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First look at the giant radio galaxy 3C 236 with LOFAR

Shulevski, A.; Barthel, P. D.; Morganti, R.; Harwood, J. J.; Brienza, M.; Shimwell, T. W.; Röttgering, H. J. A.; White, G. J.; Callingham, J. R.; Mooney, S. and Rafferty, D. A. (2019). First look at the giant radio galaxy 3C 236 with LOFAR. Astronomy & Astrophysics, 628, article no. A69.

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We have examined the giant radio galaxy 3C 236 using LOFAR at 143 MHz down to an angular resolution of 7″, in combination with observations at higher frequencies. We used the low frequency data to derive spectral index maps with the highest resolution yet at these low frequencies. We confirm a previous detection of an inner hotspot in the north-west lobe and for the first time observe that the south-east lobe hotspot is in fact a triple hotspot, which may point to an intermittent source activity. Also, the spectral index map of 3C 236 shows that the spectral steepening at the inner region of the northern lobe is prominent at low frequencies. The outer regions of both lobes show spectral flattening, in contrast with previous high frequency studies. We derive spectral age estimates for the lobes, as well as particle densities of the IGM at various locations. We propose that the morphological differences between the lobes are driven by variations in the ambient medium density as well as the source activity history.

Item Type: Journal Item
Copyright Holders: 2019 ESO
ISSN: 0004-6361
Keywords: galaxies: active; radio continuum: galaxies; galaxies: individual: 3C 236
Academic Unit/School: Faculty of Science, Technology, Engineering and Mathematics (STEM) > Physical Sciences
Faculty of Science, Technology, Engineering and Mathematics (STEM)
Item ID: 66281
Depositing User: ORO Import
Date Deposited: 23 Aug 2019 08:11
Last Modified: 24 Aug 2019 16:28
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