| Autor: |
Ganda, Katia, Falcón-Barroso, Jesús, Peletier, Reynier F., Cappellari, Michele, Emsellem, Eric, McDermid, Richard M., Tim de Zeeuw, P., Carollo, C. Marcella |
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| Zdroj: |
Monthly Notices of the Royal Astronomical Society; 3/21/2006, Vol. 367 Issue 1, p46-78, 33p, 7 Diagrams, 4 Charts |
| Abstrakt: |
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, Mg b absorption features and the emission in the Hβ line and the and doublets over a 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. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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