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Late-type galaxies observed with SAURON: two-dimensional stellar and emission-line kinematics of 18 spirals

Ganda, Katia ; Falcón-Barroso, Jesús ; Peletier, Reynier F. ; Cappellari, Michele ; Emsellem, Eric ; McDermid, Richard M. ; Tim de Zeeuw, P. ; Carollo, C. Marcella

In: Monthly Notices of the Royal Astronomical Society, 2006, vol. 367, no. 1, p. 46-78

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    Titre
    • Late-type galaxies observed with SAURON: two-dimensional stellar and emission-line kinematics of 18 spirals
    Auteur
    • Ganda, Katia. Kapteyn Astronomical Institute, Postbus 800, 9700 AV Groningen, the Netherlands
    • Falcón-Barroso, Jesús. Leiden Observatory, Postbus 9513, 2300 RA Leiden, the Netherlands
    • Peletier, Reynier F.. Kapteyn Astronomical Institute, Postbus 800, 9700 AV Groningen, the Netherlands
    • Cappellari, Michele. Leiden Observatory, Postbus 9513, 2300 RA Leiden, the Netherlands
    • Emsellem, Eric. Centre de Recherche Astrophysique de Lyon — Observatoire, 9 Avenue Charles André, 69230 Saint Genis Laval, France
    • McDermid, Richard M.. Leiden Observatory, Postbus 9513, 2300 RA Leiden, the Netherlands
    • Tim de Zeeuw, P.. Leiden Observatory, Postbus 9513, 2300 RA Leiden, the Netherlands
    • Carollo, C. Marcella. Eidgenössische Technische Hochschule Zurich, Hönggerberg HPF G4.3, CH-8092 Zurich, Switzerland
    Type de document
    • Postprint
    Langue
    • Anglais
    Publié dans
    • Monthly Notices of the Royal Astronomical Society, 2006, vol. 367, no. 1, p. 46-78. Blackwell Science Ltd
    Autre version électronique
    Identifiant OAI-PMH
    • oai:doc.rero.ch:297327
    Summary
    We present the stellar and gas kinematics of a sample of 18 nearby late-type spiral galaxies (Hubble types ranging from Sb to Sd), observed with the integral-field spectrograph SAURON at the 4.2-m William Herschel Telescope. SAURON covers the spectral range 4800-5380 Å, allowing us to measure the Hβ, Fe, Mgb absorption features and the emission in the Hβ line and the [O iii]λλ4959, 5007 Å and [N i]λλ5198, 5200 Å doublets over a 33 × 41-arcsec2 field of view. The maps cover the nuclear region of these late-type galaxies and in all cases include the entire bulge. In many cases the stellar kinematics suggests the presence of a cold inner region, as visible from a central drop in the stellar velocity dispersion. The ionized gas is almost ubiquitous and behaves in a complicated fashion: the gas velocity fields often display more features than the stellar ones, including wiggles in the zero-velocity lines, irregular distributions, ring-like structures. The line ratio [O iii]/Hβ often takes on low values over most of the field, probably indicating a wide-spread star formation