2005/12/12 by K. Ganda, Katia Ganda, J. Falcón-Barroso +10 · 8 citations
Physics and Astronomy · #Astronomy #Astronomy and Astrophysical Research #Astrophysics #Bulge #Doubly ionized oxygen #Elliptical galaxy #Emission spectrum #Galaxies: Formation, Evolution, Phenomena #Galaxy #Luminous infrared galaxy #Milky Way #Physics #Spectral line #Spectrograph #Spiral galaxy #Star formation #Stellar kinematics #Stellar, planetary, and galactic studies #Velocity dispersion #William Herschel Telescope #astro-ph
paper · pdf · doi:10.1111/j.1365-2966.2005.09977.x
published as Mon.Not.Roy.Astron.Soc.367:46-78,2006 · 34 pages, 24 figures. Accepted for publication in MNRAS. A version with full resolution figures is available at http://www.strw.leidenuniv.nl/sauron/papers/ganda2005_late_types.pdf
arxiv created 2005/12/12 · openalex publication_date 2006/01/25 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
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.