Laboratoire d’Études du Rayonnement et de la Matière en Astrophysique et Atmosphères

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Bases de données

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Global Inundation Extent from Multi-Satellite
C’est un jeu de données unique qui fournit l’étendue et la dynamique des eaux de surface continentales, à l’échelle du globe, sur une longue période (1993-2008).

Stark-B : Base de données d’élargissement des raies isolées des atomes et
des ions dans l’approximation des impacts.

Il s’agit d’une base de données calculées de largeurs et déplacements de
raies isolées d’éléments neutres et ionisés dus à des collisions avec les
électrons et les ions dans un plasma.

BASECOL : Base de données collisionnelle ro-vibrationnelle
Cette base de données est consacrée aux Processus d’excitation ro-vibrationnelle de molecules par collision avec des atomes, ions, molecules ou electrons

MOLAT : Données Atomiques et Moléculaires
L’objectif de cette archive est de rendre accessibles des données atomiques et moléculaires originales, avant leur inclusion dans des bases plus complètes, ainsi que des compilations produites indépendamment par des membres de l’Observatoire ou au cours de leurs collaborations.

Séminaires à venir

Vendredi 21 septembre 2018, 14h00
Salle de l'atelier, Paris
Understanding the structure of molecular clouds: Multi-line wide-field imaging of Orion B
résumé :
The new generation of wide-bandwidth high-resolution receivers turns
almost any radio observation into a spectral survey. In the case of
wide-field imaging of the interstellar medium, such a wealth of data
provides new diagnostic tools, but also poses new challenges in terms of
data processing and analysis.

The ORION-B project aims at observing 5 square degrees of the Orion B
molecular cloud, or about half of the cloud's surface, over the entire
3mm band. The emission of tens of molecular tracers have been mapped,
including CO isotopologues, HCO+, CN, HNC, N2H+, methanol, SO, CN...
Machine learning techniques have been applied to these maps, in order to
segment the molecular cloud into typical regions based on their
molecular emission, and to idenfify the most meaningful correlations of
different molecular tracers with each other and with physical quantities
such as density or dust temperature.

The spatial coverage, together with the spatial and spectral resolution,
also allow to characterize statistically the kinematics and dynamics of
the gas. The amount of momentum in the compressive and solenoidal
(rotational) modes of turbulence are retrieved, showing that the cloud
is dominated by solenoidal motions, with the compressive modes being
concentrated in two star-forming regions - which is in line with the
overall very low star formation efficiency of the cloud, and highlights
the role of compressive forcing in the star formation process. The
filamentary network of the molecular cloud also proves to have
particluarly low densities, and is very stable against gravitational
collapse and fragmentation, which also points at a young evolutionary
stage of the filaments.
Vendredi 5 octobre 2018, 14h00
Salle de l'atelier, Paris
Astrochemistry in star forming regions : new modeling approaches
Emeric BRON
résumé :
Star-forming regions present rich infrared and millimeter spectra emitted by the gas exposed to the feedback of young stars. This emission is increasingly used to study the star formation cycle in other galaxies, but results from a complex interplay of physical and chemical processes : chemistry in the gas and on grain surfaces, (de)excitation processes of the atoms and molecules, heating and cooling balance,... Its understanding thus requires detailed astrochemical models that include the couplings between these processes. In this talk, I will present several examples where new modeling approaches of specific processes and their couplings proved crucial to solve persistent observational riddles : from the driving role of UV irradiation in the dynamics of photodissociation regions (PDR) to the efficient reformation of molecular hydrogen in these regions.
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