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Title:
Formation and evolution of S0 galaxies: a SAURON case study of NGC 7332
Authors:
Falcón-Barroso, Jesús; Peletier, Reynier F.; Emsellem, Eric; Kuntschner, Harald; Fathi, Kambiz; Bureau, Martin; Bacon, Roland; Cappellari, Michele; Copin, Yannick; Davies, Roger L.; de Zeeuw, Tim
Affiliation:
AA(School of Physics & Astronomy, University of Nottingham, Nottingham NG7 2RD; Sterrewacht Leiden, Niels Bohrweg 2, 2333 CA, Leiden, the Netherlands), AB(School of Physics & Astronomy, University of Nottingham, Nottingham NG7 2RD; CRAL, Observatoire de Lyon, F-69561 St-Genis Laval cedex, France), AC(CRAL, Observatoire de Lyon, F-69561 St-Genis Laval cedex, France), AD(Space Telescope European Coordinating Facility, European Southern Observatory, Karl-Schwarzschild-Str. 2, 85748 Garching, Germany), AE(School of Physics & Astronomy, University of Nottingham, Nottingham NG7 2RD; CRAL, Observatoire de Lyon, F-69561 St-Genis Laval cedex, France), AF(Columbia Astrophysics Laboratory, 550 West 120th Street, 1027 Pupin Hall, MC 5247, New York, NY 10027, USA), AG(CRAL, Observatoire de Lyon, F-69561 St-Genis Laval cedex, France), AH(Sterrewacht Leiden, Niels Bohrweg 2, 2333 CA, Leiden, the Netherlands), AI(Institut de physique nucleaire de Lyon, 4 rue Enrico Fermi, 69622 Villeurbanne Cedex, France), AJ(University of Oxford, Astrophysics, Keble Road, Oxford OX1 3RH), AK(Sterrewacht Leiden, Niels Bohrweg 2, 2333 CA, Leiden, the Netherlands)
Publication:
Monthly Notices of the Royal Astronomical Society, Volume 350, Issue 1, pp. 35-46. (MNRAS Homepage)
Publication Date:
05/2004
Origin:
MNRAS
MNRAS Keywords:
galaxies: elliptical and lenticular, cD, galaxies: evolution, galaxies: formation, galaxies: individual: NGC 7332, galaxies: kinematics and dynamics, galaxies: stellar content
DOI:
10.1111/j.1365-2966.2004.07704.x
Bibliographic Code:
2004MNRAS.350...35F

Abstract

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 Hβ 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.

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