Formation and evolution of S0 galaxies: a SAURON case study of NGC 7332 - IN2P3 - Institut national de physique nucléaire et de physique des particules
Article Dans Une Revue Monthly Notices of the Royal Astronomical Society Année : 2004

Formation and evolution of S0 galaxies: a SAURON case study of NGC 7332

J. Falcón-Barroso
  • Fonction : Auteur
R.F. Peletier
  • Fonction : Auteur
E. Emsellem
H. Kuntschner
  • Fonction : Auteur
K. Fathi
  • Fonction : Auteur
M. Bureau
  • Fonction : Auteur
R. Bacon
  • Fonction : Auteur
M. Cappellari
  • Fonction : Auteur
Y. Copin
R.L. Davies
  • Fonction : Auteur
Tim de Zeeuw

Résumé

We present SAURON integral-field observations of the S0 galaxy NGC 7332. Existing broad-band ground-based and Hubble Space Telescope (HST) photometry reveals a double-disc structure and a boxy bulge interpreted as a bar viewed close to edge-on. The SAURON two-dimensional stellar kinematic maps confirm the existence of the bar and inner disc but also uncover the presence of a cold counter-rotating stellar component within the central 250 pc. The Hbeta and [O iii] emission line maps show that the ionized gas has a complex morphology and kinematics, including both a component counter-rotating with respect to the stars and a fainter corotating one. Analysis of the absorption line-strength maps show that NGC 7332 is young everywhere. The presence of a large-scale bar can explain most of those properties, but the fact that we see a significant amount of unsettled gas, together with a few peculiar features in the maps, suggests that NGC 7332 is still evolving. Interactions as well as bar-driven processes must thus have played an important role in the formation and evolution of NGC 7332, and presumably of S0 galaxies in general.

Dates et versions

in2p3-00024661 , version 1 (23-09-2005)

Identifiants

Citer

J. Falcón-Barroso, R.F. Peletier, E. Emsellem, H. Kuntschner, K. Fathi, et al.. Formation and evolution of S0 galaxies: a SAURON case study of NGC 7332. Monthly Notices of the Royal Astronomical Society, 2004, 350, pp.35-46. ⟨10.1111/j.1365-2966.2004.07704.x⟩. ⟨in2p3-00024661⟩
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