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27 April 2024 |
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Relativistic inverse Compton scattering of photons from the early universe | | Siddharth Malu
; Abhirup Datta
; Sergio Colafrancesco
; Paolo Marchegiani
; Ravi Subrahmanyan
; D Narasimha
; Mark H. Wieringa
; | | Date: |
23 May 2017 | | Abstract: | Electrons at relativistic speeds, diffusing in magnetic fields, cause copious
emission at radio frequencies in both clusters of galaxies and radio galaxies,
through the non-thermal radiation emission called synchrotron. However, the
total power radiated through this mechanism is ill constrained, as the lower
limit of the electron energy distribution, or low-energy cutoffs, for radio
emission in galaxy clusters and radio galaxies have not yet been determined.
This lower limit, parametrized by the lower limit of the electron momentum -
pmin - is critical for estimating the energetics of non-thermal electrons
produced by cluster mergers or injected by radio galaxy jets, which impacts the
formation of large-scale structure in the universe, as well as the evolution of
local structures inside galaxy clusters. The total pressure due to the
relativistic, non-thermal population of electrons is critically dependent on
pmin, making the measurement of this non-thermal pressure a promising technique
to estimate the electron low-energy cutoff. We present here the first
unambiguous detection of this pressure for a non-thermal population of
electrons in a radio galaxy jet/lobe, located at a significant distance away
from the center of the Bullet cluster of galaxies. | | Source: | arXiv, 1705.8405 | | Services: | Forum | Review | PDF | Favorites | |
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