EAS Publications Series
Volume 36, 2009Dark Energy and Dark Matter: Observations, Experiments and Theories
|Page(s)||149 - 151|
|Published online||30 May 2009|
E. Pécontal, T. Buchert, Ph. Di Stefano and Y. Copin (eds)
EAS Publications Series, 36 (2009) 149-151
Constraining gravity at large scales with X-ray galaxy cluster studies
KIPAC at Stanford University, 452
Lomita Mall, Stanford CA, 94305-4085, USA, and SLAC National
Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA 94025,
2 Institute for Astronomy, 2680 Woodlawn Drive, Honolulu, HI 96822, USA
3 Astronomisches Rechen-Institut, Zentrum für Astronomie der Universität Heidelberg, Mönchhofstrasse 12-14, 69120 Heidelberg, Germany
4 Institute of Astronomy, Madingley Road, Cambridge CB3 0HA, UK
Using two complementary X-ray galaxy cluster studies we present new cosmological constraints on dark energy. Using Chandra measurements of the X-ray gas mass fraction, fgas, we obtain a detection of the effects of dark energy comparable in significance to recent type Ia supernovae (SNIa) studies. Using X-ray luminosity function (XLF) data from galaxy cluster surveys, we obtain the first interesting determination of the dark energy equation of state from measurements of the growth of cosmic structure in clusters. Both of our experiments provide strong, independent support to the ΛCDM paradigm.
© EAS, EDP Sciences, 2009
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.