The Rotation Curves of Galaxies at Intermediate Redshift

Abstract

We have undertaken a pilot project to measure the rotation velocities of spiral galaxies in the redshift range 0.18 < z < 0.4 using high dispersion long slit spectroscopy obtained with the Palomar 5m telescope. One field galaxy and three cluster objects known to have strong emission lines were observed over wavelength ranges covering the redshifted lines of [OII], CaII K, H beta, and [OIII]. Two of the objects show extended line emission that allows the tracing of the rotation curve in one or more lines. A line width similar to that obtained with single dish telescopes for the 21-cm HI line observed in lower redshift galaxies can be derived from the observed H beta, [OII], and [OIII] emission by measuring a characteristic width from the velocity histogram. These moderately distant galaxies have much stronger emission lines than typical low-redshift spirals but they appear to be kinematically similar. Application of the Tully-Fisher relation suggests that the two galaxies with rotation curves are intrinsically brighter at R-band than nearby galaxies.

Text is 15 pages (18 with figures). Full text and postscript figures are also available at http://www.ucolick.org/~nicole/pubs/pubs.html#highz1

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• IMAGES-III: The evolution of the Near-Infrared Tully-Fisher relation over the last 6 Gyr
• Internal Kinematics of Galaxies at z=0.25-0.45
• Rotation and Mass in the Milky Way and Spiral Galaxies
• The Norris Survey of the Corona Borealis Supercluster: II. Galaxy Evolution with Redshift and Environment
• The Tully-Fisher Relation in Cluster Cl0024+1654 at z=0.4
• A novel approach for calculating galaxy rotation curves using spaxel cross-correlation and iterative smoothing
• The Tully-Fisher Relation at Intermediate Redshifts