Comptonization of the cosmic microwave background by high energy particles residing in AGN cocoons - Astrophysics > High Energy Astrophysical PhenomenaReportar como inadecuado




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Abstract: X-ray cavities and extended radio sources `cocoons- surrounding activegalactic nuclei AGN have been detected by the Chandra X-ray mission and radiointerferometers. A joint analysis of X-ray and radio maps suggests thatpressure values of non-thermal radio-emitting particles derived from the radiomaps are not sufficient to inflate the X-ray cavities. We propose using theSunyaev-Zel-dovich SZ effect, whose intensity strongly depends on thepressure, to find the hitherto undetected, dynamically-dominant component inthe radio cocoons.We demonstrate that the spectral function at a frequency of 217 GHz has anabsolute maximum at a temperature higher than $10^9$ K, therefore themeasurement of the SZ effect at this frequency is a powerful tool forpotentially revealing the dynamically-dominant component inside AGN jet-drivenradio cocoons. A new method is proposed for excluding the contribution from thelow energy, non-relativistic electrons to the SZ effect by means ofobservations at two frequencies. We show how one may correct for a possiblecontribution from the kinematic SZ effect. The intensity maps of the SZ effectare calculated for the self-similar Sedov solution, and application of apredicted ring-like structure on the SZ map at a frequency of 217 GHz isproposed to determine the energy released during the active jet stage. The SZintensity map for an AGN cocoon in a distant elliptical is calculated using a2-D numerical simulation and including relativistic corrections to the SZeffect. We show the intensity spectrum of the SZ effect is flat at highfrequencies if gas temperature is as high as $k \mathrm{b} T {\mathrm{e}}=500$keV.



Autor: D. A. Prokhorov, V. Antonuccio-Delogu, J. Silk

Fuente: https://arxiv.org/







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