Velocity Fields of Spiral Galaxies in z~0.5 Clusters

Details Velocity Fields of Spiral Galaxies in z~0.5 Clusters Velocity Fields of Spiral Galaxies in z~0.5 Clusters

2007-01-31

arxiv.org/abs/astro-ph/0701918v1

Astronomy and Astrophysics

Astrophysics

2 pages, 2 figures, going to be published in the proceedings of the IAU Symp. 241, "Stellar Populations as Building Blocks of

Scientific paper

10.1017/S1743921307009155

Spiral galaxies can be affected by interactions in clusters, that also may distort the internal velocity field. If unrecognized from single-slit spectroscopy, this could lead to a wrong determination of the maximum rotation velocity as pointed out by Ziegler et al. (2003). This parameter directly enters into the Tully-Fisher relation, an important tool to investigate the evolution of spiral galaxies. To overcome this problem, we measure the 2D-velocity fields by observing three different slit positions per galaxy using FORS2 at the VLT providing us with full coverage of each galaxy and an adequate spatial resolution. The kinematic properties are compared to structural features determined on the HST/ACS images to assess possible interaction processes. As a next step, the whole analysis will be performed for three more clusters, so that we will be able to establish a high-accuracy TFR for spirals at z~0.5.

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