THE CO-TO-H2 CONVERSION FACTOR FROM INFRARED DUST EMISSION ACROSS THE LOCAL GROUP
- A. Leroy, A. Bolatto, A. Kawamura
- Physics
- 22 February 2011
We estimate the conversion factor relating CO emission to H2 mass, αCO, in five Local Group galaxies that span approximately an order of magnitude in metallicity—M 31, M 33, the Large Magellanic…
Giant molecular clouds in the Local Group galaxy M 33
- P. Gratier, J. Braine, M. Rollig
- Physics
- 18 November 2011
We present an analysis of the systematic CO(2-1) survey at 12" resolution covering most of the local group spiral M 33 which, at a distance of 840 kpc, is close enough that individual giant molecular…
Molecular and atomic gas in the Local Group galaxy M 33
- P. Gratier, J. Braine, B. Mookerjea
- Physics
- 16 March 2010
We present high-resolution large-scale observations of the molecular and atomic gas in the Local Group galaxy M 33. The observations were carried out using the HEterodyne Receiver Array (HERA) at the…
The IRAM M 33 CO(2–1) survey - A complete census of molecular gas out to 7 kpc
To study the interstellar medium and the interplay between the atomic and molecular components in a low-metallicity environment, we present a complete high angular and spectral resolution map and…
The anatomy of the Orion B Giant Molecular Cloud: A local template for studies of nearby galaxies
- J. Pety, V. Guzm'an, A. Sievers
- Physics
- 12 November 2016
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-30m to spatially…
Modelling complex organic molecules in dense regions: Eley–Rideal and complex induced reaction
- M. Ruaud, J. Loison, K. Hickson, P. Gratier, F. Hersant, V. Wakelam
- Physics
- 19 December 2014
Recent observations have revealed the existence of Complex Organic Molecules (COMs) in cold dense cores and prestellar cores. The presence of these molecules in such cold conditions is not well…
THE 2014 KIDA NETWORK FOR INTERSTELLAR CHEMISTRY
- V. Wakelam, J. Loison, R. Wester
- Physics
- 5 March 2015
Chemical models used to study the chemical composition of the gas and the ices in the interstellar medium are based on a network of chemical reactions and associated rate coefficients. These…
The IRAM-30 m line survey of the Horsehead PDR - II. First detection of the l-C3H+ hydrocarbon cation
- J. Pety, P. Gratier, D. Talbi
- Physics
- 30 October 2012
Context. Pure gas-phase chemistry models do not succeed in reproducing the measured abundances of small hydrocarbons in the interstellar medium. Information on key gas-phase progenitors of these…
The IRAM-30 m line survey of the Horsehead PDR - IV. Comparative chemistry of H2CO and CH3OH
- V. Guzmán, J. Goicoechea, A. Faure
- Physics
- 1 December 2012
Context. Theoretical models and laboratory experiments show that CH3OH is efficiently formed on cold grain surfaces through the successive hydrogenation of CO, forming HCO and H2CO as intermediate…
On the reservoir of sulphur in dark clouds : chemistry and elemental abundance reconciled
- T. Vidal, J. Loison, A. Jaziri, M. Ruaud, P. Gratier, V. Wakelam
- Geology
- 5 April 2017
Sulphur-bearing species are often used to probe the physical structure of star forming regions of the interstellar medium, but the chemistry of sulphur in these regions is still poorly understood. In…
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