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H? kinematics of a z~ 1 disc galaxy from near-infrared integral field spectroscopy
In this Letter we present the first 3D spectroscopic study of H?emission in a z~ 1 field galaxy with an integral field unit. Using theCambridge Infrared Panoramic Survey Spectrograph (CIRPASS) onGemini-South, we map the spatial and velocity distribution of H?emission in the z= 0.819 galaxy CFRS 22.1313. We detect two H?emitting regions with a velocity separation of 220 +/- 10kms-1. Combining the 2D map of H? emission with HubbleSpace Telescope F814W imaging, we determine a lower limit of 180 +/- 20kms-1 for the rotation velocity of this MB(rest)~-21 galaxy. We note that our value is significantly higher than therotation velocity of 120 +/- 10 kms-1 reported by Barden etal. for their long-slit spectroscopic study of this galaxy. Our lowerlimit on the rotation velocity is entirely consistent with no evolutionof the rest B-band Tully-Fisher relation. The position of this galaxyrelative to the mean rest B-band Tully-Fisher relation of Pierce &Tully is consistent with brightening of no more than ~1mag at z= 0.8. Alarger integral field unit sample, without the uncertainties inherent tolong-slit samples, is needed to determine the evolution of theTully-Fisher relation accurately out to z~ 1.
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