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

Accueil > en > Research > Databases


publié le , mis à jour le

Global Inundation Extent from Multi-Satellite
This is a unique dataset that provides the surface water extent and dynamics over the globe and over a long time record (1993-2008).

Stark-B : Database for "Stark" broadening of isolated lines of atoms and ions in the impact approximation
This is a database of calculated widths and shifts of isolated lines of atoms and ions due to electron and ion collisions.

BASECOL : Ro-Vivrational Collisional Database
This database is devoted to collisional ro-vibrational excitation of molecules by colliders such as atom, ion, molecule or electron

MOLAT : Atomic and Molecular Data
The purpose of this online archive is to make available, before their inclusion into more comprehensive databases, original atomic and molecular data or compilations produced independently or in the course of collaborations by members of the Paris Observatory.

Séminaires à venir

Vendredi 28 septembre 2018, 14h00
Salle de l'atelier, Paris
The [CII] emission line as a molecular gas mass tracer in galaxies at low and high redshift
résumé :
So far the gas conditions in main-sequence galaxies at the peak of the cosmic star formation history have been mainly investigated through the CO emission lines. However, observing the CO transitions at higher redshift becomes challenging, since the lines luminosity weakens as metallicity decreases. A powerful alternative could be the [CII] emission at 158um instead: it is one of the brightest lines in the far IR regime observed in star-forming galaxies and it is the main coolant of the interstellar medium. Local studies show that the [CII] luminosity correlates with the galaxy star formation rate (SFR), although main-sequence sources and starbursts seem to have different behaviours. At higher redshift the picture is even less clear and only samples of starbursts have been analyzed so far. To remedy this situation we have observed with ALMA a sample of 10 main-sequence sources at z ~ 2 and we complemented our sample with literature data at lower and higher redshift. We found that the [CII] luminosity correlates with galaxies' molecular gas mass, independently of their depletion time, metallicity, and redshift. This lays foundations for future explorations of the interstellar medium of starbursts and galaxies at much higher redshift (z > 4).

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.
Tous les séminaires...