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http://hdl.handle.net/20.500.12386/29930
Titolo: | NGC 326: X-shaped no more | Autori: | Hardcastle, M. J. Croston, J. H. Shimwell, T. W. Tasse, C. Gürkan, G. Morganti, R. MURGIA, MATTEO Röttgering, H. J. A. van Weeren, R. J. Williams, W. L. |
Data pubblicazione: | 2019 | Rivista: | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | Numero: | 488 | Fascicolo: | 3 | Da pagina:: | 3416 | Abstract: | We present new 144-MHz Low-Frequency Array (LOFAR) observations of the prototypical `X-shaped' radio galaxy NGC 326, which show that the formerly known wings of the radio lobes extend smoothly into a large-scale, complex radio structure. We argue that this structure is most likely the result of hydrodynamical effects in an ongoing group or cluster merger, for which pre-existing X-ray and optical data provide independent evidence. The large-scale radio structure is hard to explain purely in terms of jet reorientation due to the merger of binary black holes, a previously proposed explanation for the inner structure of NGC 326. For this reason, we suggest that the simplest model is one in which the merger-related hydrodynamical processes account for all the source structure, though we do not rule out the possibility that a black hole merger has occurred. Inference of the black hole-black hole merger rate from observations of X-shaped sources should be carried out with caution in the absence of deep, sensitive low-frequency observations. Some X-shaped sources may be signposts of cluster merger activity, and it would be useful to investigate the environments of these objects more generally. | URI: | http://hdl.handle.net/20.500.12386/29930 | URL: | https://academic.oup.com/mnras/article/488/3/3416/5531325 | ISSN: | 0035-8711 | DOI: | 10.1093/mnras/stz1910 | Bibcode ADS: | 2019MNRAS.488.3416H | Fulltext: | open |
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