IROCKS: Spatially resolved kinematics of z~1 star forming galaxies

Abstract

We present results from IROCKS (Intermediate Redshift OSIRIS Chemo-Kinematic Survey) for sixteen z~1 and one z~1.4 star-forming galaxies. All galaxies were observed with OSIRIS with the laser guide star adaptive optics system at Keck Observatory. We use rest-frame nebular Ha emission lines to trace morphologies and kinematics of ionized gas in star-forming galaxies on sub-kiloparsec physical scales. We observe elevated velocity dispersions (sigma > 50 km/s) seen in z > 1.5 galaxies persist at z~1 in the integrated galaxies. Using an inclined disk model and the ratio of v/sigma, we find that 1/3 of the z~1 sample are disk candidates while the other 2/3 of the sample are dominated by merger-like and irregular sources. We find that including extra attenuation towards HII regions derived from stellar population synthesis modeling brings star formation rates (SFR) using Ha and stellar population fit into a better agreement. We explore properties of compact Ha sub-component, or "clump," at z~1 and find that they follow a similar size-luminosity relation as local HII regions but are scaled-up by an order of magnitude with higher luminosities and sizes. Comparing the z~1 clumps to other high-redshift clump studies, we determine that the clump SFR surface density evolves as a function of redshift. This may imply clump formation is directly related to the gas fraction in these systems and support disk fragmentation as their formation mechanism since gas fraction scales with redshift.

arXiv commentAccepted for publication in ApJ (Aug. 2016)

References in corpus (80)

