AAS 196th Meeting, June 2000
Session 51. Galaxy Evolution and Populations/Clusters
Display, Thursday, June 8, 2000, 9:20am-4:00pm, Empire Hall South

[Previous] | [Session 51] | [Next]

[51.07] Spatially Derived Limits on Non-thermal Emission From the Abell 2199 Galaxy Cluster

M.C. Ronquest (University of Maryland, Baltimore County Department of Physics), M. J. Henriksen (UMBC Department of Physics and NASA/GSFC Laboratory for High Energy Astrophysics)

Using a 41,000 second ROSAT PSPC image of the A2199 cluster of galaxies, we have completed a spatial search for emission in excess of the thermal component. The radial surface brightness profile is well fit by the standard "Beta Model" profile out to 2 Mpc. Making the simple assumptions that non-thermal X-ray emission originates from Inverse Compton scattering of relativistic electrons off of the microwave background photons and that the magnetic field is frozen into the intracluster medium, we have produced a non-thermal radial profile using the radio synchrotron spectrum parameters. This non-thermal profile diverges significantly from the beta-model with increasing radius. The image has a high signal-to-noise ratio over most of the cluster and constrains the maximum allowable ratio of non-thermal to total emission to be less than 1%. This value is normalized to the same energy band and region as the previoulsy reported value of 17% based on SAX observations (Kaastra et al., 1999, ApJ, 519L, 119). We further explore more generalized models for the radial distribution of non-thermal emission.

This research was supported by NASA and NSF.

The author(s) of this abstract have provided an email address for comments about the abstract: mronqu1@umbc.edu

[Previous] | [Session 51] | [Next]