Title of article :
XMM-Newton Observations of Evolution of Cluster XRay Scaling Relations at z = 0.4-0.7
Author/Authors :
Vikhlinin، A. نويسنده , , O.-Kotov، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی 2 سال 2005
Abstract :
We present a spatially resolved analysis of the temperature and gas density profiles of galaxy clusters at z = 0.4-0.7 observed with XMM-Newton. These data are used to derive the total cluster mass within the radius r500 without assuming isothermality and also to measure the average temperature and total X-ray luminosity, excluding the cooling cores. We derive the high-redshift M-T and L-T relations and compare them with the local measurements. The high-redshift L-T relation has low scatter and evolves as L (alpha)(1 + z)1.8+-0.3 for a fixed T, in agreement with several previous Chandra and XMMNewton studies (Vikhlinin et al., Lumb et al., and Maughan et al.). The observed evolution of the M-T relation follows M500 (alpha)E(z)^-(alpha), where we measure (alpha)= 0.88 +- 0.23. This is in agreement with predictions of the self-similar theory, (alpha)= 1.
Keywords :
X-rays , Clusters , general , galaxies , surveys
Journal title :
Astrophysical Journal
Journal title :
Astrophysical Journal