Rights statement: This is a pre-copy-editing, author-produced PDF of an article accepted for publication in Monthly Notices of the Royal Astronomical Society following peer review. The definitive publisher-authenticated version J. Molina, Edo Ibar, A. M. Swinbank, D. Sobral, P. N. Best, I. Smail, A. Escala, M. Cirasuolo; SINFONI-HiZELS: the dynamics, merger rates and metallicity gradients of ‘typical’ star-forming galaxies at z = 0.8–2.2. Mon Not R Astron Soc 2017; 466 (1): 892-905. doi: 10.1093/mnras/stw3120 is available online at: https://academic.oup.com/mnras/article/466/1/892/2627205/
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Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
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TY - JOUR
T1 - SINFONI-HiZELS
T2 - the dynamics, merger rates & metallicity gradients of typical star-forming galaxies at z = 0.8 - 2.2
AU - Molina, Juan
AU - Ibar, E.
AU - Swinbank, A. M.
AU - Sobral, David
AU - Best, P.
AU - Smail, Ian
AU - Cirasuolo, M.
N1 - This is a pre-copy-editing, author-produced PDF of an article accepted for publication in Monthly Notices of the Royal Astronomical Society following peer review. The definitive publisher-authenticated version J. Molina, Edo Ibar, A. M. Swinbank, D. Sobral, P. N. Best, I. Smail, A. Escala, M. Cirasuolo; SINFONI-HiZELS: the dynamics, merger rates and metallicity gradients of ‘typical’ star-forming galaxies at z = 0.8–2.2. Mon Not R Astron Soc 2017; 466 (1): 892-905. doi: 10.1093/mnras/stw3120 is available online at: https://academic.oup.com/mnras/article/466/1/892/2627205/
PY - 2017/4
Y1 - 2017/4
N2 - We present adaptive optics (AO) assisted SINFONI integral field unit (IFU) spectroscopy of 11 Hα emitting galaxies selected from the High-Z Emission Line Survey (HiZELS). We obtain spatially resolved dynamics on ∼kpc-scales of star-forming galaxies [stellar mass M⋆ = 109.5 − 10.5 M⊙ and star formation rate (SFR) = 2–30 M⊙ yr−1] near the peak of the cosmic star formation rate history. Combining these observations with our previous SINFONI-HiZELS campaign, we construct a sample of 20 homogeneously selected galaxies with IFU AO-aided observations – the ‘SHiZELS’ survey, with roughly equal number of galaxies per redshift slice, at z = 0.8, 1.47 and 2.23. We measure the dynamics and identify the major kinematic axis by modelling their velocity fields to extract rotational curves and infer their inclination-corrected rotational velocities. We explore the stellar mass Tully–Fisher relationship, finding that galaxies with higher velocity dispersions tend to deviate from this relation. Using kinemetry analyses, we find that galaxy interactions might be the dominant mechanism controlling the star formation activity at z = 2.23 but they become gradually less important down to z = 0.8. Metallicity gradients derived from the [N ii]/Hα emission line ratio show a median negative gradient for the SHiZELS survey of Δlog(O/H)/ΔR = −0.026 ± 0.008 dex kpc−1. We find that metal-rich galaxies tend to show negative gradients, whereas metal-poor galaxies tend to exhibit positive metallicity gradients. This result suggests that the accretion of pristine gas in the periphery of galaxies plays an important role in replenishing the gas in ‘typical’ star-forming galaxies.
AB - We present adaptive optics (AO) assisted SINFONI integral field unit (IFU) spectroscopy of 11 Hα emitting galaxies selected from the High-Z Emission Line Survey (HiZELS). We obtain spatially resolved dynamics on ∼kpc-scales of star-forming galaxies [stellar mass M⋆ = 109.5 − 10.5 M⊙ and star formation rate (SFR) = 2–30 M⊙ yr−1] near the peak of the cosmic star formation rate history. Combining these observations with our previous SINFONI-HiZELS campaign, we construct a sample of 20 homogeneously selected galaxies with IFU AO-aided observations – the ‘SHiZELS’ survey, with roughly equal number of galaxies per redshift slice, at z = 0.8, 1.47 and 2.23. We measure the dynamics and identify the major kinematic axis by modelling their velocity fields to extract rotational curves and infer their inclination-corrected rotational velocities. We explore the stellar mass Tully–Fisher relationship, finding that galaxies with higher velocity dispersions tend to deviate from this relation. Using kinemetry analyses, we find that galaxy interactions might be the dominant mechanism controlling the star formation activity at z = 2.23 but they become gradually less important down to z = 0.8. Metallicity gradients derived from the [N ii]/Hα emission line ratio show a median negative gradient for the SHiZELS survey of Δlog(O/H)/ΔR = −0.026 ± 0.008 dex kpc−1. We find that metal-rich galaxies tend to show negative gradients, whereas metal-poor galaxies tend to exhibit positive metallicity gradients. This result suggests that the accretion of pristine gas in the periphery of galaxies plays an important role in replenishing the gas in ‘typical’ star-forming galaxies.
KW - galaxies: abundances
KW - galaxies: evolution
KW - galaxies: high-redshift
KW - galaxies: interactions
KW - galaxies: ISM
KW - galaxies: star formation
U2 - 10.1093/mnras/stw3120
DO - 10.1093/mnras/stw3120
M3 - Journal article
VL - 466
SP - 892
EP - 905
JO - Monthly Notices of the Royal Astronomical Society
JF - Monthly Notices of the Royal Astronomical Society
SN - 0035-8711
IS - 1
ER -