Environmental impacts on the rest-frame UV size and morphology ofstar-forming galaxies at $z\sim 2$

Abstract

We report the measurement of rest-frame UV size and morphology of H$\alpha$-emission-selected star-forming galaxies (HAEs) in four protoclusters at z $\sim$ 2 (PKS 1138-262, USS 1558-003, PHz G237.0+42.5, and CC 2.2) using archival Hubble Space Telescope Advanced Camera Surveys (HST/ACS) F814W data. We compare the measurement of 122 HAEs in protoclusters detected by HST/ACS to a coeval comparison field sample of 436 HAEs. We find the size distributions of protocluster and field HAEs are similar with typical half-light radius of $\sim$ 2.5 kpc. At fixed stellar mass, there is no significant difference between HAE in protocluster and in field, which is also supported by stacking analyses. This result suggests that the environment does not significantly affect the size of galaxies during the star-forming phase at this epoch. Based on Sérsic index and non-parametric morphologies, HAE morphologies in both environments at $z\sim 2$ in rest-frame UV are consistent with disk-like star-forming galaxies, although we also find $29\%\pm 4\%$ HAEs have peculiar or disturbed morphologies. The fraction of disturbed galaxies is higher in protocluster environment, with $39\pm 8\%$ protocluster HAEs showing disturbed morphologies, compared to $26\pm 4\%$ in the comparison field. The apparent disturbed morphologies are correlated with higher star-formation activity and may be caused by either in situ giant clumps or mergers.

arXiv comment28 pages. Accepted for publication by The Astrophysical Journal

References in corpus (71)

