Differences in the structural properties and star-formation rates of field and cluster galaxies at z~1

Abstract

We investigate the dependance of galaxy sizes and star-formation rates (SFRs) on environment using a mass-limited sample of quiescent and star-forming galaxies with M>10^9.5 at z=0.92 selected from the NMBS survey. Using the GEEC2 spectroscopic cluster catalog and the accurate photometric redshifts from NMBS, we select quiescent and star-forming cluster (sigma=490 km/s) galaxies within two virial radius, Rvir, intervals of 0.5<Rvir<2 and Rvir<0.5. Galaxies residing outside of 2 Rvir of both the cluster centres and additional candidate over-densities are defined as our field sample. Galaxy structural parameters are measured from the COSMOS legacy HST/ACS F814W image. The sizes and Sersic indices of quiescent field and cluster galaxies have the same distribution regardless of Rvir. However, cluster star-forming galaxies within 0.5 Rvir have lower mass-normalised average sizes, by 16$\pm 7\%$, and a higher fraction of Sersic indices with n>1, than field star-forming galaxies. The average SFRs of star-forming cluster galaxies show a trend of decreasing SFR with clustocentric radius. The mass-normalised average SFR of cluster star-forming galaxies is a factor of 2-2.5 (7-9 sigma) lower than that of star-forming galaxies in the field. While we find no significant dependence on environment for quiescent galaxies, the properties of star-forming galaxies are affected, which could be the result of environment acting on their gas content.

13 pages, 10 figures, accepted by Apj

References in corpus (17)

• Mass and environment as drivers of galaxy evolution in SDSS and zCOSMOS and the origin of the Schechter function
• EAZY: A Fast, Public Photometric Redshift Code
• 3D-HST+CANDELS: The Evolution of the Galaxy Size-Mass Distribution since $z=3$
• An ultra-deep near-infrared spectrum of a compact quiescent galaxy at z=2.2
• zCOSMOS: A Large VLT/VIMOS redshift survey covering 0 < z < 3 in the COSMOS field
• 3D-HST WFC3-selected Photometric Catalogs in the Five CANDELS/3D-HST Fields: Photometry, Photometric Redshifts and Stellar Masses
• Detection of quiescent galaxies in a bicolor sequence from z=0-2
• The DEEP2 Galaxy Redshift Survey: The Role of Galaxy Environment in the Cosmic Star-Formation History
• The Galaxy Content of SDSS Clusters and Groups
• The dramatic size evolution of elliptical galaxies and the quasar feedback
• The sizes of massive quiescent and star forming galaxies at z~4 with ZFOURGE and CANDELS
• VIMOS Ultra-Deep Survey (VUDS): Witnessing the Assembly of a Massive Cluster at z~3.3
• The effect of the environment on the stellar mass - size relation of present-day galaxies
• The GEEC2 spectroscopic survey of Galaxy Groups at $0.8<z<1$
• Star-forming blue ETGs in two newly discovered galaxy overdensities in the HUDF at z=1.84 and 1.9: unveiling the progenitors of passive ETGs in cluster cores
• The Differential Size Growth of Field and Cluster Galaxies at z=2.1 Using the ZFOURGE Survey
• Galaxy sizes as a function of environment at intermediate redshift from the ESO Distant Cluster Survey

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• The effect of environment on star formation activity and morphology at 0.5 < z < 2.5 in CANDELS
• Environmental impacts on the rest-frame UV size and morphology ofstar-forming galaxies at $z\sim 2$
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• Cosmic Stillness: High Quiescent Galaxy Fractions Across Upper Mass Scales in the Early Universe to z = 7 with JWST
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• Evolved galaxies in high-density environments across $2.0\le z<4.2$ using the ZFOURGE survey
• GLACE survey: galaxy activity in ZwCl0024+1652 cluster from strong optical emission lines
• GLACE survey: OSIRIS/GTC tuneable imaging of the galaxy cluster ZwCl 0024.0+1652 II. The mass--metallicity relationship and the effect of the environment