214 citations · 1k across the 19 of their papers we have counts for
13 papers · 1 filter
Chemical segregation in the young protostars Barnard 1b-N and S: evidence of pseudo-disk rotation in Barnard 1b-S
Asunción Fuente, Maryvonne Gerin, Jerome Pety +7
The extremely young Class 0 object B1b-S and the first hydrostatic core (FSHC) candidate, B1b-N, provide a unique opportunity to study the chemical changes produced in the elusive…
Detection of CH+, SH+, and their 13C- and 34S- isotopologues toward PKS1830-211
S. Muller, H. S. P. M"uller, J. H. Black +13
The z=0.89 molecular absorber toward PKS1830-211 provides us with the opportunity to probe the chemical and physical properties of the interstellar medium in the disk of a galaxy a…
ALMA hints at the existence of an unseen reservoir of diffuse molecular gas in the Galactic bulge
M. Gerin, H. Liszt
Aims. We aim to understand the unexpected presence of mm-wave molecular absorption at -200 \kms \kms\ in a direction that is well away from regions of the Galact…
Ionization fraction and the enhanced sulfur chemistry in Barnard 1
A. Fuente, J. Cernicharo, E. Roueff +7
Barnard B1b has revealed as one of the most interesting globules from the chemical and dynamical point of view. It presents a rich molecular chemistry characterized by large abunda…
NH and NNH towards the prestellar core 16293E in L1689N
F. Daniel, A. Faure, L. Pagani +6
Understanding the processes that could lead to enrichment of molecules in N atoms is of particular interest in order to shed light on the relatively large variations observe…
Collisional excitation of doubly and triply deuterated ammonia NDH and ND by H
F. Daniel, C. Rist, A. Faure +6
The availability of collisional rate coefficients is a prerequisite for an accurate interpretation of astrophysical observations, since the observed media often harbour densities w…
H2 distribution during formation of multiphase molecular clouds
Valeska Valdivia, Patrick Hennebelle, Maryvonne Gérin +1
H2 is the simplest and the most abundant molecule in the ISM, and its formation precedes the formation of other molecules. Understanding the dynamical influence of the environment…
Probing non polar interstellar molecules through their protonated form: Detection of protonated cyanogen (NCCNH+)
M. Agundez, J. Cernicharo, P. de Vicente +19
Cyanogen (NCCN) is the simplest member of the series of dicyanopolyynes. It has been hypothesized that this family of molecules can be important constituents of interstellar and ci…
Upper limits to interstellar NH+ and para-NH2- abundances. Herschel-HIFI observations towards Sgr B2 (M) and G10.6-0.4 (W31C)
C. M. Persson, M. Hajigholi, G. E. Hassel +12
The understanding of interstellar nitrogen chemistry has improved significantly with recent results from the Herschel Space Observatory. To set even better constraints, we report h…
Water absorption in Galactic translucent clouds: conditions and history of the gas derived from Herschel/HIFI PRISMAS observations
N. Flagey, P. F. Goldsmith, D. C. Lis +8
We present Herschel/HIFI observations of nine transitions of \hho and \hheo towards six high-mass star-forming regions, obtained as part of the PRISMAS Key Program. Water vapor in…
Nitrogen hydrides in the cold envelope of IRAS16293-2422
Pierre Hily-Blant, Sébastien Maret, Aurore Bacmann +4
Nitrogen is the fifth most abundant element in the Universe, yet the gas-phase chemistry of N-bearing species remains poorly understood. Nitrogen hydrides are key molecules of nitr…
Nitrogen Isotopic Fractionation in Interstellar Ammonia
D. C. Lis, A. Wootten, M. Gerin +1
Using the Green Bank Telescope (GBT), we have obtained accurate measurements of the N/N isotopic ratio in ammonia in two nearby cold, dense molecular clouds, Barnard~…
The ionization fraction gradient across the Horsehead edge: An archetype for molecular clouds
J. R. Goicoechea, J. Pety, M. Gerin +2
The ionization fraction plays a key role in the chemistry and dynamics of molecular clouds. We study the H13CO+, DCO+ and HOC+ line emission towards the Horsehead, from the shielde…