STAGE What is the role of the cosmic web in shaping galaxy star formation histories?

Date de mise à jour de l’offre

CNRS - Institut d'Astrophysique de Paris :

Unité Mixte de Recherche CNRS / Sorbonne Université

Description de la mission

Although we now understand the broad lines of galaxy formation, pinpointing the physical origins of the dramatic changes within individual galaxies throughout cosmic time has proved extremely challenging. What shapes the diversity of galaxy formation histories? In particular the net impact of the cosmic web environment on galaxy growth and quenching is widely debated. On the one hand, filamentary cold gas, accreted from the cosmic web environment is indeed expected to play a prominent role in galaxy mass assembly, especially at high redshift. On the other hand, precisely characterising the environment of galaxies from an observational dataset is very challenging, because it requires extremely good photometric redshifts on large volumes.
Exquisite multi-wavelength data are currently being taken on the 2x10 square degree of the primary Euclid Deep fields, as part of the cosmic dawn survey. Thanks to their depth and accuracy, these data represent the only survey, currently or in planning, which offers the possibility to carry-out a statistically robust study of the cosmic web environment of a complete mass-limited sample of galaxies up to redshift 2. It is very timely now to prepare the scientific exploitation of this unique dataset.
To do so, the student will rely on simulated photometric catalogues produced from the Horizon-AGN simulation (Dubois+14, Laigle et al. 2019), designed to mimic the redshift accuracy that we will obtain on the Euclid deep fields. Based on this simulation, the student will calibrate the method for extracting cosmic filaments (extending the work done in Laigle et al. 2018), especially at z>1, which is still an unexplored redshift range for this kind of study. He will then apply his/her method to the COSMOS2020 dataset, already available, for which the accuracy is similar to the one that we will get on the Euclid deep field. If time allows, he/she will start investigating if and how galaxy star-formation histories correlate with their position in cosmic filaments/nodes/voids, especially at z>1. Depending on the performance of the student, this work can lead to a publication.
The project will be carried out at the Institut d’Astrophysique de paris under the direction of Clotilde Laigle and H.J.McCracken

Profil recherché

Simulations numériques

Niveau de qualification requis

Bac + 4/5 et +
  • Employeur
    CNRS - Institut d'Astrophysique de Paris
  • Secteur d’activité de la structure
    Enseignement - Formation - Recherche
  • Effectif de la structure
    De 51 à 250 salariés
  • Site internet de la structure
  • Type de stage ou contrat
    Stage pour lycéens et étudiants en formation initiale
  • Date prévisionnelle de démarrage
  • Durée du stage ou contrat
    Plus de 2 mois et jusqu'à 4 mois
  • Le stage est-il rémunéré ?
  • Niveau de qualification requis

    Bac + 4/5 et +
  • Lieu du stage
    CNRS - IAP
    98 bis Boulevard Arago 75014
  • Accès et transports
    RER, métro Denfert-Rochereau