ORELSE in the Radio : AGN and Starbursts in High-Redshift Structures

The Observations of Redshift Evolution in Large Scale Environments Survey

Lori Lubin (UCD)Chris Fassnacht (UCD) and Neal Miller (UMD)

The ORELSE Survey Strategy

COSMOS AEGISORELSE

Search for LSS around 20 X-ray and optically selected clusters at 0.6 < z < 1.3 using deep, wide-field (30´) imaging in r´, i´, z´, J, K with:

LFC & WIRC - Palomar 5mSuprime-Cam - Subaru 8m WFCAM - UKIRT 4m

High-resolution, multi-object spectroscopy with DEIMOS

Multi-wavelength follow-up observations to study active galaxy population:

Optical - HSTX-ray - ChandraRadio – VLAMIR – Spitzer Lubin et al. 2009

Overdensity of Radio Sources

Cl 1604 Supercluster at z = 0.9

563 radio sources detected143 with measured redshifts44 confirmed members

Distribution of Radio Power in Five Structures at z = 0.7 – 1.0

Evolution in the Radio Luminosity

Luminosity evolution generally consistent with (1+z)3, consistent with other active galaxy populations

Best et al. 2002

Spatial Distribution of Radio Members

X-ray-Selected Cluster at z = 0.82 Group-Group Merger at z = 0.84

Spatial Distribution of Radio Members

Evolution in the Supercluster Environment between z = 0.9 and 0.7?

Colors of Radio Members

Evolution in the Supercluster Environment between z = 0.9 and 0.7?

Colors of Radio Members

Evolution in the Supercluster Environment between z = 0.9 and 0.7?

Radio Galaxy Morphologies

High Radio PowerBulge dominated, largely early-type galaxies

Low Radio PowerMix of morphologies

“Quasar-Mode” versus “Radio-Mode”

ORELSE in the Radio Goals

• Evolution of cluster radio population from z = 0 to 1

• Dependence of radio active fraction and radio luminosity function on global cluster properties and environment

• Comparison between SFRs measured from radio power and other techniques ([OII], mid-IR)

• Evolutionary sequence connecting X-ray and radio AGN

• Evolution in BCG properties

• Effect of AGN on cluster ICM