Evolution in the Linewidth-Magnitude Relation to z > 1 from the DEEP Groth Strip Survey

Abstract.

Galaxy kinematics are potentially a powerful tool to measure the evolution of Tully-Fisher-type relations and to see how properties of distant galaxies correlate with mass. We have measured velocity widths from emission lines for field galaxies to z=1.3 in the HST Groth Survey Strip. At high redshifts, galaxies begin to deviate from the low-z relation: high redshift galaxies have lower linewidth or brighter magnitude, with $dM_B/dz \sim -2$. Possible explanations include: galaxies are brighter overall; there is a different high-z population; or that emission linewidths at $z \sim 1$ do not probe the full rotation velocity.