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Title:
Late-type galaxies observed with SAURON: two-dimensional stellar and emission-line kinematics of 18 spirals
Authors:
Ganda, Katia; Falcón-Barroso, Jesús; Peletier, Reynier F.; Cappellari, Michele; Emsellem, Eric; McDermid, Richard M.; de Zeeuw, P. Tim; Carollo, C. Marcella
Affiliation:
AA(Kapteyn Astronomical Institute, Postbus 800, 9700 AV Groningen, the Netherlands), AB(Leiden Observatory, Postbus 9513, 2300 RA Leiden, the Netherlands), AC(Kapteyn Astronomical Institute, Postbus 800, 9700 AV Groningen, the Netherlands), AD(Leiden Observatory, Postbus 9513, 2300 RA Leiden, the Netherlands), AE(Centre de Recherche Astrophysique de Lyon - Observatoire, 9 Avenue Charles André, 69230 Saint Genis Laval, France), AF(Leiden Observatory, Postbus 9513, 2300 RA Leiden, the Netherlands), AG(Leiden Observatory, Postbus 9513, 2300 RA Leiden, the Netherlands), AH(Eidgenössische Technische Hochschule Zurich, Hönggerberg HPF G4.3, CH-8092 Zurich, Switzerland)
Publication:
Monthly Notices of the Royal Astronomical Society, Volume 367, Issue 1, pp. 46-78. (MNRAS Homepage)
Publication Date:
03/2006
Origin:
MNRAS
MNRAS Keywords:
galaxies: bulges-galaxies: evolution-galaxies: formation-galaxies: kinematics and dynamics-galaxies: spiral
DOI:
10.1111/j.1365-2966.2005.09977.x
Bibliographic Code:
2006MNRAS.367...46G

Abstract

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 4800-5380Å, allowing us to measure the Hβ, Fe, Mgb absorption features and the emission in the Hβ line and the [OIII]λλ4959, 5007Å and [NI]λλ5198, 5200Å 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 [OIII]/Hβ often takes on low values over most of the field, probably indicating a wide-spread star formation.

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