Relationships (2008, methodology): “15 of Le Petit et al. 2006), while an increased H2 abundance increases the destruction rate of CH+ through the formation of CH+2 and, eventually, CH (§ 6.3).”
Interstellar OH+, H2O+ and H3O+ along the sight-line to G10.6–0.4 (2010, methodology): “In order to model the OH+ and H2O+ chemistry in diffuse clouds, we used the Meudon PDR code1, a photochemical model of a plane parallel and stationary PDR (Le Petit et al. 2006, Goicoechea & Le Bourlot 2007).”
Chemistry in Disks. IV. Benchmarking gas-grain chemical models with surface reactions (2010, methodology): “…ratefiles: the UDFA (Umist Database For Astrochemistry1) (Millar et al., 1997; Le Teuff et al., 2000; Woodall et al., 2007), the OSU database (Ohio State University2) (Smith et al., 2004), and a network incorporated in the “Photo-Dissociation Region” code from Meudon3 (Le Petit et al., 2006).”
On the relationship between molecular hydrogen and carbon monoxide abundances in molecular clouds (2010, background): “…but the very complexity of these models limits their applicability to highly simplified geometries: typically the adopted cloud models are one-dimensional, assuming either spherical symmetry (e.g. Stoerzer, Stutzki & Sternberg 1996) or a semi-infinite, uniform slab (e.g. Le Petit et al. 2006).”
ROTATIONAL QUENCHING OF CO DUE TO H2 COLLISIONS (2010, background): “In recent years, various codes that model the physics and chemistry of PDRs have been developed with an emphasis on the excitation mechanisms of both H2 and CO (van Dishoeck & Black 1988; Warin et al. 1996; Le Petit et al. 2006; Shaw et al. 2005; Röllig et al. 2007).”