Chandra observations of Abell 2199
نویسنده
چکیده
We present results from an analysis of two Chandra observations of the rich, nearby galaxy cluster Abell 2199. We find evidence (having corrected for projection effects) for radial gradients in temperature and metallicity in the X-ray emitting gas: the temperature drops from kT ∼ 4.2 keV at R=200 kpc to 1.6 keV within R=5 kpc of the centre. The metallicity rises from ∼ 0.3 solar at R=200 kpc to ∼ 0.7 solar at R=30 kpc before dropping to 0.3 solar within the central 5 kpc. We find evidence for structure in the surface brightness distribution associated with the central radio source 3C338. No evidence is found for the gas having a large spread in temperature at any particular location despite the cooling time being short (< 10yr) within the central ∼ 15 kpc. Heating and mass cooling rates are calculated for various assumptions about the state of the gas.
منابع مشابه
An Analysis of BeppoSAX LECS Observations of EUV Emission in Clusters of Galaxies
Kaastra et al. (1999) have used the BeppoSAX LECS instrument to search for excess EUV emission in Abell 2199. They claim that the results obtained confirm an independent report of an excess EUV emission in this cluster (Lieu et al. 1999). Using an inflight derived procedure that is better suited to the analysis of extended sources and which avoids uncertainties related to ground-based calibrati...
متن کاملIsothermal shocks in Abell 2199 and 2 A 0335 + 096 ?
We report on a partially circular X-ray surface brightness discontinuity found at about 55 kpc from the centre of Abell 2199 with Chandra X-ray observatory observations. Unlike cold fronts found in other clusters, the feature shows no significant temperature change across it but has an apparent density jump. We therefore identify it as a weak isothermal shock associated with the central AGN and...
متن کامل1 v 1 2 N ov 1 99 9 EUV EMISSION IN ABELL 1795 , ABELL 2199 , AND THE COMA CLUSTER
We report new EUV data on the cluster of galaxies Abell 1795. These data were taken well away from a detector defect which could have compromised earlier results on this cluster. Our new observations confirm the validity of the original data set. However, we find our results are strongly influenced by the variation of the telescope sensitivity over the field of view and upon the details of the ...
متن کاملThe Orbital Structure of Dark Matter Halos with Gas
With the success of the Chandra and XMM missions and the maturation of gravitational lensing techniques, powerful constraints on the orbital structure of cluster dark matter halos are possible. I show that the X-ray emissivity and mass of a galaxy cluster uniquely specify the anisotropy and velocity dispersion profiles of its dark matter halo. I consider hydrostatic as well as cooling flow scen...
متن کاملLow-energy X-ray emission from the Abell 2199 cluster of galaxies
In a recent Letter, Berghöfer & Bowyer rediscussed the analysis of BeppoSAX LECS data of the cluster of galaxies Abell 2199 as presented by Kaastra et al., in particular the detection of a soft X-ray excess. Berghöfer & Bowyer stated that their analysis method is better suited and does not show evidence for a soft X-ray excess. Here we find it necessary to publish a rebuttal, because it can be ...
متن کامل