• Stellar population synthesis at the resolution of 2003
• Galactic Stellar and Substellar Initial Mass Function
• Planck 2013 results. XVI. Cosmological parameters
• The Global Schmidt Law in Star Forming Galaxies
• A Simple Model for the Absorption of Starlight by Dust in Galaxies
• UV Star Formation Rates in the Local Universe
• The SINS survey: SINFONI Integral Field Spectroscopy of z ~ 2 Star-forming Galaxies
• 3D-HST WFC3-selected Photometric Catalogs in the Five CANDELS/3D-HST Fields: Photometry, Photometric Redshifts and Stellar Masses
• The Star-formation Mass Sequence out to z=2.5
• A New Non-Parametric Approach to Galaxy Morphological Classification
• The Dust Opacity of Star-Forming Galaxies
• Radiation Pressure Supported Starburst Disks and AGN Fueling
• The Chandra Deep Field-North Survey. XIII. 2 Ms Point-Source Catalogs
• The DEEP2 Galaxy Redshift Survey: Design, Observations, Data Reduction, and Redshifts
• The SINS survey of z~2 galaxy kinematics: properties of the giant star forming clumps
• Gusty, gaseous flows of FIRE: galactic winds in cosmological simulations with explicit stellar feedback
• Combined CO & Dust Scaling Relations of Depletion Time and Molecular Gas Fractions with Cosmic Time, Specific Star Formation Rate and Stellar Mass
• Forming Disk Galaxies in Lambda CDM Simulations
• The KMOS^3D Survey: design, first results, and the evolution of galaxy kinematics from 0.7<z<2.7
• Star Formation in NGC 5194 (M51a). II. The Spatially-Resolved Star Formation Law
• The Stellar, Gas and Dynamical Masses of Star-Forming Galaxies at z~2
• Towards a complete accounting of energy and momentum from stellar feedback in galaxy formation simulations
• SINFONI Integral Field Spectroscopy of z~2 UV-selected Galaxies: Rotation Curves and Dynamical Evolution
• The Disruption of Giant Molecular Clouds by Radiation Pressure and the Efficiency of Star Formation in Galaxies
• A New Approach to Galaxy Morphology: I. Analysis of the Sloan Digital Sky Survey Early Data Release
• H-alpha Observations of a Large Sample of Galaxies at z~2: Implications for Star Formation in High Redshift Galaxies
• Smooth(er) Stellar Mass Maps in CANDELS: Constraints on the Longevity of Clumps in High-redshift Star-forming Galaxies
• The Kiloparsec-Scale Kinematics of High-Redshift Star-Forming Galaxies
• Resolved Galaxies in the Hubble Ultra Deep Field: Star Formation in Disks at High Redshift
• The Great Observatories Origins Deep Survey. VLT/FORS2 Spectroscopy in the GOODS-South Field: Part III
• Bulge Growth and Quenching since z = 2.5 in CANDELS/3D-HST
• CANDELS Multiwavelength catalogs: Source Identification and Photometry in the CANDELS UKIDSS Ultra-Deep Survey Field
• Turbulent Structure of a Stratified Supernova-Driven Interstellar Medium
• The Team Keck Treasury Redshift Survey of the GOODS-North Field
• Constraints on the assembly and dynamics of galaxies. II. Properties of kiloparsec-scale clumps in rest-frame optical emission of z ~ 2 star-forming galaxies
• Clumpy Galaxies in CANDELS. I. The Definition of UV Clumps and the Fraction of Clumpy Galaxies at 0.5<z<3
• The Epoch of Disk Settling: z~1 to Now
• The SINS/zC-SINF survey of z~2 galaxy kinematics: Outflow properties
• The FMOS-COSMOS survey of star-forming galaxies at z ~ 1.6. I. Hα-based star formation rates and dust extinction
• A method to remove residual OH emission from near infrared spectra
• A New Diagnostic of Active Galactic Nuclei: Revealing Highly-Absorbed Systems at Redshift>0.3
• The KMOS Redshift One Spectroscopic Survey (KROSS): Dynamical properties, gas and dark matter fractions of typical z~1 star-forming galaxies
• Faintest Galaxy Morphologies from $HST$ WFPC2 Imaging of the Hawaii Survey Fields
• GOODS-HERSCHEL: star formation, dust attenuation and the FIR-radio correlation on the Main Sequence of star-forming galaxies up to z~4
• Clumpy Galaxies in GOODS and GEMS: Massive Analogs of Local Dwarf Irregulars
• A Census of Optical and Near-Infrared Selected Star-Forming and Passively Evolving Galaxies at Redshift Z~2
• A Survey of Galaxy Kinematics to z ~ 1 in the TKRS/GOODS-N Field. I. Rotation and Dispersion Properties
• Resolved Spectroscopy of Gravitationally-Lensed Galaxies: Recovering Coherent Velocity Fields in Sub-Luminous z~2-3 Galaxies
• Multi-Wavelength View of Kiloparsec-Scale Clumps in Star-Forming Galaxies at z~2
• Constraints on the Assembly and Dynamics of Galaxies: I. Detailed Rest-frame Optical Morphologies on Kiloparsec-scale of z ~ 2 Star-forming Galaxies
• MASSIV: Mass Assembly Survey with SINFONI in VVDS - II. Kinematics and close environment classification
• Resolved spectroscopy of gravitationally lensed galaxies: global dynamics and star-forming clumps on ~100pc scales
• The growth of dark matter halos: evidence for significant smooth accretion
• Stellar Feedback & Bulge Formation in Clumpy Disks
• The Physical Nature of Rest-UV Galaxy Morphology During the Peak Epoch of Galaxy Formation
• Mid-IR Luminosities and UV/Optical Star Formation Rates at z<1.4
• Optical-to-virial velocity ratios of local disk galaxies from combined kinematics and galaxy-galaxy lensing
• The Dawes Review 1: Kinematic studies of star-forming galaxies across cosmic time
• Integral Field Spectroscopy of High-Redshift Star Forming Galaxies with Laser Guided Adaptive Optics: Evidence for Dispersion-Dominated Kinematics
• The Great Observatories Origins Deep Survey - VLT/ISAAC Near-Infrared Imaging of the GOODS-South Field
• MASSIV: Mass Assembly Survey with SINFONI in VVDS. III. Evidence for positive metallicity gradients in z~1.2 star-forming galaxies
• Dynamics of Galactic Disks and Mergers at z~1.6: Spatially Resolved Spectroscopy with Keck Laser Guide Star Adaptive Optics
• The SINS/zC-SINF Survey of z~2 Galaxy Kinematics: The Nature of Dispersion Dominated Galaxies
• Hubble Space Telescope H-alpha imaging of star-forming galaxies at z = 1-1.5: evolution in the size and luminosity of giant HII regions
• A Survey of Galaxy Kinematics to z ~ 1 in the TKRS/GOODS-N Field. II. Evolution in the Tully-Fisher Relation
• Spatially resolved Halpha maps and sizes of 57 strongly star-forming galaxies at z~1 from 3D-HST: evidence for rapid inside-out assembly of disk galaxies
• Scaling Relations of Star-Forming Regions: from kpc-size clumps to HII regions
• The WiggleZ Dark Energy Survey: High Resolution Kinematics of Luminous Star-Forming Galaxies
• The Gemini Deep Deep Survey: VIII. When Did Early-type Galaxies Form?
• The kinematics of ionized gas in Lyman-Break Analogs at z ~ 0.2
• Nebular Excitation in z~2 Star-forming Galaxies from the SINS and LUCI Surveys: The Influence of Shocks and AGN
• Bulge growth through disk instabilities in high-redshift galaxies
• A Comparative Study of AGN Feedback Algorithms
• The Radial Distribution of Star Formation in Galaxies at z~1 from the 3D-HST Survey
• The [OII]/Halpha ratio of emission line galaxies in the 2dF redshift survey
• Kinematic classifications of local interacting galaxies: implications for the merger/disk classifications at high-z
• Efficiency Measurements and Installation of a New Grating for the OSIRIS Spectrograph at Keck Observatory
• Extended Photometry for the DEEP2 Galaxy Redshift Survey: A Testbed for Photometric Redshift Experiments
• Kinematic Evolution of Simulated Star-Forming Galaxies
• Calibrating the Star Formation Rate at z=1 from Optical Data

