The High-Redshift Clusters Occupied by Bent Radio AGN (COBRA) Survey: The \spitzer Catalog

Abstract

We present 190 galaxy cluster candidates (most at high redshift) based on galaxy overdensity measurements in the \spitzer/IRAC imaging of the fields surrounding 646 bent, double-lobed radio sources drawn from the Clusters Occupied by Bent Radio AGN (COBRA) Survey. The COBRA sources were chosen as objects in the VLA FIRST survey that lack optical counterparts in the Sloan Digital Sky Survey (SDSS) to a limit of $m_r=22$, making them likely to lie at high redshift. This is confirmed by our observations: the redshift distribution of COBRA sources with estimated redshifts peaks near $z=1$, and extends out to $z\approx 3$. Cluster candidates were identified by comparing our target fields to a background field and searching for statistically significant ($\ge 2\sigma$) excesses in the galaxy number counts surrounding the radio sources; 190 fields satisfy the $\ge 2\sigma$ limit. We find that 530 fields (82.0\%) have a net positive excess of galaxies surrounding the radio source. Many of the fields with positive excesses but below the $2\sigma$ cutoff are likely to be galaxy groups. Forty-one COBRA sources are quasars with known spectroscopic redshifts, which may be tracers of some of the most distant clusters known.

18 pages, 8 figures, 3 tables, ApJ accepted

References in corpus (20)

• Heating Hot Atmospheres with Active Galactic Nuclei
• Galaxy Clusters Discovered via the Sunyaev-Zel'dovich Effect in the 2500-square-degree SPT-SZ survey
• Distant Radio Galaxies and their Environments
• The origin of cold fronts in the cores of relaxed galaxy clusters
• Protoclusters associated with z > 2 radio galaxies. I. Characteristics of high redshift protoclusters
• Photometric Redshifts in the IRAC Shallow Survey
• Radio Sources in Galaxy Clusters: Radial Distribution, and 1.4 GHz and K-band Bivariate Luminosity Function
• The Angular Clustering of Distant Galaxy Clusters
• Why z > 1 radio-loud galaxies are commonly located in proto-clusters
• The Formation of Massive Cluster Galaxies
• The Galaxy Cluster Mid-Infrared Luminosity Function at 1.3<z<3.2
• 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
• Assembly of the Red Sequence in Infrared-Selected Galaxy Clusters from the IRAC Shallow Cluster Survey
• Galaxy Populations in Massive Galaxy Clusters to z=1.1: Color Distribution, Concentration, Halo Occupation Number and Red Sequence Fraction
• The Massive and Distant Clusters of WISE Survey II: Initial Spectroscopic Confirmation of z ~ 1 Galaxy Clusters Selected from 10,000 Square Degrees
• The Massive and Distant Clusters of WISE Survey. III. Sunyaev-Zel'dovich Masses of Galaxy Clusters at $z\sim 1$
• Comparing Pattern Recognition Feature Sets for Sorting Triples in the FIRST Database
• (No) dimming of X-ray clusters beyond z~1 at fixed mass: crude redhshifts and masses from raw X-ray and SZ data
• Candidate Clusters of Galaxies at $z>1.3$ Identified in the Spitzer SPT Deep Field Survey
• Bent-Tailed Radio Sources in the Australia Telescope Large Area Survey of the Chandra Deep Field-South

Cited by in corpus (26)

• Radio galaxies and feedback from AGN jets
• $HST$ Grism Confirmation of $16$ Structures at $1.4<z<2.8$ from the Clusters Around Radio-Loud AGN (CARLA) Survey
• Radio Galaxy Zoo: The Distortion of Radio Galaxies by Galaxy Clusters
• RELICS: A Strong Lens Model for SPT-CLJ0615-5746, a z=0.972 Cluster
• Giant Metrewave Radio Telescope Observations of Head-Tail Radio Galaxies
• Spectroscopic Confirmation of Five Galaxy Clusters at z > 1.25 in the 2500 sq. deg. SPT-SZ Survey
• A New Catalog of Head Tail Radio Galaxies from the VLA FIRST Survey
• Galaxy populations in the most distant SPT-SZ clusters - I. Environmental quenching in massive clusters at $1.4\lesssim z\lesssim 1.7$
• Molecular gas in radio galaxies in dense Mpc-scale environments at $z=0.4-2.6$
• The Massive and Distant Clusters of WISE Survey VII: The Environments and Properties of Radio Galaxies in Clusters at z~1
• The High-Redshift Clusters Occupied by Bent Radio AGN (COBRA) Survey: Follow-Up Optical Imaging
• Multiwavelength view of SPT-CL J2106-5844. The radio galaxies and the thermal and relativistic plasmas in a massive galaxy cluster merger at z~1.13
• The High-Redshift Clusters Occupied by Bent Radio AGN (COBRA) Survey: Radio Source Properties
• Synthesizing Stellar Populations in South Pole Telescope Galaxy Clusters: I. Ages of Quiescent Member Galaxies at 0.3 < z < 1.4
• The Massive and Distant Clusters of WISE Survey V: Extended Radio Sources in Massive Galaxy Clusters at z~1
• 3C 17: The BCG of a galaxy cluster at z=0.22
• The Massive and Distant Clusters of WISE Survey IX: High Radio Activity in a Merging Cluster
• The Massive and Distant Clusters of WISE Survey. VIII. Radio Activity in Massive Galaxy Clusters
• Identification of 4876 Bent-Tail Radio Galaxies in the FIRST Survey Using Deep Learning Combined with Visual Inspection
• A rare case of FR I interaction with a hot X-ray bridge in the A2384 galaxy cluster
• HST Grism Observations of a z~1.8 Cluster Candidate from the Clusters Occupied by Bent Radio AGN (COBRA) Survey
• The phase-space of tailed radio galaxies in massive clusters
• Powerful yet lonely: Is 3C 297 a high-redshift fossil group?
• Probing the influence of the protocluster environment on galaxy morphology at z = 2.23
• Hosts and environments: a (large-scale) radio history of AGN and star-forming galaxies
• Testing the correlation between bending angle and polarization properties of bent radio galaxies