A Collaborative National Center for Fusion & Plasma Research
Events
 
June 25, 2014, 4:00pm to 5:30pm
Colloquia

MBG Auditorium

COLLOQUIUM: Small-scale CMB Cosmology: ACT, Planck and Beyond

Dr. Renee Hlozek
Princeton University
Abstract: 

The Atacama Cosmology Telescope (ACT) has mapped the microwave sky to arcminute scales. We present constraints on parameters from the observations at 148 and 217 GHz respectively by ACT from three years of observations. We fit a model of primary cosmological and secondary foreground parameters to the dataset, including contributions from both the thermal and kinetic Sunyaev-Zeldovich effect, Poisson distributed and correlated infrared sources, radio sources and a term modeling the correlation between the thermal SZ effect and the Cosmic Infrared Background.

We will also put these results in context with the recent results from the Planck satellite, and discuss a reanalysis of the Planck data. We find that the 217GHz x 217GHz detector set spectrum used in the Planck analysis is responsible for some of the tension between the Planck parameters and other astronomical measurements. The difference in parameters between our analysis and that of the Planck team is mostly due to our use of cross-spectra from the publicly available survey maps instead of their use of the detector set cross-spectra which include pixels only observed in one of the surveys. We show evidence suggesting residual systematics in the detector set spectra used in the Planck likelihood code, which is substantially reduced for our spectra. We put these results in context of the recent BICEP results.

Colloquium Committee: 

The Princeton Plasma Physics Laboratory 2014-2015 Colloquium Committee is comprised of the following people. Please feel free to contact them by e-mail regarding any possible speakers or topics for future colloquia.

Carol Ann Austin caustin@pppl.gov
Dennis Mueller, Chair mueller@pppl.gov
Elena Belova, ebelova@pppl.gov
Yuhu Zhai, yzhai@pppl.gov

  • Carol Ann Austin 609-243-2484

U.S. Department of Energy
Princeton Plasma Physics Laboratory is a U.S. Department of Energy national laboratory managed by Princeton University.

Website suggestions and feedback

Google+ · Pinterest · Instagram

PPPL is ISO-14001:2004 certified

Princeton University Institutional Compliance Program

© 2014 Princeton Plasma Physics Laboratory. All rights reserved.

Princeton University
Princeton Plasma Physics Laboratory
P.O. Box 451
Princeton, NJ 08543-0451
GPS: 100 Stellarator Road
Princeton, NJ, 08540
(609) 243-2000