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

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

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

88 Citations (Scopus)

Abstract

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 4800-5380 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.

Original languageEnglish
Pages (from-to)46-78
Number of pages33
JournalMonthly Notices of the Royal Astronomical Society
Volume367
Issue number1
DOIs
Publication statusPublished - Mar 2006
Externally publishedYes

Keywords

  • Galaxies: bulges
  • Galaxies: evolution
  • Galaxies: formation
  • Galaxies: kinematics and dynamics
  • Galaxies: spiral

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