A Kinematic Approach To Assessing Environmental Effects: Star-Forming Galaxies in a z~0.9 SpARCS cluster using Spitzer 24um Observations

Abstract

We present an infrared study of a z=0.872 cluster, SpARCS J161314+564930, with the primary aim of distinguishing the dynamical histories of spectroscopically confirmed star-forming members to assess the role of cluster environment. We utilize deep MIPS imaging and a mass-limited sample of 85 spectroscopic members to identify 16 24um-bright sources within the cluster, and measure their 24um star formation rates (SFRs) down to ~6 Msolar/year. Based on their line-of-sight velocities and stellar ages, MIPS cluster members appear to be an infalling population that was recently accreted from the field with minimal environmental dependency on their star formation. However, we identify a double-sequenced distribution of star-forming galaxies amongst the members, with one branch exhibiting declining specific SFRs with mass. The members along this sub-main sequence contain spectral features suggestive of passive galaxies. Using caustic diagrams, we kinematically identify these galaxies as a virialized and/or backsplash population. Moreover, we find a mix of dynamical histories at all projected radii, indicating that standard definitions of environment (i.e., radius and density) are contaminated with recently accreted interlopers, which could contribute to a lack of environmental trends for star-forming galaxies. A cleaner narrative of their dynamical past begins to unfold when using a proxy for accretion histories through profiles of constant (r/r_200)x(Delta v/sigma_v); galaxies accreted at earlier times possess lower values of (r/r_200)x(Delta v/sigma_v) with minimal contamination from the distinct infalling population. Therefore, adopting a time-averaged definition for density (as traced by accretion histories) rather than an instantaneous density yields a depressed specific SFR within the dynamical cluster core.

14 pages, 10 figures, 1 table; accepted for publication in ApJ

References in corpus (15)

• Mass and environment as drivers of galaxy evolution in SDSS and zCOSMOS and the origin of the Schechter function
• Star Formation in AEGIS Field Galaxies since z=1.1 : The Dominance of Gradually Declining Star Formation, and the Main Sequence of Star-Forming Galaxies
• The DEEP2 Galaxy Redshift Survey: The Role of Galaxy Environment in the Cosmic Star-Formation History
• The suppression of star formation by powerful active galactic nuclei
• Evidence for Significant Growth in the Stellar Mass of Brightest Cluster Galaxies over the Past 10 Billion Years
• No clear submillimetre signature of suppressed star formation amongst X-ray luminous AGNs
• The relation between star formation, morphology and local density in high redshift clusters and groups
• Mid-IR Luminosities and UV/Optical Star Formation Rates at z<1.4
• Discovery of a Rich Cluster at z = 1.63 using the Rest-Frame 1.6um "Stellar Bump Sequence" Method
• The Evolution of Active Galactic Nuclei in Clusters of Galaxies to Redshift 1.3
• Spitzer/MIPS 24um Observations of Galaxy Clusters: An Increasing Fraction of Obscured Star-forming Members from z=0.02 to z=0.83
• LoCuSS: A Dynamical Analysis of X-ray AGN in Local Clusters
• The origin of HI-deficiency in galaxies on the outskirts of the Virgo cluster. I. How far can galaxies bounce out of clusters?
• The Evolution of Dusty Star Formation and Stellar Mass Assembly in Clusters: Results from the IRAC 3.6um, 4.5um, 5.8um and 8.0um Cluster Luminosity Functions
• The Munich Near-Infrared Cluster Survey (MUNICS) - IX. Galaxy Evolution to z ~ 2 From Optically Selected Catalogues

Cited by in corpus (44)

