Stellar Masses of Clumps in Gas-rich, Turbulent Disk Galaxies

Abstract

In this paper we use HST/WFC3 observations of 6 galaxies from the DYNAMO survey, combined with stellar population modelling of the SED, to determine the stellar masses of DYNAMO clumps. The DYNAMO sample has been shown to have properties similar to $z\approx 1.5$ turbulent, clumpy disks. DYNAMO sample clump masses offer a useful comparison for studies of $z>1$ in that the galaxies have the same properties, yet the observational biases are significantly different. Using DYNAMO we can more easily probe rest-frame near-IR wavelengths and also probe finer spatial scales. We find that the stellar mass of DYNAMO clumps is typically $10^7-10^8{\mathrm{M}}_{\odot }$. We employ a technique that makes non-parametric corrections in removal of light from nearby clumps, and carries out a locally determined disk subtraction. The process of disk subtraction is the dominant effect, and can alter clump masses at the 0.3~dex level. Using these masses, we investigate the stellar mass function of clumps in DYNAMO galaxies. DYNAMO stellar mass functions follow a declining power law with slope $\alpha \approx -1.4$, which is slightly shallower than, but similar to what is observed in $z>1$ lensed galaxies. We compare DYNAMO clump masses to results of simulations. The masses and galactocentric position of clumps in DYNAMO galaxies are more similar to long-lived clumps in simulations. Similar to recent DYNAMO results on the stellar population gradients, these results are consistent with simulations that do not employ strong "early" radiative feedback prescriptions.

arXiv comment22 pages, 15 figures, accepted by MNRAS

References in corpus (74)

