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The Horsehead mane: Towards an observational benchmark for chemical models
Jérôme Pety, Javier R. Goicoechea, Maryvonne Gerin +5
After a discussion about the need for observational benchmark for chemical models, we explain 1) why the Horsehead western edge is well suited to serve as reference for models and…
Physical Characteristics of a Dark Cloud in an Early Stage of Star Formation toward NGC 7538: an Outer Galaxy Infrared Dark Cloud?
Wilfred W. F. Frieswijk, Marco Spaans, Russell F. Shipman +2
In the inner parts of the Galaxy the Infrared Dark Clouds (IRDCs) are presently believed to be the progenitors of massive stars and star clusters. Many of them are predominantly de…
Deuterium fractionation in the Horsehead edge
Jérôme Pety, Javier R. Goicoechea, Pierre Hily-Blant +2
Deuterium fractionation is known to enhance the [DCO+]/[HCO+] abundance ratio over the D/H elemental ratio of about 1e-5 in the cold and dense gas typically found in pre-stellar co…
The depletion of NO in pre-protostellar cores
Meltem Akyilmaz, David Flower, Pierre Hily-Blant +2
Understanding the depletion of heavy elements is a fundamental step towards determining the structure of pre-protostellar cores just prior to collapse. We study the dependence of t…
Small-scale dissipative structures of diffuse ISM turbulence: I- CO diagnostics
Pierre Hily-Blant, Jerome Pety, Edith Falgarone
Observations of translucent molecular gas in CO and CO emission lines, at high spectral and spatial resolutions, evidence different kinds of structures at small scale…