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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)
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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
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Overdensity of Radio Sources
Cl 1604 Supercluster at z = 0.9
563 radio sources detected143 with measured redshifts44 confirmed members
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Distribution of Radio Power in Five Structures at z = 0.7 – 1.0
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Evolution in the Radio Luminosity
Luminosity evolution generally consistent with (1+z)3, consistent with other active galaxy populations
Best et al. 2002
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Spatial Distribution of Radio Members
X-ray-Selected Cluster at z = 0.82 Group-Group Merger at z = 0.84
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Spatial Distribution of Radio Members
Evolution in the Supercluster Environment between z = 0.9 and 0.7?
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Colors of Radio Members
Evolution in the Supercluster Environment between z = 0.9 and 0.7?
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Colors of Radio Members
Evolution in the Supercluster Environment between z = 0.9 and 0.7?
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Radio Galaxy Morphologies
High Radio PowerBulge dominated, largely early-type galaxies
Low Radio PowerMix of morphologies
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“Quasar-Mode” versus “Radio-Mode”
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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