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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…
Effect of feedback of massive stars in the fragmentation, distribution, and kinematics of the gas in two star forming regions in the Carina Nebula
David Rebolledo, Andrés E. Guzmán, Yanett Contreras +7
We present ALMA high spatial resolution observations towards two star forming regions located in one of the most extreme zones of star formation in the Galaxy, the Carina Nebula. O…
A dynamically young, gravitationally stable network of filaments in Orion B
Jan H. Orkisz, Nicolas Peretto, Jérôme Pety +15
Filaments are a key step on the path that leads from molecular clouds to star formation. However, their characteristics are heavily debated, and the exact processes that lead to th…
Chemistry of the High-Mass Protostellar Molecular Clump IRAS 16562-3959
Andrés E. Guzmán, Viviana V. Guzmán, Guido Garay +2
We present molecular line observations of the high-mass molecular clump IRAS 165623959 taken at 3 mm using the Atacama Large Millimeter/submillimeter Array (ALMA) at 1.$\!\!^{\p…
Pillars of creation amongst destruction: Star formation in molecular clouds near R136 in 30 Doradus
Venu M. Kalari, Monica Rubio, Bruce G. Elmegreen +3
New sensitive CO(2-1) observations of the 30 Doradus region in the Large Magellanic Cloud are presented. We identify a chain of three newly discovered molecular clouds we name KN1,…
Turbulence and star formation efficiency in molecular clouds: solenoidal versus compressive motions in Orion B
Jan H. Orkisz, Jérôme Pety, Maryvonne Gerin +13
The nature of turbulence in molecular clouds is one of the key parameters that control star formation efficiency: compressive motions, as opposed to solenoidal motions, can trigger…
The anatomy of the Orion B Giant Molecular Cloud: A local template for studies of nearby galaxies
Jérôme Pety, Viviana V. Guzmán, Jan H. Orkisz +11
We aim to develop the Orion B Giant Molecular Cloud (GMC) as a local template for interpreting extra-galactic molecular line observations. We use the wide-band receiver at the IRAM…
An observational investigation of the identity of B11244 (-CH/CH)
Brett A. McGuire, P. Brandon Carroll, Pierre Gratier +6
Pety et al. (2012) have reported the detection of eight transitions of a closed-shell, linear molecule (B11244) in observations toward the Horsehead PDR, which they attribute to th…
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…
The IRAM-30m line survey of the Horsehead PDR: I. CF+ as a tracer of C+ and a measure of the Fluorine abundance
V. Guzmán, J. Pety, P. Gratier +4
C+ is a key species in the interstellar medium but its 158 μm fine structure line cannot be observed from ground-based telescopes. Current models of fluorine chemistry predict that…
H2CO in the Horsehead PDR: Photo-desorption of dust grain ice mantles
V. Guzmán, J. Pety, J. R. Goicoechea +2
Aims: For the first time we investigate the role of the grain surface chemistry in the Horsehead Photo-dissociation region (PDR). Methods: We performed deep observations of several…