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Title:
The properties of the star-forming interstellar medium at z = 0.84-2.23 from HiZELS: mapping the internal dynamics and metallicity gradients in high-redshift disc galaxies
Authors:
Swinbank, A. M.; Sobral, D.; Smail, Ian; Geach, J. E.; Best, P. N.; McCarthy, I. G.; Crain, R. A.; Theuns, T.
Affiliation:
AA(Institute for Computational Cosmology, Durham University, South Road Durham, DH1 3LE), AB(Leiden Observatory, Leiden University, PO Box 9513 2300 RA Leiden, the Netherlands), AC(Institute for Computational Cosmology, Durham University, South Road Durham, DH1 3LE), AD(Department of Physics, McGill University, Ernest Rutherford Building, 3600 Rue University Montreal, Quebec H3A 2T8 Canada), AE(SUPA, Institute for Astronomy, University of Edinburgh, Edinburgh, EH19 3HJ), AF(School of Physics and Astronomy, University of Birmingham, Edgbaston Birmingham, B15 2TT), AG(Leiden Observatory, Leiden University, PO Box 9513 2300 RA Leiden, the Netherlands), AH(Institute for Computational Cosmology, Durham University, South Road Durham, DH1 3LE; University of Antwerp, Campus Groenenborger, Groenenborgerlaan 171 B-2020 Antwerp, Belgium)
Publication:
Monthly Notices of the Royal Astronomical Society, Volume 426, Issue 2, pp. 935-950. (MNRAS Homepage)
Publication Date:
10/2012
Origin:
WILEY
Astronomy Keywords:
galaxies: evolution, galaxies: formation, galaxies: high-redshift
DOI:
10.1111/j.1365-2966.2012.21774.x
Bibliographic Code:
2012MNRAS.426..935S

Abstract

We present adaptive optics assisted, spatially resolved spectroscopy of a sample of nine Halpha-selected galaxies at z = 0.84-2.23 drawn from the HiZELS narrow-band survey. These galaxies have star formation rates of 1-27 M&sun; yr-1 and are therefore representative of the typical high-redshift star-forming population. Our ˜kpc-scale resolution observations show that approximately half of the sample have dynamics suggesting that the ionized gas is in large, rotating discs. We model their velocity fields to infer the inclination-corrected, asymptotic rotational velocities. We use the absolute B-band magnitudes and stellar masses to investigate the evolution of the B-band and stellar-mass Tully-Fisher relationships. By combining our sample with a number of similar measurements from the literature, we show that, at fixed circular velocity, the stellar mass of star-forming galaxies has increased by a factor of 2.5 between z = 2 and 0, whilst the rest-frame B-band luminosity has decreased by a factor of ˜ 6 over the same period. Together, these demonstrate a change in mass-to-light ratio in the B band of Delta(M/LB)/(M/LB)z=0 ˜ 3.5 between z = 1.5 and 0, with most of the evolution occurring below z = 1. We also use the spatial variation of [N II]/Halpha to show that the metallicity of the ionized gas in these galaxies declines monotonically with galactocentric radius, with an average Delta log(O/H)/DeltaR = -0.027 ± 0.005 dex kpc-1. This gradient is consistent with predictions for high-redshift disc galaxies from cosmologically based hydrodynamic simulations.
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