• Stellar population synthesis at the resolution of 2003
• Galactic Stellar and Substellar Initial Mass Function
• The Dust Content and Opacity of Actively Star-Forming Galaxies
• Cosmic Star Formation History
• Stellar mass-to-light ratios and the Tully-Fisher relation
• [O III]/[N II] as an Abundance Indicator at High Redshift
• On the normalisation of the cosmic star formation history
• CIGALE: a python Code Investigating GALaxy Emission
• The Fourth Data Release of the Sloan Digital Sky Survey
• The SINS survey: SINFONI Integral Field Spectroscopy of z ~ 2 Star-forming Galaxies
• Formation of Massive Galaxies at High Redshift: Cold Streams, Clumpy Disks and Compact Spheroids
• PHIBSS: molecular gas content and scaling relations in z~1-3 normal star forming galaxies
• The SINS survey of z~2 galaxy kinematics: properties of the giant star forming clumps
• Galaxy And Mass Assembly: Stellar Mass Estimates
• PHIBSS: Unified Scaling Relations of Gas Depletion Time and Molecular Gas Fractions
• Resolved stellar mass maps of galaxies. I: method and implications for global mass estimates
• Galaxy morphology to I=25 mag in the Hubble Deep Field
• A Direct Measurement of Major Galaxy Mergers at z < 3
• The rapid formation a large rotating disk galaxy three billion years after the Big Bang
• Rapid formation of exponential disks and bulges at high redshift from the dynamical evolution of clump cluster and chain galaxies
• Early Evolution of Disk Galaxies : Formation of Bulges in Clumpy Young Galactic Disks
• The Gemini Deep Deep Survey: III. The abundance of massive galaxies 3-6 billion years after the Big Bang
• Bulge Formation by the Coalescence of Giant Clumps in Primordial Disk Galaxies
• High-redshift clumpy discs and bulges in cosmological simulations
• CO excitation of normal star forming galaxies out to z=1.5 as regulated by the properties of their interstellar medium
• 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
• Kinemetry of SINS High-Redshift Star-Forming Galaxies: Distinguishing Rotating Disks from Major Mergers
• Stellar Populations in Ten Clump-Cluster Galaxies of the Ultra Deep Field
• The impact of interactions, bars, bulges, and AGN on star formation efficiency in local massive galaxies
• A CANDELS - 3D-HST Synergy: Resolved Star Formation Patterns at 0.7 < z < 1.5
• Clumpy Galaxies in CANDELS. I. The Definition of UV Clumps and the Fraction of Clumpy Galaxies at 0.5<z<3
• Faintest Galaxy Morphologies from $HST$ WFPC2 Imaging of the Hawaii Survey Fields
• The long lives of giant clumps and the birth of outflows in gas-rich galaxies at high redshift
• GOODS-Herschel:dust attenuation properties of UV selected high redshift galaxies
• 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
• The Population of Giant Clumps in Simulated High-z Galaxies: In-situ and Ex-situ, Migration and Survival
• Resolved spectroscopy of gravitationally lensed galaxies: global dynamics and star-forming clumps on ~100pc scales
• Stellar Feedback & Bulge Formation in Clumpy Disks
• Giant Clumps in Simulated High-z Galaxies: Properties, Evolution and Dependence on Feedback
• DYNAMO I: A Sample of Ha-Luminous Galaxies with Resolved Kinematics
• Giant clumps in the FIRE simulations: a case study of a massive high-redshift galaxy
• 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
• Scaling Relations of Star-Forming Regions: from kpc-size clumps to HII regions
• The nature of giant clumps in distant galaxies probed by the anatomy of the Cosmic Snake
• Clumpy Galaxies in CANDELS. II. Physical Properties of UV-bright Clumps at $0.5\le z<3$
• Characterizing the UV-to-NIR shape of the dust attenuation curve of IR luminous galaxies up to z$\sim$2
• Steady Outflows in Giant Clumps of High-z Disk Galaxies During Migration and Growth by Accretion
• Kiloparsec Scale Properties of Star-Formation Driven Outflows at z~2.3 in the SINS/zC-SINF AO Survey
• HIGHz: A Survey of the Most HI-Massive Galaxies at z~0.2
• NIHAO XIII: Clumpy discs or clumpy light in high redshift galaxies?
• On the stellar masses of giant clumps in distant star-forming galaxies
• Systematic difference between ionized and molecular gas velocity dispersion in $z\sim 1-2$ disks and local analogues
• Clusters of Small Clumps Can Explain The Peculiar Properties of Giant Clumps in High-Redshift Galaxies
• Connecting Clump Sizes in Turbulent Disk Galaxies to Instability Theory
• High resolution study of the cluster complexes in a lensed spiral at redshift ~1.5; constraints on the bulge formation and disk evolution
• Stellar Masses of Giant Clumps in CANDELS and Simulated Galaxies Using Machine Learning
• Clumpy galaxies seen in H-alpha: inflated observed clump properties due to limited spatial resolution and sensitivity
• Extreme gas fractions in clumpy, turbulent disk galaxies at z~0.1
• First constraints on the stellar mass function of star-forming clumps at the peak of cosmic star formation
• DYNAMO II: Coupled Stellar and Ionized Gas Kinematics in Two Low Redshift Clumpy Disks
• Testing Feedback Regulated Star Formation in Gas Rich, Turbulent Disk Galaxies
• Low Angular Momentum in Clumpy, Turbulent Disk Galaxies
• Star-forming clumps in the Lyman Alpha Reference Sample of galaxies -- I. Photometric analysis and clumpiness
• Spiral-arm instability: giant clump formation via fragmentation of a galactic spiral arm
• Clumpy high-z galaxies as a testbed for feedback-regulated galaxy formation
• Eddington's Demon: Inferring Galaxy Mass Functions and other Distributions from Uncertain Data
• ALMA shows that gas reservoirs of star-forming disks over the past 3 billion years are not predominantly molecular
• The connection between the peaks in velocity dispersion and star-forming clumps of turbulent galaxies
• Gas Content and Kinematics in Clumpy, Turbulent Star-forming Disks
• Dust Attenuation in Clumpy, Star-Forming Galaxies at 0.07 < z < 0.14
• Size-Luminosity Scaling Relations of Local and Distant Star Forming Regions
• Giant Star Forming Complexes in High-z Main Sequence Galaxy Analogues: The Internal Structure of Clumps in DYNAMO Galaxies
• Multiresolution angular momentum measurements of z~1.5-2 star-forming galaxies

Cited by in corpus (6)

• Fraction of Clumpy Star-Forming Galaxies at $0.5\le z\le 3$ in UVCANDELS: Dependence on Stellar Mass and Environment
• The imprint of clump formation at high redshift. II. The chemistry of the bulge
• DUVET: Spatially Resolved Observations of Star Formation Regulation via Galactic Outflows in a Starbursting Disk Galaxy
• UV-Bright Star-Forming Clumps and Their Host Galaxies in UVCANDELS at 0.5 $\le$ z $\le$ 1
• CO Excitation in High-z Main Sequence Analogues: Resolved CO(4-3)/CO(3-2) Line Ratios in DYNAMO Galaxies
• A Shallow Slope for the Stellar Mass--Angular Momentum Relation of Star-Forming Galaxies at $1.5<z<2.5$