A Virgo high-resolution H alpha kinematical survey

Chemin, L; Cayatte, V; Balkowski, C; Amram, P; Carignan, C; Boselli, A; Adami, C; Marcelin, M; Garrido, O; Hernandez, O; Boulesteix, J

Abstract

New Ha emission-line observations of the Virgo cluster galaxy NGC 4438 are presented. Fabry-Perot interferometry data at an effective angular resolution of similar to 2'' are used to map the kinematics of the ionized gas in the galaxy. For the first time we obtain a velocity field covering a large area in NGC 4438, much larger than that deduced from previous H. and CO maps. The kinematics of the extended, low surface brightness Ha filaments to the West of the galactic disk is discussed. We report on the discovery of a northern Ha structure which is clumpier than the other filaments. Evidence for multiple spectral components through the data-cube are presented in a nuclear shell and in the approaching half of the disk. The role of VCC 1040, a dwarf elliptical galaxy located to the South of NGC 4438, is presented to investigate the origin of a small-scale stellar tail of NGC 4438. It could be due to a minor tidal interaction between the two galaxies.

Más información

Título según WOS: ID WOS:000229475600018 Not found in local WOS DB
Título de la Revista: ASTRONOMY & ASTROPHYSICS
Volumen: 436
Número: 2
Editorial: EDP SCIENCES S A
Fecha de publicación: 2005
Página de inicio: 469
Página final: 478
DOI:

10.1051/0004-6361:20041664

Notas: ISI