Scaling relations of field spirals at intermediate redshift |
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Authors: | A Böhm BL Ziegler KJ Fricke the FDF Team |
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Institution: | 1. Universit?tssternwarte G?ttingen, Geismarlandstr. 11, 37083, G?ttingen, Germany 2. Landessternwarte Heidelberg, Universit?tssternwarte München, Germany
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Abstract: | In the last few years, galaxies at redshifts up to z ∼ 1 have become accessible for medium-resolved spectroscopy thanks to the new generation of 10 m-class telescopes. With kinematic
and photometric information on spiral galaxies in this regime, well-known scaling relations like the Tully-Fisher relation
(TFR) can be studied over half a Hubble time. By comparison to local samples, these studies facilitate simultaneous tests
of the hierarchical merging scenario and stellar population models. Using the Very Large Telescope, we obtained spatially
resolved rotation curves of 78 spiral galaxies in the FORS Deep Field (FDF), covering all Hubble types from Sa to Sm/Irr at
redshifts 0.1 < z < 1.0. We find evidence for a B-band luminosity increase of up to 2 mag for low-mass spirals, whereas the most massive galaxies are of the same luminosity
as their local counterparts. In effect, the TFR slope decreases significantly. This would explain the discrepant results of
previous observational studies. We also present the velocity-size relation and compare it to the predictions of numerical
simulations based on the hierarchical merging scenario.
This revised version was published online in August 2006 with corrections to the Cover Date. |
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Keywords: | galaxy evolution cosmology |
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