Evidence for ram pressure stripping in a cluster of galaxies at z = 0.7 - Université Claude Bernard Lyon 1 Accéder directement au contenu
Article Dans Une Revue Astronomy and Astrophysics - A&A Année : 2019

Evidence for ram pressure stripping in a cluster of galaxies at z = 0.7

Résumé

MUSE observations of the cluster of galaxies CGr32 (M 200 2 × 10 14 M) at z = 0.73 reveal the presence of two massive star forming galaxies with extended tails of diffuse gas detected in the [O ii]λλ3727-3729Å emission-line doublet. The tails, which have a cometary shape with a typical surface brightness of a few 10 −18 erg s −1 cm −2 arcsec −2 , extend up to 100 kpc (projected distance) from the galaxy discs and are not associated to any stellar component. All this observational evidence suggests that the gas has been removed during a ram-pressure stripping event. This observation is thus the first evidence that dynamical interactions with the intracluster medium were active when the Universe had only half of its present age. The density of the gas derived using the observed [O ii]λ3729/[O ii]λ3726 line ratio implies a very short recombination time, suggesting that a source of ionisation is necessary to keep the gas ionised within the tail.
Fichier principal
Vignette du fichier
1909.05491.pdf (1.45 Mo) Télécharger le fichier
Origine : Fichiers éditeurs autorisés sur une archive ouverte
Loading...

Dates et versions

hal-02325571 , version 1 (22-10-2019)

Identifiants

Citer

A. Boselli, B. Epinat, T. Contini, V Abril-Melgarejo, L A Boogaard, et al.. Evidence for ram pressure stripping in a cluster of galaxies at z = 0.7. Astronomy and Astrophysics - A&A, 2019, 631, ⟨10.1051/0004-6361/201936133⟩. ⟨hal-02325571⟩
35 Consultations
44 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More