• Astropy: A Community Python Package for Astronomy
• The Astropy Project: Building an inclusive, open-science project and status of the v2.0 core package
• The Astropy Project: Sustaining and Growing a Community-oriented Open-source Project and the Latest Major Release (v5.0) of the Core Package
• 3D-HST+CANDELS: The Evolution of the Galaxy Size-Mass Distribution since $z=3$
• Formation of Massive Galaxies at High Redshift: Cold Streams, Clumpy Disks and Compact Spheroids
• The Relationship Between Stellar Light Distributions of Galaxies and their Formation Histories
• A New Non-Parametric Approach to Galaxy Morphological Classification
• UltraVISTA: a new ultra-deep near-infrared survey in COSMOS
• The COSMOS Survey: Hubble Space Telescope / Advanced Camera for Surveys (HST/ACS) Observations and Data Processing
• Galaxy Structure and Mode of Star Formation in the SFR-Mass Plane from z ~ 2.5 to z ~ 0.1
• The Asymmetry of Galaxies: Physical Morphology for Nearby and High Redshift Galaxies
• The Evolution of Galaxy Structure over Cosmic Time
• Can Minor Merging Account for the Size Growth of Quiescent Galaxies? New Results from the CANDELS Survey
• The optical morphologies of galaxies in the IllustrisTNG simulation: a comparison to Pan-STARRS observations
• Weak Gravitational Lensing with COSMOS: Galaxy Selection and Shape Measurements
• Galaxy Merger Morphologies and Time-Scales from Simulations of Equal-Mass Gas-Rich Disc Mergers
• Structural and Photometric Classification of Galaxies - I. Calibration Based on a Nearby Galaxy Sample
• A large Hα survey at z=2.23, 1.47, 0.84 & 0.40: the 11 Gyr evolution of star-forming galaxies from HiZELS
• Smooth(er) Stellar Mass Maps in CANDELS: Constraints on the Longevity of Clumps in High-redshift Star-forming Galaxies
• The realm of the galaxy protoclusters
• The Effect of Mass Ratio on the Morphology and Time-scales of Disc Galaxy Mergers
• The Structures of Distant Galaxies I: Galaxy Structures and the Merger Rate to z~3 in the Hubble Ultra-Deep Field
• Galaxy Morphology and Star Formation in the Illustris Simulation at z=0
• Spectroscopic Confirmation of the Rich z=1.80 Galaxy Cluster JKCS 041 Using the WFC3 Grism: Environmental Trends in the Ages and Structure of Quiescent Galaxies
• The First Appearance of the Red Sequence of Galaxies in Proto-Clusters at 2<~z<~3
• The Effect of Gas Fraction on the Morphology and Time-scales of Disc Galaxy Mergers
• The zCOSMOS Redshift Survey: the role of environment and stellar mass in shaping the rise of the morphology-density relation from z~1
• A massive, distant proto-cluster at z=2.47 caught in a phase of rapid formation?
• The stellar mass function of star-forming galaxies and the mass-dependent SFR function since z=2.23 from HiZELS
• An excess of dusty starbursts related to the Spiderweb galaxy
• CANDELS Observations of the Structural Properties and Evolution of Galaxies in a Cluster at z=1.62
• The Spiderweb galaxy: a forming massive cluster galaxy at z~2
• Morphologies of ~190,000 Galaxies at z=0-10 Revealed with HST Legacy Data II. Evolution of Clumpy Galaxies
• Do submillimeter galaxies really trace the most massive dark matter halos? Discovery of a high-z cluster in a highly active phase of evolution
• Massive starburst galaxies in a z=2.16 proto-cluster unveiled by panoramic H-alpha mapping
• A star-bursting proto-cluster in making associated to a radio galaxy at z=2.53 discovered by H_alpha imaging
• The clustering of H-alpha emitters at z=2.23 from HiZELS
• Spectroscopic Confirmation of a Protocluster at $z=3.37$ with a High Fraction of Quiescent Galaxies
• Evidence for a correlation between the sizes of quiescent galaxies and local environment to z ~ 2
• MAHALO Deep Cluster Survey I. Accelerated and enhanced galaxy formation in the densest regions of a protocluster at z=2.5
• The Size Evolution of Star-forming Galaxies Since z~7 Using ZFOURGE
• Diverse Structural Evolution at z > 1 in Cosmologically Simulated Galaxies
• MAHALO Deep Cluster Survey II. Characterizing massive forming galaxies in the Spiderweb protocluster at z=2.2
• The effect of the environment on the stellar mass - size relation of present-day galaxies
• Proto-Clusters with Evolved Populations around Radio Galaxies at z~2.5
• HST/WFC3 grism observations of $z\sim 1$ clusters: The cluster vs. field stellar mass-size relation and evidence for size growth of quiescent galaxies from minor mergers
• The merger rates and sizes of galaxies across the peak epoch of star formation from the HiZELS survey
• An enhanced merger fraction within the galaxy population of the SSA22 protocluster at z ~ 3.1
• Early-type galaxies at z~1.3. IV. Scaling relations in different environments
• Beyond Spheroids and Discs: Classifications of CANDELS Galaxy Structure at 1.4 < z < 2 via Principal Component Analysis
• The structural and size evolution of star-forming galaxies over the last 11 Gyrs
• The Environmental Dependence of Galaxy Properties at z=2
• The 700 ks Chandra Spiderweb Field I: evidence for widespread nuclear activity in the Protocluster
• Spectroscopic observations of PHz G237.01+42.50: A galaxy protocluster at z=2.16 in the Cosmos field
• Signs of environmental effects on star-forming galaxies in the Spiderweb protocluster at z=2.16
• The Differential Size Growth of Field and Cluster Galaxies at z=2.1 Using the ZFOURGE Survey
• The Fraction of Active Galactic Nuclei in the USS 1558-003 Protocluster at z = 2.53
• The Morphology-Density relationship in 1<z<2 clusters
• Morphologies of Galaxies in and around a Protocluster at z=2.300
• Enhanced Star Formation of Less Massive Galaxies in a Proto-Cluster at z=2.5
• Spectroscopic Confirmation of a Coma Cluster Progenitor at z ~ 2.2
• A Planck-selected dusty proto-cluster at z=2.16 associated with a strong over-density of massive H$\alpha$ emitting galaxies
• Accelerated galaxy growth and environmental quenching in a protocluster at z=3.24
• HST/WFC3 grism observations of $z\sim 1$ clusters: Evidence for rapid outside-in environmental quenching from spatially resolved H$\alpha$ maps
• CEERS: Spatially Resolved UV and mid-IR Star Formation in Galaxies at 0.2 < z < 2.5: The Picture from the Hubble and James Webb Space Telescopes
• High-resolution ALMA study of CO (2-1) line and dust continuum emissions in cluster galaxies at z = 1.46
• ZFIRE: Similar Stellar Growth in H$\alpha$-emitting Cluster and Field Galaxies at z~2
• The galaxy mass-size relation in CARLA clusters and proto-clusters at 1.4 < z < 2.8: larger cluster galaxy sizes
• Differences in the structural properties and star-formation rates of field and cluster galaxies at z~1
• The cosmic epoch dependence of environmental effects on size evolution of red-sequence early-type galaxies
• Accelerated structural evolution of galaxies in a starbursting cluster at z=2.51

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• JWST reveals extended stellar disks for ALMA-bright dusty star-forming galaxies in the Spiderweb protocluster
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