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Title:
Hα kinematics of a z~ 1 disc galaxy from near-infrared integral field spectroscopy
Authors:
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.
Affiliation:
AA(Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge CB30HA), AB(Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge CB30HA; School of Physics, University of Exeter, Stocker Road, Exeter EX4 4QL), AC(Department of Astronomy, New Mexico State University, Las Cruces, NM 88003-8001, USA), AD(Department of Astronomy and Astrophysics, University of Toronto, 60 St. George Street, Toronto, ON M5S 3H8, Canada), AE(School of Physics and Astronomy, University of Nottingham, Nottingham NG7 2RD), AF(Department of Physics, University of Durham, South Road, Durham DH1 3LE), AG(Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge CB30HA), AH(Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge CB30HA; Anglo-Australian Observatory, PO Box 296, Epping, NSW 1710, Australia), AI(Department of Physics, University of Durham, South Road, Durham DH1 3LE)
Publication:
Monthly Notices of the Royal Astronomical Society, Volume 354, Issue 2, pp. L19-L23. (MNRAS Homepage)
Publication Date:
10/2004
Origin:
MNRAS
MNRAS Keywords:
instrumentation: spectrographs, galaxies: evolution, galaxies: individual: CFRS22.1313, galaxies: kinematics and dynamics, galaxies: spiral
DOI:
10.1111/j.1365-2966.2004.08323.x
Bibliographic Code:
2004MNRAS.354L..19S

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 kms-1. Combining the 2D map of Hα emission with Hubble Space Telescope F814W imaging, we determine a lower limit of 180 +/- 20 kms-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 kms-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 ~1mag 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.

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