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.

By M. Swinbank, D. Sobral, I. Smail, James E. Geach, P. Best, Ian G. McCarthy, Robert A. Crain, Tom Theuns, Icc, Durham and 6 more. 2012

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We present adaptive optics assisted, spatially resolved spectroscopy of a sample of nine H�-selected galaxies at z =0.84–2.23 drawn from the HiZELS narrow-band survey. These galaxies have star-formation rates of 1–27M⊙ 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 ionised gas is in large, rotating disks. 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 2.5 between z =2 and z =0, whilst the rest-frame B-band luminosity has decreased by a factor �6 over the same period. Together, these demonstrate a change in mass-to-light ratio in the B-band of �(M/ LB) / (M/ LB)z=0 �3.5 between z =1.5 and z =0, with most of the evolution occuring below z =1. We also use the spatial variation of [Nii] /H� to show that the metallicity of the ionised gas in these galaxies declines monotonically with galactocentric radius, with an average �log(O/H) /�R=−0.027±0.005 dex kpc−1. This gradient is consistent with predictions for high-redshift disk galaxies from cosmologically based hydrodynamic simulations. Key words: galaxies: evolution – galaxies: formation – galaxies: high-redshift

Subfields: Astronomy and Astrophysics

View Paper: https://www.semanticscholar.org/paper/e78f1a620a05b54851cb1c8633fa0f8115977045

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In Astronomy and Astrophysics

1. P. Hopkins
2. L. Hernquist
3. P. V. van Dokkum
4. R. Dav'e
5. C. Conroy
6. D. M. Alexander
7. A. Dekel
8. R. Somerville

Citations in the corpus

• A CANDELS–3D-HST SYNERGY: RESOLVED STAR FORMATION PATTERNS AT 0.7 < z < 1.5 (2013, background): “In reality, [NII]/Hα ratios may vary between galaxies as well as spatially within galaxies (see, e.g., Liu et al. 2008; Yuan et al. 2012, 2013; Queyrel et al. 2012; Swinbank et al. 2012; Jones et al. 2013; Förster Schreiber et al. 2013).”
• The KMOS Redshift One Spectroscopic Survey (KROSS):dynamical properties, gas and dark matter fractions of typical z~1 star-forming galaxies (2016, methodology): “…galaxies Stellar population and Dynamics (LSD)]; Queyrel et al. 2012; Epinat et al. 2012; Contini et al. 2012 [Mass Assembly Survey with SINFONI in VVDS (MASSIV)]; Swinbank et al. 2012a,b [SINFONI observations of High-Z Emission Line Survey (SHiZELS) galaxies]; Law et al. 2009; Wright et al. 2009).”
• The SINS/zC-SINF Survey of z ∼ 2 Galaxy Kinematics: SINFONI Adaptive Optics–assisted Data and Kiloparsec-scale Emission-line Properties (2018, methodology): “Twenty Hα-selected galaxies from the HiZELS narrow-band survey were observed with AO as part of the “sHiZELS” project, with six z ≈ 0.8, eight z ≈ 1.47, and six z ≈ 2.23 galaxies (Swinbank et al. 2012b,a; Molina et al. 2017).”
• Ionized gas outflows and global kinematics of low-z luminous star-forming galaxies (2014, methodology): “Similar trends have been proposed by Wisnioski et al. (2012) (i.e. n=0.6) and Swinbank et al. (2012b) (n=0.7) for other highz samples based on Hα IFS observations.”
• KILOPARSEC-SCALE DUST DISKS IN HIGH-REDSHIFT LUMINOUS SUBMILLIMETER GALAXIES (2016, background): “In particular, studies of the ionized gas kinematics in such galaxies have uncovered a high fraction of large rotating disks among the massive, optically–bright systems (e.g., Förster Schreiber et al. 2006; Shapiro et al. 2008; Swinbank et al. 2012).”
• VLT/VIMOS integral field spectroscopy of luminous and ultraluminous infrared galaxies: 2D kinematic properties (2013, unknown): “This is the case of several AOassisted IFS works of high-z SFG samples (e.g., Law et al. 2007; Förster Schreiber et al. 2009; Swinbank et al. 2012), whichcan reach a sub-kpc scale of the order of those of low-z (U)LIRGs observed under seeing-limited conditions.”
• EVIDENCE FOR WIDE-SPREAD ACTIVE GALACTIC NUCLEUS-DRIVEN OUTFLOWS IN THE MOST MASSIVE z ∼ 1–2 STAR-FORMING GALAXIES (2014, background): “…any firm conclusion on the incidence and properties of the detected nuclear outflows, although an inspection of various other z ∼ 2 small galaxy samples in the literature (Erb et al. 2006; Kriek et al. 2007; Swinbank et al. 2012, as discussed in FS14a) are consistent with a fairly large incidence.”
• THEORETICAL EVOLUTION OF OPTICAL STRONG LINES ACROSS COSMIC TIME (2013, background): “…in some high redshift lensed isolated star-forming galaxies appear to be significantly steeper than local galaxies (Yuan et al. 2011; Jones et al. 2013), but in other high redshift galaxies, the gradients appear to be flat or inverted (Cresci et al. 2010; Swinbank et al. 2012; Queyrel et al. 2012).”
• Metallicity gradients in local field star-forming galaxies: insights on inflows, outflows, and the coevolution of gas, stars and metals (2015, background): “…important implications for metallicity gradient studies at high redshift, where typically only [N II ] λλ6548,6583 and Hα are available (in some cases also [OIII ] λλ4959,5007 and Hβ, e.g.,Cresci et al. 2010; Yuan et al. 2011; Jones et al. 2010, 2013; Queyrel et al. 2012; Swinbank et al. 2012).”
• TRACING CHEMICAL EVOLUTION OVER THE EXTENT OF THE MILKY WAY'S DISK WITH APOGEE RED CLUMP STARS (2014, background): “Rotationally-dominated disks observed at z ∼ 2 exhibit large random motions, and are geometrically thick relative to local galaxies in both ionized (e.g., Epinat et al. 2012; Genzel et al. 2008, ; and references therein) and molecular (e.g., Swinbank et al. 2012; Tacconi et al. 2013) gas studies.”
• SDSS-IV MaNGA : the impact of diffuse ionized gas on emission-line ratios, interpretation of diagnostic diagrams and gas metallicity measurements (2016, background): “There is debate wether the metallicity gradients at high redshift are flatter or steeper (Yuan et al. 2011; Swinbank et al. 2012; Jones et al. 2013, 2015; Leethochawalit et al.”