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Physical conditions in PDRs revealed by IGRINS ro-vibrational H2 observations
Aurélien Piluso, Vincent Maillard, Raphael Meshaka +10
We compare H2 high ro-vibrational observations of 5 PDRs (S140, IC63, Horsehead Nebula, NGC 2023 and Orion Bar) obtained with the IGRINS spectrograph to PDR models produced with th…
PDRs4All XVII: Formation and excitation of HD in photodissociation regions. Application to the Orion Bar
Marion Zannese, Jacques Le Bourlot, Evelyne Roueff +12
The James Webb Space Telescope enabled the first detection of several rovibrational emission lines of HD in the Orion Bar, a prototypical photodissociation region. This provides an…
JWST observations of photodissociation regions: II. Warm molecular Hydrogen spectroscopy in the Horsehead nebula
M. Zannese, P. Guillard, A. Abergel +16
H2 is the most abundant molecule in the interstellar medium and is a useful tool to study photodissociation regions, where radiative feedback from massive stars on molecular clouds…
A Tentative Detection of Molecular Hydrogen (H) Emission Lines at Cosmic Dawn
Madisen Johnson, Blakesley Burkhart, Francesco D'Eugenio +11
We present a theoretical framework for interpreting far-ultraviolet (FUV) fluorescent emission from molecular hydrogen (H) in high-redshift galaxies, motivated by the unique ca…
PDRs4All. X. ALMA and JWST detection of neutral carbon in the externally irradiated disk d203-506: Undepleted gas-phase carbon
Javier R. Goicoechea, J. Le Bourlot, J. H. Black +26
The gas-phase abundance of carbon, x_C = C/H, and its depletion factors are essential parameters for understanding the gas and solid compositions that are ultimately incorporated i…
PDRs4All IX. Sulfur elemental abundance in the Orion Bar
Asunción Fuente, Evelyne Roueff, Franck Le Petit +31
One of the main problems in astrochemistry is determining the amount of sulfur in volatiles and refractories in the interstellar medium. The detection of the main sulfur reservoirs…
HCN emission from translucent gas and UV-illuminated cloud edges revealed by wide-field IRAM 30m maps of Orion B GMC: Revisiting its role as tracer of the dense gas reservoir for star formation
M. G. Santa-Maria, J. R. Goicoechea, J. Pety +28
We present 5 deg^2 (~250 pc^2) HCN, HNC, HCO+, and CO J=1-0 maps of the Orion B GMC, complemented with existing wide-field [CI] 492 GHz maps, as well as new pointed observations of…
Understanding the temperatures of H3+ and H2 in diffuse interstellar sightlines
Jacques Le Bourlot, Evelyne Roueff, Franck Le Petit +3
The triatomic hydrogen ion H3+ is one of the most important species for the gas phase chemistry of the interstellar medium. Observations of H3+ are used to constrain important phys…
Quantitative inference of the column densities from 3 mm molecular emission: A case study towards Orion B
Pierre Gratier, Jérôme Pety, Emeric Bron +21
Molecular hydrogen being unobservable in cold molecular clouds, the column density measurements of molecular gas currently rely either on dust emission observation in the far-IR or…
Tracers of the ionization fraction in dense and translucent gas: I. Automated exploitation of massive astrochemical model grids
Emeric Bron, Evelyne Roueff, Maryvonne Gerin +21
The ionization fraction plays a key role in the physics and chemistry of the neutral interstellar medium, from controlling the coupling of the gas to the magnetic field to allowing…
The chemistry of disks around T Tauri and Herbig Ae/Be stars
Marcelino Agundez, Evelyne Roueff, Franck Le Petit +1
Infrared and (sub-)mm observations of disks around T Tauri and Herbig Ae/Be stars point to a chemical differentiation between both types of disks, with a lower detection rate of mo…
Structure of photodissociation fronts in star-forming regions revealed by observations of high-J CO emission lines with Herschel
C. Joblin, E. Bron, C. Pinto +17
In bright photodissociation regions (PDRs) associated to massive star formation, the presence of dense "clumps" that are immersed in a less dense interclump medium is often propose…
Chemical Evolution of Turbulent Multiphase Molecular Clouds
Valeska Valdivia, Patrick Hennebelle, Benjamin Godard +3
Molecular clouds are essentially made up of atomic and molecular hydrogen, which in spite of being the simplest molecule in the ISM plays a key role in the chemical evolution of mo…
Origin of CH+ in diffuse molecular clouds warm H2 and ion-neutral drift
Valeska Valdivia, Benjamin Godard, Patrick Hennebelle +3
This paper assesses the roles of the presence of warm H2, and the increased formation rate due to the ion-neutral drift. We performed ideal MHD simulations that include the heating…
Radiative and mechanical feedback into the molecular gas in the Large Magellanic Cloud. I. N159W
Min-Young Lee, Suzanne Madden, Vianney Lebouteiller +25
We present Herschel SPIRE Fourier Transform Spectrometer (FTS) observations of N159W, an active star-forming region in the Large Magellanic Cloud (LMC). In our observations, a numb…
Efficient ortho-para conversion of H2 on interstellar grain surfaces
Emeric Bron, Franck Le Petit, Jacques Le Bourlot
Context: Fast surface conversion between ortho- and para-H2 has been observed in laboratory studies, and this mechanism has been proposed to play a role in the control of the ortho…
Physical conditions in the central molecular zone inferred by H3+
Franck Le Petit, Maxime Ruaud, Emeric Bron +4
The H3+ molecule has been detected in many lines of sight within the central molecular zone (CMZ) with exceptionally large column densities and unusual excitation properties compar…
Surface chemistry in the Interstellar Medium II. formation on dust with random temperature fluctuations
Emeric Bron, Jacques Le Bourlot, Franck Le Petit
The formation on grains is known to be sensitive to dust temperature, which is also known to fluctuate for small grain sizes due to photon absorption. We aim at expl…
Chemical complexity in the Horsehead photodissociation region
Viviana V. Guzmán, Jérôme Pety, Pierre Gratier +5
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…
Photodissociation of interstellar ArH+
E. Roueff, A. B. Alekseyev, J. Le Bourlot
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…
HI-to-H2 Transitions and H I Column Densities in Galaxy Star-Forming Regions
Amiel Sternberg, Franck Le Petit, Evelyne Roueff +1
We present new analytic theory and radiative transfer computations for the atomic to molecular (HI-to-H2) transitions, and the build-up of atomic-hydrogen (HI) gas columns, in opti…
The IRAM-30m line survey of the Horsehead PDR: IV. Comparative chemistry of H2CO and CH3OH
V. V. Guzman, J. R. Goicoechea, J. Pety +6
Aims. We investigate the dominant formation mechanism of H2CO and CH3OH in the Horsehead PDR and its associated dense core. Methods. We performed deep integrations of several H2CO…
Spatial distribution of small hydrocarbons in the neighborhood of the Ultra Compact HII region Monoceros R2
P. Pilleri, S. Treviño-Morales, A. Fuente +14
We study the chemistry of small hydrocarbons in the photon-dominated regions (PDRs) associated with the ultra-compact HII region Mon R2. Our goal is to determine the variations of…
The IRAM-30m line survey of the Horsehead PDR: II. First detection of the l-C3H+ hydrocarbon cation
Jérôme Pety, P. Gratier, V. Guzmán +9
We present the first detection of the l-C3H+ hydrocarbon in the interstellar medium. The Horsehead WHISPER project, a millimeter unbiased line survey at two positions, namely the p…