NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-04-26 T09:19:00 PDT
Help | Comment | NED Home

For refcode 1997ApJ...482L..13M:
Retrieve 38 NED objects in this reference.
Please click here for ADS abstract

NED Abstract

Copyright by American Astronomical Society. Reproduced by permission
1997ApJ...482L..13M The Luminosity-Temperature Relation at z = 0.4 for Clusters of Galaxies R. F. MUSHOTZKY AND C. A. SCHARF Laboratory for High Energy Astrophysics, Code 662, NASA/Goddard Space Flight Center, Greenbelt, MD 20771 Received 1997 January 31; accepted 1997 March 13 ABSTRACT We have obtained the first large sample of accurate temperatures for clusters at z > 0.14 from ASCA. We compare the luminosity-temperature (L- T) distribution for these clusters with the low-redshift sample of David and coworkers and find that there is no evidence for evolution. We also find that the intrinsic variance in this relation is roughly constant with redshift. Additionally, there is no detectable change in the relationship of optical velocity dispersion to X-ray temperature with redshift. Most cosmological simulations driven primarily by gravity predict substantial changes in the L-T relation due to the recent rapid growth of clusters. Our results are consistent either with models in which the cluster core entropy is dominated by preheating, or with low- {OMEGA} models in which cluster structure does not evolve strongly with time. The intrinsic variance in the L-T relation at a fixed redshift can be due to variety of possible causes, e.g., a change in the baryonic fraction from cluster to cluster, variation in the fraction of the total energy in the system arising from shocks or supernova heating, or variations in the emission measure distributions in multiphase gas. Subject headings: cosmology: observations-galaxies: clusters: general-X- rays: galaxies
Retrieve 38 NED objects in this reference.
Please click here for ADS abstract

Back to NED Home