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

Details Late-type galaxies observed with SAURON. Two-dimensional stellar and emission-line kinematics of 18 spirals Late-type galaxies observed with SAURON. Two-dimensional stellar and emission-line kinematics of 18 spirals

2005-12-12

arxiv.org/abs/astro-ph/0512304v1

Mon.Not.Roy.Astron.Soc.367:46-78,2006

Astronomy and Astrophysics

Astrophysics

34 pages, 24 figures. Accepted for publication in MNRAS. A version with full resolution figures is available at http://www.s

Scientific paper

10.1111/j.1365-2966.2005.09977.x

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 A, allowing us to measure the Hbeta, Fe, Mgb absorption features and the emission in the Hbeta line and the [OIII], and [NI] doublets over a 33x41 arcsec 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 ionised 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]/Hbeta often takes on low values over most of the field, probably indicating a wide-spread star formation.

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