Integral Field Spectroscopy of High-Redshift Star Forming Galaxies with Laser Guided Adaptive Optics: Evidence for Dispersion-Dominated Kinematics

Abstract

We present early results from an ongoing study of the kinematic structure of star-forming galaxies at redshift z ~ 2 - 3 using integral-field spectroscopy of rest-frame optical nebular emission lines in combination with Keck laser guide star adaptive optics (LGSAO). We show kinematic maps of 3 target galaxies Q1623-BX453, Q0449-BX93, and DSF2237a-C2 located at redshifts z = 2.1820, 2.0067, and 3.3172 respectively, each of which is well-resolved with a PSF measuring approximately 0.11 - 0.15 arcsec (~ 900 - 1200 pc at z ~ 2-3) after cosmetic smoothing. Neither galaxy at z ~ 2 exhibits substantial kinematic structure on scales >~ 30 km/s; both are instead consistent with largely dispersion-dominated velocity fields with sigma ~ 80 km/s along any given line of sight into the galaxy. In contrast, DSF2237a-C2 presents a well-resolved gradient in velocity over a distance of ~ 4 kpc with peak-to-peak amplitude of 140 km/s. It is unlikely that DSF2237a-C2 represents a dynamically cold rotating disk of ionized gas as the local velocity dispersion of the galaxy (sigma = 79 km/s) is comparable to the observed shear. Using extant multi-wavelength spectroscopy and photometry we relate these kinematic data to physical properties such as stellar mass, gas fraction, star formation rate, and outflow kinematics and consider the applicability of current galaxy formation models.[Abridged]

19 pages, 10 figures (5 color); accepted for publication in ApJ. Version with full-resolution figures is available at http://www.astro.caltech.edu/~drlaw/Papers/OSIRIS_data1.pdf

References in corpus (9)

• The Mass-Metallicity Relation at z~2
• A primer on hierarchical galaxy formation: the semi-analytical approach
• The Stellar, Gas and Dynamical Masses of Star-Forming Galaxies at z~2
• The rapid formation a large rotating disk galaxy three billion years after the Big Bang
• H-alpha Observations of a Large Sample of Galaxies at z~2: Implications for Star Formation in High Redshift Galaxies
• The Gemini Deep Deep Survey: III. The abundance of massive galaxies 3-6 billion years after the Big Bang
• A method to remove residual OH emission from near infrared spectra
• A Survey of Galaxy Kinematics to z ~ 1 in the TKRS/GOODS-N Field. I. Rotation and Dispersion Properties
• The Physical Nature of Rest-UV Galaxy Morphology During the Peak Epoch of Galaxy Formation

Cited by in corpus (37)

• From rings to bulges: evidence for rapid secular galaxy evolution at z~2 from integral field spectroscopy in the SINS survey
• The KMOS^3D Survey: design, first results, and the evolution of galaxy kinematics from 0.7<z<2.7
• Structure and star formation in galaxies out to z=3: evidence for surface density dependent evolution and upsizing
• Evidence for powerful AGN winds at high redshift: Dynamics of galactic outflows in radio galaxies during the "Quasar Era"
• The role of stellar feedback in the formation of galaxies
• Kinemetry of SINS High-Redshift Star-Forming Galaxies: Distinguishing Rotating Disks from Major Mergers
• Geometry of Star-Forming Galaxies from SDSS, 3D-HST and CANDELS
• The formation and assembly of a typical star-forming galaxy at z~3
• z~2: An Epoch of Disk Assembly
• HST morphologies of local Lyman break galaxy analogs I: Evidence for starbursts triggered by merging
• Keck-I MOSFIRE spectroscopy of compact star-forming galaxies at z$\gtrsim$2: High velocity dispersions in progenitors of compact quiescent galaxies
• Morpheus Reveals Distant Disk Galaxy Morphologies with JWST: The First AI/ML Analysis of JWST Images
• The SINS Survey: Broad Emission Lines in High-Redshift Star-Forming Galaxies
• Distinguishing Mergers and Disks in High Redshift Observations of Galaxy Kinematics
• The VLT SINFONI Mg ii Program for Line Emitters (SIMPLE) II: background quasars probing z $\sim$ 1 galactic winds
• Morpho-kinematics of z~1 galaxies probe the hierarchical scenario
• An OSIRIS study of the gas kinematics in a sample of UV-selected galaxies: Evidence of "Hot and Bothered" starbursts in the local Universe
• The SAMI Galaxy Survey: Gas velocity dispersions in low-$z$ star-forming galaxies and the drivers of turbulence
• The KBSS-KCWI Survey: The connection between extended Ly$\alpha$ halos and galaxy azimuthal angle at $z\sim 2-3$
• First Results from the KMOS Lens-Amplified Spectroscopic Survey (KLASS): Kinematics of Lensed Galaxies at Cosmic Noon
• What drives the velocity dispersion of ionized gas in star-forming galaxies?
• The most ancient spiral galaxy: a 2.6-Gyr-old disk with a tranquil velocity field
• IROCKS: Spatially resolved kinematics of z~1 star forming galaxies
• Structures of Local Galaxies Compared to High Redshift Star-forming Galaxies
• Cosmological simulations of Milky Way-sized galaxies
• Stellar Population Synthesis with Distinct Kinematics: Multi-Age Asymmetric Drift in SDSS-IV MaNGA Galaxies
• Angular momentum of $z\sim 1.5$ galaxies and their local analogues with adaptive optics
• The SAMI Galaxy Survey: Bayesian Inference for Gas Disk Kinematics using a Hierarchical Gaussian Mixture Model
• The major mechanism to drive turbulence in star-forming galaxies
• ISM conditions in z~0.2 Lyman-Break Analogs
• Evolution of gaseous disk viscosity driven by supernova explosion in star-forming galaxies at high redshift
• Coupling MOAO with Integral Field Spectroscopy: specifications for the VLT and the E-ELT
• Multiresolution angular momentum measurements of z~1.5-2 star-forming galaxies
• LGS AO Science Impact: Present and Future Perspectives
• Transforming galaxies with EASE: widespread structural changes enabled by short-lived spirals
• Low-redshift analogues of cosmic noon galaxies as laboratories for clumpy star formation
• The LEGA-C and SAMI Galaxy Surveys: Quiescent Stellar Populations and the Mass-Size Plane across 6 Gyr