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| Paper: |
Distant Disk Galaxies: Kinematics and Evolution to z ~1 |
| Volume: |
197, XVth IAP Meeting Dynamics of Galaxies: From the Early Universe to the Present |
| Page: |
435 |
| Authors: |
Vogt, Nicole P. |
| Abstract: |
High resolution HST images have been combined with Keck 10m telescope spectra to study the internal kinematics of 100 faint disk galaxies in the redshift range 0.2 <= z <= 1. These data form a high redshift Tully-Fisher relation that spans five magnitudes and extends to well below L*, with no obvious change in shape or slope with respect to the local Tully-Fisher relation for the bulk of the observed population. The small offset of < 0.2 B mag can be attributed to strong brightening of a fraction of the low mass galaxy population at redshifts z >= 0.5. A comparison of disk surface brightness between local and high redshift samples yields a similar offset of <= 0.3 B mag, one that increases more smoothly with redshift. These results provide further evidence for only a modest increase in luminosity with lookback time for this population. The change in disk size with redshift for disks of a given mass is then examined, to test current models for the formation of galactic disks which suggest that high redshift spirals are substantially smaller than nearby counterparts. |
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