Nick Battaglia

Cosmological parameters from pre-planck cosmic microwave background measurements

Erminia Calabrese, Renée A. Hlozek, Nick Battaglia, Elia S. Battistelli, J. Richard Bond, Jens Chluba, Devin Crichton, Sudeep Das, 8 Mark J. Devlin, Joanna Dunkley, Rolando Dünner, Marzieh Farhang, 11 Megan B. Gralla, Amir Hajian, Mark Halpern, Matthew Hasselfield, 12 Adam D. Hincks, Kent D. Irwin, Arthur Kosowsky, Thibaut Louis, Tobias A. Marriage, 2, 15 Kavilan Moodley, Laura Newburgh, Michael D. Niemack, 13, 17 Michael R. Nolta, Lyman A. Page, Neelima Sehgal, Blake D. Sherwin, Jonathan L. Sievers, Cristóbal Sifón, David N. Spergel, Suzanne T. Staggs, Eric R. Switzer, and Edward J. Wollack Sub-department of Astrophysics, University of Oxford, Keble Road, Oxford OX1 3RH, UK Dept. of Astrophysical Sciences, Peyton Hall, Princeton University, Princeton, NJ 08544, USA Department of Physics, Carnegie Mellon University, Pittsburgh, PA 15213, USA Department of Physics, University of Rome ‘Sapienza’, Piazzale Aldo Moro 5, I-00185 Rome, Italy CITA, University of Toronto, Toronto, ON M5S 3H8, Canada Johns Hopkins University, 3400 N. Charles St., Baltimore, MD 21218-2686, USA High Energy Physics Division, Argonne National Laboratory, 9700 S Cass Avenue, Lemont, IL 60439, USA BCCP, LBL and Department of Physics, University of California, Berkeley, CA 94720, USA Department of Physics and Astronomy, University of Pennsylvania, 209 South 33rd St., Philadelphia,PA 19104,USA Departamento de Astronomı́a y Astrof́ısica, Pontifićıa Universidad Católica de Chile, Casilla 306, Santiago 22, Chile Department of Astronomy and Astrophysics, University of Toronto, 50 St George , Toronto, ON, M5S 3H4 Department of Physics and Astronomy, University of British Columbia, Vancouver, BC V6T 1Z4, Canada NIST Quantum Devices Group, 325 Broadway Mailcode 817.03, Boulder, CO 80305, USA Department of Physics and Astronomy, University of Pittsburgh, Pittsburgh, PA 15260, USA Joseph Henry Laboratories of Physics, Jadwin Hall, Princeton University, Princeton, NJ 08544,USA Astrophysics and Cosmology Research Unit, School of Mathematical Sciences, University of KwaZulu-Natal, Durban, 4041, South Africa Department of Physics, Cornell University, Ithaca, NY, USA 14853 Physics and Astronomy Department, Stony Brook University, Stony Brook, NY 11794-3800, USA Leiden Observatory, Leiden University, PO Box 9513, NL-2300 RA Leiden, Netherlands NASA/Goddard Space Flight Center, Greenbelt, MD 20771, USA

ON THE CLUSTER PHYSICS OF SUNYAEV-ZEL'DOVICH AND X-RAY SURVEYS. III. MEASUREMENT BIASES AND COSMOLOGICAL EVOLUTION OF GAS AND STELLAR MASS FRACTIONS

Gas masses tightly correlate with the virial masses of galaxy clusters, allowing for a precise determination of cosmological parameters by means of X-ray surveys. However, the gas mass fractions (f gas) at the virial radius (R 200) derived from recent Suzaku observations are considerably larger than the cosmic mean, calling into question the accuracy of cosmological parameters. Here, we use a large suite of cosmological hydrodynamical simulations to study measurement biases of f gas. We employ different variants of simulated physics, including radiative gas physics, star formation, and thermal feedback by active galactic nuclei, which we show is able to arrest overcooling and to result in constant stellar mass fractions for redshifts z < 1. Computing the mass profiles in 48 angular cones, we find anisotropic gas and total mass distributions that imply an angular variance of f gas at the level of 30%. This anisotropy originates from the recent formation epoch of clusters and from the strong internal baryon-to-dark-matter density bias. In the most extreme cones, f gas can be biased high by a factor of two at R 200 in massive clusters (M 200 ~ 1015 M ☉), thereby providing an explanation for high f gas measurements by Suzaku. While projection lowers this factor, there are other measurement biases that may (partially) compensate. At R 200, f gas is biased high by 20% when assuming hydrostatic equilibrium masses, i.e., neglecting the kinetic pressure, and by another ~10%-20% due to the presence of density clumping. At larger radii, both measurement biases increase dramatically. While the cluster sample variance of the true f gas decreases to a level of 5% at R 200, the sample variance that includes both measurement biases remains fairly constant at the level of 10%-20%. The constant redshift evolution of f gas within R 500 for massive clusters is encouraging for using gas masses to derive cosmological parameters, provided the measurement biases can be controlled.

THE ATACAMA COSMOLOGY TELESCOPE: LENSING OF CMB TEMPERATURE AND POLARIZATION DERIVED FROM COSMIC INFRARED BACKGROUND CROSS-CORRELATION

We present a measurement of the gravitational lensing of the Cosmic Microwave Background (CMB) temperature and polarization fields obtained by cross-correlating the reconstructed convergence signal from the first season of Atacama Cosmology Telescope Polarimeter data at 146 GHz with Cosmic Infrared Background (CIB) fluctuations measured using the Planck satellite. Using an effective overlap area of 92.7 square degrees, we detect gravitational lensing of the CMB polarization by large-scale structure at a statistical significance of

Exploring the magnetized cosmic web through low-frequency radio emission

4.5\sigma

Precision Epoch of Reionization Studies with Next-Generation CMB Experiments

. Combining both CMB temperature and polarization data gives a lensing detection at

Evidence of Lensing of the Cosmic Microwave Background by Dark Matter Halos

9.1\sigma

Weak-lensing mass calibration of the Atacama Cosmology Telescope equatorial Sunyaev-Zeldovich cluster sample with the Canada-France-Hawaii telescope stripe 82 survey

significance. A B-mode polarization lensing signal is present with a significance of

The Atacama Cosmology Telescope: dynamical masses for 44 SZ-selected galaxy clusters over 755 square degrees

3.2\sigma

On the Cluster Physics of Sunyaev–Zel'dovich and X-Ray Surveys. IV. Characterizing Density and Pressure Clumping due to Infalling Substructures

. We also present the first measurement of CMB lensing–CIB correlation at small scales corresponding to

The Atacama Cosmology Telescope: cosmological parameters from three seasons of data

l\gt 2000