The Fornax3D project: Tracing the assembly history of the cluster from the kinematic and line-strength maps

E. Iodice, M. Sarzi, A. Bittner, L. Coccato, L. Costantin, E. M. Corsini, G. van de Ven, P. T. de Zeeuw, J. Falcón-Barroso, D. A. Gadotti, M. Lyubenova, I. Martín-Navarro, R. M. McDermid, B. Nedelchev, F. Pinna, A. Pizzella, M. Spavone, S. Viaene

The 31 brightest galaxies (mB ≤ 15 mag) inside the virial radius of the Fornax cluster were observed from the centres to the outskirts with the Multi Unit Spectroscopic Explorer on the Very Large Telescope. These observations provide detailed high-resolution maps of the line-of-sight kinematics, line strengths of the stars, ionised gas reaching 2-3 Re for 21 early-type galaxies, and 1-2 Re for 10 late-type galaxies. The majority of the galaxies are regular rotators, with eight hosting a kinematically distinct core. Only two galaxies are slow rotators. The mean age, total metallicity, and [Mg/Fe] abundance ratio in the bright central region inside 0.5 Re and in the galaxy outskirts are presented. Extended emission-line gas is detected in 13 galaxies, most of them are late-type objects with wide-spread star formation. The measured structural properties are analysed in relation to the galaxies' position in the projected phase space of the cluster. This shows that the Fornax cluster appears to consist of three main groups of galaxies inside the virial radius: the old core; a clump of galaxies, which is aligned with the local large-scale structure and was accreted soon after the formation of the core; and a group of galaxies that fell in more recently.

Institut für Astrophysik
Externe Organisation(en)
INAF Astronomical Observatory of Capodimonte, Armagh Observatory and Planetarium, European Southern Observatory (Germany), Ludwig-Maximilians-Universität München, INAF Osservatorio Astronomico di Brera, Università degli Studi di Padova, INAF - Osservatorio Astronomico di Padova, Leiden Observatory Research Institute, Max-Planck-Institut für extraterrestrische Physik, Instituto de Astrofísica de Canarias, Universidad de La Laguna, University of California Observatories/Lick Observatory, University of California, Max-Planck-Institut für Astronomie, Macquarie University, Australian Astronomical Observatory, University of Hertfordshire, Ghent University
Astronomy & Astrophysics
ÖFOS 2012
Astronomie, Astrophysik
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