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

Details Spatially Derived Limits on Non-thermal Emission From the Abell 2199 Galaxy Cluster Spatially Derived Limits on Non-thermal Emission From the Abell 2199 Galaxy Cluster

May 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aas...196.5107r&link_type=abstract

American Astronomical Society, 196th AAS Meeting, #51.07; Bulletin of the American Astronomical Society, Vol. 32, p.756

Astronomy and Astrophysics

Astronomy

Scientific paper

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.

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