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

Home > Disclaimer



Observatoire de Paris LERMA - UMR8112
77 avenue Denfert Rochereau - 75014 Paris

5 place Jules Janssen - 92190 MEUDON

4 place Jussieu Tour 32-33 - 3eme ET - 75005 Paris

Université de Cergy-Pontoise

Privacy Policy

The only information that LERMA UMR8112 obtains about a site user is that supplied voluntarily by the user. This means that you can visit the LERMA UMR8112 website without giving your identity or revealing any information about yourself. Some of the LERMA UMR8112 programs or services may request specific user information, such as name and email address, and the user may decide whether to voluntarily supply that information. Pursuant to law n° 78-17 "Informatique et Libertés"/Computer science and privacy rights, you have the right to access, rectify and delete information about you on this website.

To exercise this right, please refer to webmaster.

Conditions of use

Exclusion of liability

The LERMA UMR8112 makes every effort to ensure, but does not guarantee, the accuracy of the information on its website. Hyperlinks to other websites imply neither responsibility for, nor approval of, the information contained in those other websites on the part of LERMA UMR8112.

Intellectual property

This LERMA UMR8112 website is the exclusive property of LERMA UMR8112 and is protected by French and international intellectual property law. No reproduction or representation of this website may be carried out in breach of the rights of LERMA UMR8112, as derived from the above-mentioned legislation.

Hypertext links

The introduction of hypertext links by third parties towards pages or documents published on the LERMA UMR8112 website is allowed, provided that such links do not breach the rights of LERMA UMR8112 and that the user is able to identify the origin and author of the document.


This website uses a graphic template that is designed and produced as part of the project for the harmonization of CNRS websites.

Project manager

Marco Cucchi (Pôle-web, DirCom, CNRS)

Web template development (Web team, Communications Department, CNRS)

  • Pascal Verrier: web development
  • Eric Furlan: web design and integration

Development of the plugin "Seminar"

Amaury Adon

Development of the initial versions of the template

Frank de Albuquerque - Jean-Baptiste Pressac (CNRS) - Valérie Pierre (CNRS) - Benoît Chassigneux - Julien Barnier (GRS) - Jean-Christophe Monferran (LAHIC) - Stéphane Pouyllau (CRHST)

CSS drop-down menu

Eric Meyer - http://more.ericmeyeroncss.com/projects/06/

Photo credits for the default banner

© CNRS Photothèque

Kit version


Logo SPIPKit made with SPIP (Internet publication system), free software published under GPL licence

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...