• BUDHIES II: A phase-space view of HI gas stripping and star-formation quenching in cluster galaxies
• The Phase Space and Stellar Populations of Cluster Galaxies at z ~ 1: Simultaneous Constraints on the Location and Timescale of Satellite Quenching
• The Ubiquity of Coeval Starbursts in Massive Galaxy Cluster Progenitors
• Evidence for a change in the dominant satellite galaxy quenching mechanism at z=1
• The evolution of dust-obscured star formation activity in galaxy clusters relative to the field over the last 9 billion years
• Stellar mass function of cluster galaxies at z $\sim$ 1.5: evidence for reduced quenching efficiency at high redshift
• Physical properties of SDSS satellite galaxies in projected phase-space
• Evidence for strong evolution in galaxy environmental quenching efficiency between z = 1.6 and z = 0.9
• Molecular gas reservoirs in cluster galaxies at z=1.46
• The SAMI Galaxy Survey: Quenching of star formation in clusters I. Transition galaxies
• Revealing environmental dependence of molecular gas content in a distant X-ray cluster at z=2.51
• Gemini Observations of Galaxies in Rich Early Environments (GOGREEN) I: Survey Description
• Origins of ultra-diffuse galaxies in the Coma cluster - I. Constraints from velocity phase-space
• YZiCS: Unveiling Quenching History of Cluster Galaxies Using Phase-space Analysis
• Chronos and Kairos: Mosfire Observations of Post-Starburst Galaxies in z~1 Clusters and Groups
• The GOGREEN and GCLASS Surveys: First Data Release
• CLASH-VLT: Abell~S1063. Cluster assembly history and spectroscopic catalogue
• The Phase Space of z~1.2 SpARCS Clusters: Using Herschel to probe Dust Temperature as a Function of Environment and Accretion History
• Signs of environmental effects on star-forming galaxies in the Spiderweb protocluster at z=2.16
• Evolutionary phases of gas-rich galaxies in a galaxy cluster at z=1.46
• Peculiar compact stellar systems in the Fornax cluster
• The Properties of Radio Galaxies and the Effect of Environment in Large Scale Structures at $z\sim 1$
• NoSOCS in SDSS. V. Red Disc and Blue Bulge Galaxies Across Different Environments
• Quantifying the role of ram pressure stripping of galaxies within galaxy groups
• Searching for Environmental Effects on Galaxy Kinematics in Groups and Clusters at z~1 from the ORELSE Survey
• Evidence for the Universality of Properties of Red-Sequence Galaxies in X-ray- and Red-Sequence-Selected Clusters at z ~ 1
• Abell 2384: the galaxy population of a cluster post-merger
• X-Ray Emitting Active Galactic Nuclei from z = 0.6-1.3 in the Intermediate and High-Density Environments of the ORELSE Survey
• Spatial and Kinematic Distributions of Transition Populations in Intermediate Redshift Galaxy Clusters
• Possible Evidence of the Radio AGN Quenching of Neighboring Galaxies at z $\sim$ 1
• The Properties of Radio and Mid-infrared Detected Galaxies and the Effect of Environment on the Co-evolution of AGN and Star Formation at $z\sim 1$
• Synthesizing Stellar Populations in South Pole Telescope Galaxy Clusters: I. Ages of Quiescent Member Galaxies at 0.3 < z < 1.4
• The miniJPAS survey: The galaxy populations in the most massive cluster in miniJPAS, mJPC2470-1771
• SITELLE Hα Imaging Spectroscopy of z~0.25 Clusters: Emission Line Galaxy Detection and Ionized Gas Offset in Abell 2390 & Abell 2465
• COALAS III: The ATCA CO(1-0) look at the growth and death of H$\alpha$ emitters in the Spiderweb protocluster at z=2.16
• The evolution of galaxy scaling relations in clusters at 0.5<z<1.5
• Extended radio AGN at z ~ 1 in the ORELSE survey: The confining effect of dense environments
• Environmental impact on star-forming galaxies in a $z\sim 0.9$ cluster during course of galaxy accretion
• Boosting the evolutionary picture of Cl 0024+17 and MS 0451-03: A case study at intermediate-redshift
• Stellar angular momentum of disk galaxies at z = 0.7 in the MAGIC survey I. Impact of the environment
• Bright [CII]158$\mu$m Streamers as a Beacon for Giant Galaxy Formation in SPT2349$-$56 at $z=4.3$
• Star formation activity in a young galaxy cluster at z=0.866
• Estimating infall times of galaxies around clusters: how accurately can it be done with observational data?
• Dissecting the strong lensing galaxy cluster MS 0440$+$0204 II. New optical spectroscopic observations in a wider area and cluster dynamical state