H-alpha rotation curves of z~1 galaxies: Unraveling the evolution of the Tully-Fisher relation - INSPIRE

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H-alpha rotation curves of z~1 galaxies: Unraveling the evolution of the Tully-Fisher relation

Feb, 2003

13 pages

e-Print:

astro-ph/0302392 [astro-ph]

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Abstract: (arXiv)

We describe the first results of a programme to obtain rotation curves of z~1 disc galaxies in the near-infrared using the Ha emission line in order to study the Tully-Fisher relation. To put any observed evolution into perspective and to investigate any possible selection biases, we constructed a control sample of low redshift galaxies that had rotation velocities and images available for measuring their dynamical, photometric, and morphological properties. Compared to local objects with isophotal sizes similar to the high redshift targets, we find that our sample of galaxies with spatially resolved rotation curves, the most distant sample so far (~0.9), clearly reveals a brightening of ~1.1 mag in the rest-frame B-band. The observed offset can be explained by a combination of increasing surface brightness, decreasing rotation speeds, and slightly smaller disc scale lengths of the high redshift galaxies.

Note:

Submitted to Astrophys.J.Lett.

GALAXIES EVOLUTION
GALAXIES KINEMATICS
GALAXIES DYNAMICS
GALAXIES SPIRAL

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