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The atacama cosmology telescope: cosmology from galaxy clusters detected via the sunyaev-zel'dovich effect
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Chervenak, Jay Sehgal, Neelima Trac, Hy Aguirre, Paula Das, Sudeep Wollack, Ed Duenner, Rolando Fowler, Joseph W. Brown, Ben Dunkley, Joanna Hajian, Amir Barrientos, L. Felipe Burger, Bryce Bond, J. Richard Devlin, Mark J. Fisher, Ryan P. Battistelli, Elia S. Ade, Peter A. R. Acquaviva, Viviana Appel, John W. Halpern, Mark Dicker, Simon R. Doriese, W. Bertrand Amiri, Mandana Essinger-Hileman Sr., Thomas |
| Copyright Year | 2010 |
| Description | We present constraints on cosmological parameters based on a sample of Sunyaev-Zel'dovich-selected galaxy clusters detected in a millimeter-wave survey by the Atacama Cosmology Telescope. The cluster sample used in this analysis consists of 9 optically-confirmed high-mass clusters comprising the high-significance end of the total cluster sample identified in 455 square degrees of sky surveyed during 2008 at 148 GHz. We focus on the most massive systems to reduce the degeneracy between unknown cluster astrophysics and cosmology derived from SZ surveys. We describe the scaling relation between cluster mass and SZ signal with a 4-parameter fit. Marginalizing over the values of the parameters in this fit with conservative priors gives (sigma)8 = 0.851 +/- 0.115 and w = -1.14 +/- 0.35 for a spatially-flat wCDM cosmological model with WMAP 7-year priors on cosmological parameters. This gives a modest improvement in statistical uncertainty over WMAP 7-year constraints alone. Fixing the scaling relation between cluster mass and SZ signal to a fiducial relation obtained from numerical simulations and calibrated by X-ray observations, we find (sigma)8 + 0.821 +/- 0.044 and w = -1.05 +/- 0.20. These results are consistent with constraints from WMAP 7 plus baryon acoustic oscillations plus type Ia supernova which give (sigma)8 = 0.802 +/- 0.038 and w = -0.98 +/- 0.053. A stacking analysis of the clusters in this sample compared to clusters simulated assuming the fiducial model also shows good agreement. These results suggest that, given the sample of clusters used here, both the astrophysics of massive clusters and the cosmological parameters derived from them are broadly consistent with current models. |
| File Size | 1241817 |
| Page Count | 12 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_20120002630 |
| Archival Resource Key | ark:/13960/t6838sk42 |
| Language | English |
| Publisher Date | 2010-10-07 |
| Access Restriction | Open |
| Subject Keyword | Astrophysics Sound Waves Supernovae Calibrating Microwave Anisotropy Probe Oscillations Surveys Galactic Clusters X Rays Astronomical Models Millimeter Waves Telescopes Cosmology Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Article |
