Self Calibration in Cluster Studies of Dark Energy: Combining the Cluster Redshift Distribution, the Power Spectrum and Mass Measurements
| dc.creator | Majumdar, Subhabrata | |
| dc.creator | Mohr, Joseph J. | |
| dc.date | 2003-05-19 | |
| dc.date.accessioned | 2026-07-07T10:26:57Z | |
| dc.date.available | 2026-07-07T10:26:57Z | |
| dc.description | We examine the prospects for measuring the dark energy equation of state parameter w within the context of any uncertain redshift evolution of galaxy cluster structure (building on Majumdar and Mohr, 2003) and show that including the redshift averaged cluster power spectrum, P_cl(k), and direct mass measurements of 100 clusters helps tremendously in reducing cosmological parameter uncertainties. Specifically, we show that when combining the redshift distribution and the power spectrum information for a particular X-ray survey (DUET) and two SZE surveys (SPT & Planck), the constraints on the dark energy equation of state w can be improved by roughly a factor of 4. Because surveys designed to study the redshift distribution of clusters will have all the information necessary to construct P_cl(k), the benefit of adding P_cl(k) in reducing uncertainties comes at no additional observational cost. Combining detailed mass studies of 100 clusters with the redshift distribution improves the parameter uncertainties by a factor of 3-5. The data required for these detailed mass measurements-- assumed to have 1sigma uncertainties of 30-- are accumulating in the the XMM-Newton and Chandra archives. The best constraints are obtained when one combines both the power spectrum constraints and mass measurements with the cluster redshift distribution; when using the survey to extract the parameters and evolution of the mass--observable relations, we estimate the uncertainties on w of ~4% to 6%. These parameter constraints are obtained from self-calibrating cluster surveys alone. In combination with CMB or distance measurements that have different parameter degeneracies, cluster studies of dark energy will provide enhanced constraints and allow for cross--checks of systematics. | |
| dc.description | 9 pages, 4 figures, submitted to ApJ | |
| dc.identifier | https://arxiv.org/abs/astro-ph/0305341 | |
| dc.identifier | http://arxiv.org/abs/astro-ph/0305341 | |
| dc.identifier | Astrophys.J.613:41-50,2004 | |
| dc.identifier | doi:10.1086/422829 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/177015 | |
| dc.subject | Astrophysics | |
| dc.title | Self Calibration in Cluster Studies of Dark Energy: Combining the Cluster Redshift Distribution, the Power Spectrum and Mass Measurements | |
| dc.type | text |