A Virgo Environmental Survey Tracing Ionised Gas Emission (VESTIGE)
COMBES, F.
Laboratoire d'Etude du Rayonnement et de la Matière en Astrophysique [LERMA]
Collège de France - Chaire Galaxies et cosmologie
Laboratoire d'Etude du Rayonnement et de la Matière en Astrophysique [LERMA]
Collège de France - Chaire Galaxies et cosmologie
DUC, P.A.
Département d'Astrophysique, de physique des Particules, de physique Nucléaire et de l'Instrumentation Associée [DAPNIA]
< Réduire
Département d'Astrophysique, de physique des Particules, de physique Nucléaire et de l'Instrumentation Associée [DAPNIA]
Langue
en
Article de revue
Ce document a été publié dans
Astronomy and Astrophysics - A&A. 2019-03, vol. 623, p. A52
EDP Sciences
Résumé en anglais
We observed the giant elliptical galaxy M 87 during the Virgo Environmental Survey Tracing Galaxy Evolution (VESTIGE), a blind narrow-band Hα+[NII] imaging survey of the Virgo cluster carried out with MegaCam at the Canada ...Lire la suite >
We observed the giant elliptical galaxy M 87 during the Virgo Environmental Survey Tracing Galaxy Evolution (VESTIGE), a blind narrow-band Hα+[NII] imaging survey of the Virgo cluster carried out with MegaCam at the Canada French Hawaii Telescope (CFHT). The deep narrow-band image confirmed the presence of a filament of ionised gas extending up to ≃3 kpc in the north-western direction and ≃8 kpc to the southeast, with a couple of plumes of ionised gas, the weakest of which, at ≃18 kpc from the nucleus, was previously unknown. The analysis of deep optical images taken from the NGVS survey confirms that this gas filament is associated with dust seen in absorption which is now detected up to ≃2.4 kpc from the nucleus. We also analysed the physical and kinematical properties of the ionised gas filament using deep IFU MUSE data covering the central 4.8 × 4.8 kpc2 of the galaxy. The spectroscopic data confirm a perturbed kinematics of the ionised gas, with differences in velocity of ≃700–800 km s−1 on scales of ≲1 kpc. The analysis of 2D diagnostic diagrams and the observed relationship between the shock-sensitive [OI]/Hα line ratio and the velocity dispersion of the gas suggest that the gas is shock-ionised.< Réduire
Mots clés en anglais
Astrophysics - Astrophysics of Galaxies
galaxies: clusters: general
galaxies: clusters: individual: Virgo
galaxies: evolution
galaxies: interactions
galaxies: ISM
galaxies: individual: M 87
Origine
Importé de halUnités de recherche