Cited by in corpus (28)

• The Dust Attenuation Law in Galaxies
• Star-Forming Galaxies at Cosmic Noon
• The SINS/zC-SINF survey of z~2 galaxy kinematics: SINFONI adaptive optics-assisted data and kiloparsec-scale emission line properties
• z~2: An Epoch of Disk Assembly
• Clumpy Galaxies in CANDELS. II. Physical Properties of UV-bright Clumps at $0.5\le z<3$
• A contribution of star-forming clumps and accreting satellites to the mass assembly of z ~ 2 galaxies
• Inside Out and Upside-Down: The Roles of Gas Cooling and Dynamical Heating in Shaping the Stellar Age-Velocity Relation
• Distinguishing Mergers and Disks in High Redshift Observations of Galaxy Kinematics
• Velocity dispersion in the interstellar medium of early galaxies
• Stellar Masses of Giant Clumps in CANDELS and Simulated Galaxies Using Machine Learning
• Dynamically cold disks in the early Universe: myth or reality?
• What drives the evolution of gas kinematics in star-forming galaxies?
• Star-forming Clumps in Local Luminous Infrared Galaxies
• From giant clumps to clouds -- II. The emergence of thick disc kinematics from the conditions of star formation in high redshift gas rich galaxies
• Fraction of Clumpy Star-Forming Galaxies at $0.5\le z\le 3$ in UVCANDELS: Dependence on Stellar Mass and Environment
• Multiply lensed star forming clumps in the A521-sys1 galaxy at redshift 1
• Origin of Giant Stellar Clumps in High-Redshift Galaxies
• The connection between the peaks in velocity dispersion and star-forming clumps of turbulent galaxies
• Feedback and feeding in the context of galaxy evolution with SPICA: direct characterization of molecular outflows and inflows
• Near-IR clumps and their properties in high-z galaxies with JWST/NIRCam
• Size-Luminosity Scaling Relations of Local and Distant Star Forming Regions
• Finite Resolution Deconvolution of Multi-Wavelength Imaging of 20,000 Galaxies in the COSMOS Field: The Evolution of Clumpy Galaxies Over Cosmic Time
• Stellar feedback in a clumpy galaxy at $z\sim$ 3.4
• UV-Bright Star-Forming Clumps and Their Host Galaxies in UVCANDELS at 0.5 $\le$ z $\le$ 1
• Unveiling the gravitationally unstable disc of a massive star-forming galaxy using NOEMA and MUSE
• A Shallow Slope for the Stellar Mass--Angular Momentum Relation of Star-Forming Galaxies at $1.5<z<2.5$
• Infrared Galaxies in the Field of the Massive Cluster Abell S1063: Discovery of a Luminous Kiloparsec-Sized HII Region in a Gravitationally Lensed IR-Luminous Galaxy at $z=0.6$
• Kinematics and Feedback in H II regions in the Dwarf Starburst Galaxy IC 10