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

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Management team

by Murielle Chevrier - published on

- Director: Benoit SEMELIN
benoit.semelin @ obspm.fr

- Deputy Director: Martina WIEDNER
martina.wiedner @ obspm.fr

- Deputy Director: Ludovic PETITDEMANGE
ludovic.petitdemange @ obspm.fr

- Technical Director : Jean-Michel KRIEG
- jean-michel.krieg @ obspm.fr

- Administrator : Murielle CHEVRIER
murielle.chevrier @ obspm.fr

Séminaires à venir

Vendredi 12 juin 2020, 14h00
Observational and theoretical constraints on the formation and early evolution of the first dust grains in galaxies at 5 < z < 10
Laboratoire d'Astrophysique de Marseille
résumé :
The first generation of stars were born a few hundred million years after the big bang. These stars synthesized elements heavier than H and He, that are later expelled into the interstellar medium, initiating the rise of metals. Within this enriched medium, the first dust grains formed. This event is cosmological crucial for molecule formation as dust plays a major role by cooling low-metallicity star-forming clouds which can fragment to create lower mass stars. Collecting information on these first dust grains is difficult because of the negative alliance of large distances and low dust masses. We combine the observational information from galaxies at redshifts 5 < z < 10 to constrain their dust emission and theoretically understand the first evolutionary phases of the dust cycle. Spectral energy distributions (SEDs) are fitted with CIGALE and the physical parameters and their evolution are modelled. From this SED fitting, we build a dust emission template for this population of galaxies in the epoch of reionization. Our new models explain why some early galaxies are observed and others are not. We follow in time the formation of the first grains by supernovae later destroyed by other supernova blasts and expelled in the circumgalactic and intergalactic media.
Vendredi 3 juillet 2020, 14h00
Patricia TISSERA
Universidad Andres Bello, Santiago
résumé :
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