Résumé / Abstract Journal-club_Univers

Séminaire Univers /
Seminar Universe

« Probing the azimuthal environment of galaxies around clusters. From cluster core to cosmic filaments »

Céline Gouin
Inst. Astroph. Spatiale (IAS), Univ. Paris-Sud XI (Orsay, France)

Galaxy clusters are connected at their peripheries to the large scale structures by cosmic filaments that funnel accreting material. These filamentary structures are studied to investigate both environment-driven galaxy evolution and structure formation and evolution.
In this presentation, I probe in a statistical manner the azimuthal distribution of galaxies around clusters by performing harmonic decompositions in large photometric galaxy catalogues around 6400 SDSS clusters (0.1< z <0.3).
In the inner cluster regions, the galaxy distribution traces an ellipsoidal shape, which is more pronounced for rich clusters. In the clusters' outskirts, filamentary patterns are detected in harmonic space: massive clusters seem to have a larger number of connected filaments than low-mass ones. Finally, our results suggest a gradient of galaxy activity in filaments around clusters.

mardi 10 mars 2020 - 11:15
Salle 281
Institut d'Astrophysique de Paris
Pages web du séminaire / Seminar's webpage