Sunyaev - Zeldovich effect measured towards Abell cluster A 2218
نویسنده
چکیده
We report a new measurement of the cosmological Sunyaev-Zeldovich (SZ) diminution of ∆T ' −(750 ± 200) μK at 10.55 GHz with the Effelsberg 100-m radio telescope towards the A 2218 cluster of galaxies. We also report and analyse the X-ray observations of the A 2218 cluster of galaxies with the ROSAT satellite. The position and the strength of the measured SZ diminution are in excellent agreement with the expectations calculated from the X-ray analysis.
منابع مشابه
A Measurement of H0 from the Sunyaev-zeldovich Effect
We present a determination of the Hubble constant, H0, from measurements of the Sunyaev-Zeldovich effect in an orientation-unbiased sample of seven galaxy clusters. With improved X-ray models and a more z ! 0.1 accurate 32 GHz calibration, we obtain km s 1 Mpc 1 for a standard cold dark matter (CDM) 14 H p 64 14 0 11 sys cosmology, or km s 1 Mpc 1 for a flat LCDM cosmology. In combination with ...
متن کاملTriple Experiment Spectrum of the Sunyaev - Zeldovich Effect in the Coma Cluster : H 0
The Sunyaev-Zeldovich (SZ) effect was previously measured in the Coma cluster by the OVRO and MITO experiments, and recently also with the WMAP satellite. We assess the consistency of these results and their implications on the feasibility of high frequency SZ work with ground-based telescopes. The unique dataset from the combined measurements at six frequency bands is jointly analyzed to deter...
متن کاملar X iv : a st ro - p h / 02 08 02 7 v 1 1 A ug 2 00 2 July 31 , 2002 - in preparation COSMIC MICROWAVE BACKGROUND TEMPERATURE AT GALAXY CLUSTERS
We have deduced the cosmic microwave background (CMB) temperature in the Coma cluster (Abell 1656, z = 0.0231), and in Abell 2163 (z = 0.203) from spectral measurements of the Sunyaev-Zel’dovich (SZ) effect over four passbands at radio and microwave frequencies. The resulting temperatures at these redshifts are TComa = 2.750 +0.043 −0.032 K and TA2163 = 3.335 +0.065 −0.066 K, respectively. Thes...
متن کاملThe mass and dynamical state of Abell 2218
Abell 2218 is one of a handful of clusters in which X-ray and lensing analyses of the cluster mass are in strong disagreement. It is also a system for which X-ray data and radio measurements of the Sunyaev-Zel'dovich decrement have been combined in an attempt to constrain the Hubble constant. However, in the absence of reliable information on the temperature structure of the intracluster gas, m...
متن کاملThe kinematic Sunyaev Zeldovich effect and transverse cluster velocities
The polarization of the CMBR scattered by galaxy clusters in the kinematic Sunyaev Zeldovich effect depends on the transverse velocity of the cluster. This polarizing effect is proportional to the transverse velocity squared, and so weaker that the change in intensity due to the radial motion in the kinematic effect. The value given by Sunyaev and Zeldovich, and which is frequently cited, under...
متن کامل