DE3 - Large Scale Structure and Statistics |
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Speaker |
Mackenzie, Ruari |
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Coauthors |
Shanks, Tom |
| Talk Title |
The Southern Integrated Sachs-Wolfe Effect And the CMB Cold Spot |
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Abstract |
In accelerating cosmologies and some modified gravities Large Scale Structure imprints itself upon the CMB via the Integrated Sachs-Wolfe effect, where over-densities produce hot spots and voids cold spots. We present ongoing work to measure the ISW effect in VST ATLAS, a new ~4700 deg^2 optical survey in the southern hemisphere, via the cross correlation of Luminous Red Galaxies with Planck CMB measurements. To date, ISW detections via cross-correlation have had low significance and VST ATLAS offers both increased area but also an independent dataset to test for systematics. The ISW effect has also been suggested to have created the CMB Cold Spot, a ~3 sigma feature on the CMB with a non-gaussian profile which could be the ISW imprint of a compensated void. We seek to test the claim of ~400 Mpc/h supervoid at low redshift aligned with the CMB Cold Spot from Szapudi, I. et al. 2015 using VST ATLAS, HST COS and a planned spectroscopic survey over the Cold Spot core. |
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