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dc.contributor.authorAcharya, Sandeep Kumar-
dc.contributor.authorMajumdar, Subhabrata-
dc.contributor.authorNath, Biman-
dc.identifier.citationMonthly Notices of the Royal Astronomical Society, 2021, Vol. 503, p5473-5484en_US
dc.identifier.issn1365-2966 (Online)-
dc.descriptionRestricted Access. An open-access version is available at (one of the alternative locations)en_US
dc.description.abstractEnergetic electrons in the lobes of radio galaxies make them potential sources for not only radio and X-rays but also Sunyaev–Zeldovich (SZ) distortions in the cosmic microwave background (CMB) radiation. Previous works have discussed the energetics of radio galaxy lobes, but assuming thermal SZ effect, coming from the non-thermal electron population. We use an improved evolutionary model for radio galaxy lobes to estimate the observed parameters such as the radio luminosity and intensity of SZ-distortions at the redshifts of observation. We, further, quantify the effects of various relevant physical parameters of the radio galaxies, such as the jet power, the time-scale over which the jet is active, the evolutionary time-scale for the lobe, etc. on the observed parameters. For current SZ observations towards galaxy clusters, we find that the non-thermal SZ distortions from radio lobes embedded in galaxy clusters can be non-negligible compared to the amount of thermal SZ distortion from the intracluster medium and, hence, cannot be neglected. We show that small and young (and preferably residing in a cluster environment) radio galaxies offer better prospects for the detection of the non-thermal SZ signal from these sources. We further discuss the limits on different physical parameters for some sources for which SZ effect has been either detected or upper limits are available. The evolutionary models enable us to obtain limits, previously unavailable, on the low energy cut-off of electron spectrum (pmin ∼ 1–2) in order to explain the recent non-thermal SZ detection. Finally, we discuss how future CMB experiments, which would cover higher frequency bands (>400 GHz), may provide clear signatures for non-thermal SZ effect.en_US
dc.publisherOxford University Press on behalf of the Royal Astronomical Societyen_US
dc.rights2021 The Author(s)en_US
dc.subjectcosmic background radiationen_US
dc.titleNon-thermal Sunyaev–Zeldovich signal from radio galaxy lobesen_US
Appears in Collections:Research Papers (A&A)

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