Abstract
We present the "SINS/zC-SINF AO survey" of 35 star-forming galaxies, the largest sample with deep adaptive optics (AO)-assisted near-infrared integral field spectroscopy at z ∼2. The observations, taken with SINFONI at the Very Large Telescope, resolve the Hα and [N ii] emission and kinematics on scales of ∼1.5 kpc. The sample probes the massive (M ∗ ∼ 2 × 109 - 3 × 1011 M o), actively star-forming (SFR ∼ 10-600 M o yr-1) part of the z ∼2 galaxy population over a wide range of colors ((U - V)rest ∼0.15-1.5 mag) and half-light radii (R e,H ∼ 1-8.5 kpc). The sample overlaps largely with the "main sequence" of star-forming galaxies in the same redshift range to a similar K AB = 23 mag limit; it has ∼0.3 dex higher median specific SFR, ∼0.1 mag bluer median (U - V)rest color, and ∼10% larger median rest-optical size. We describe the observations, data reduction, and extraction of basic flux and kinematic properties. With typically 3-4 times higher resolution and 4-5 times longer integrations (up to 23 hr) than the seeing-limited data sets of the same objects, the AO data reveal much more detail in morphology and kinematics. The complete AO observations confirm the majority of kinematically classified disks and the typically elevated disk velocity dispersions previously reported based on subsets of the data. We derive typically flat or slightly negative radial [N ii]/ gradients, with no significant trend with global galaxy properties, kinematic nature, or the presence of an AGN. Azimuthal variations in [N ii]/ are seen in several sources and are associated with ionized gas outflows and possibly more metal-poor star-forming clumps or small companions. The reduced AO data are made publicly available (http://www.mpe.mpg.de/ir/SINS/SINS-zcSINF-data).
Original language | English |
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Article number | 21 |
Journal | Astrophysical Journal, Supplement Series |
Volume | 238 |
Issue number | 2 |
DOIs | |
Publication status | Published - 4 Oct 2018 |
Funding
We wish to thank the ESO staff for excellent support during the many observing campaigns over which the SINFONI data were obtained. Special thanks to J. Navarrete for always enthusiastic help and discussions. We also thank the SINFONI and PARSEC teams for their hard work on the instrument and laser, which allowed our programs to be carried out successfully. We thank the referee for a careful reading of the manuscript and useful suggestions that helped improve the quality and presentation of the paper. This paper and the SINS/ zC-SINF survey have benefited from many stimulating discussions with many colleagues, especially M. Franx, P. van Dokkum, M. Bureau, S. Courteau, L. Kewley, A. Dekel, and E. Wisnioski. NMFS acknowledges support by the Minerva Program of the Max-Planck-Gesellschaft and the Schwerpunkt Programme SPP1177 of the Deutsche For-schungsgemeinschaft. AR and CM acknowledge support from INAF-PRIN 2008 and 2012; AR also acknowledges support from INAF-PRIN 2014 and 2017 and is grateful for the kind hospitality of the Excellence Cluster universe (Garching) and the Max-Planck-Institut für Extraterrestrische Physik while working on the early and final versions of this paper. YP acknowledges support from the National Key Program for Science and Technology Research and Development under grant No. 2016YFA0400702 and NSFC grant No. 11773001. AC acknowledges the grants ASI n.I/023/12/0 “Attività relative alla fase B2/C per la missione Euclid” and PRIN MIUR 2015 “Cosmology and Fundamental Physics: illuminating the Dark universe with Euclid.”
Keywords
- galaxies: high-redshift
- galaxies: ISM
- galaxies: kinematics and dynamics
- galaxies: structure
ASJC Scopus subject areas
- Astronomy and Astrophysics
- Space and Planetary Science