Extended X-ray emission associated with the radio lobes and the environments of 60 radio galaxies
| Autor: | Gill, Ajay, Boyce, Michelle M., O'Dea, Christopher P., Baum, Stefi A., Kharb, Preeti, Campbell, Neil, Tremblay, Grant R., Kundu, Suman |
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| Rok vydání: | 2021 |
| Předmět: | |
| Zdroj: | The Astrophysical Journal, Volume 912, Number 2, pp 19, 2021 |
| Druh dokumentu: | Working Paper |
| DOI: | 10.3847/1538-4357/abec74 |
| Popis: | This paper studied the faint, diffuse extended X-ray emission associated with the radio lobes and the hot gas in the intracluster medium (ICM) environment for a sample of radio galaxies. We used shallow ($\sim 10$ ks) archival Chandra observations for 60 radio galaxies (7 FR I and 53 FR II) with $0.0222 \le z \le 1.785$ selected from the 298 extragalactic radio sources identified in the 3CR catalog. We used Bayesian statistics to look for any asymmetry in the extended X-ray emission between regions that contain the radio lobes and regions that contain the hot gas in the ICM. In the Chandra broadband ($0.5 - 7.0$ keV), which has the highest detected X-ray flux and the highest signal-to-noise ratio, we found that the non-thermal X-ray emission from the radio lobes dominates the thermal X-ray emission from the environment for $\sim 77\%$ of the sources in our sample. We also found that the relative amount of on-jet axis non-thermal emission from the radio lobes tends to increase with redshift compared to the off-jet axis thermal emission from the environment. This suggests that the dominant X-ray mechanism for the non-thermal X-ray emission in the radio lobes is due to the inverse Compton upscattering of cosmic microwave background (CMB) seed photons by relativistic electrons in the radio lobes, a process for which the observed flux is roughly redshift independent due to the increasing CMB energy density with increasing redshift. Comment: 19 pages, 18 figures |
| Databáze: | arXiv |
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