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Durham University

Department of Physics

Staff profile

Publication details for Prof Richard Bower

Smith, J. K., Bunker, A. J., Vogt, N. P., Abraham, R. G., Aragón-Salamanca, A., Bower, R. G., Parry, I. R., Sharp, R. S. & Swinbank, A. M. (2004). Hα kinematics of a z∼ 1 disc galaxy from near‐infrared integral field spectroscopy. Monthly Notices of the Royal Astronomical Society 354(2): L19-L23.

Author(s) from Durham

Abstract

In this Letter we present the first 3D spectroscopic study of Hα emission in a z∼ 1 field galaxy with an integral field unit. Using the Cambridge Infrared Panoramic Survey Spectrograph (CIRPASS) on Gemini‐South, we map the spatial and velocity distribution of Hα emission in the z= 0.819 galaxy CFRS 22.1313. We detect two Hα emitting regions with a velocity separation of 220 ± 10 km s−1. Combining the 2D map of Hα emission with Hubble Space Telescope F814W imaging, we determine a lower limit of 180 ± 20 km s−1 for the rotation velocity of this MB(rest) ∼−21 galaxy. We note that our value is significantly higher than the rotation velocity of 120 ± 10 km s−1 reported by Barden et al. for their long‐slit spectroscopic study of this galaxy. Our lower limit on the rotation velocity is entirely consistent with no evolution of the rest B‐band Tully–Fisher relation. The position of this galaxy relative to the mean rest B‐band Tully–Fisher relation of Pierce & Tully is consistent with brightening of no more than ∼1 mag at z= 0.8. A larger integral field unit sample, without the uncertainties inherent to long‐slit samples, is needed to determine the evolution of the Tully–Fisher relation accurately out to z∼ 1.