- Title
- Alignment in the orientation of LOFAR radio sources:
- Creator
- Osinga, E, Miley, G K, van Weeren, R J, Shimwell, T W, Duncan, K J, Hardcastle, M J, Mechev, A P, Röttgering, H J A, Tasse, C, Williams, W L
- Date
- 2020
- Type
- text
- Type
- article
- Identifier
- http://hdl.handle.net/10962/163452
- Identifier
- vital:41039
- Identifier
- https://doi.org/10.1051/0004-6361/202037680
- Description
- Various studies have laid claim to finding an alignment of the polarization vectors or radio jets of active galactic nuclei over large distances, but these results have proven controversial and so far, there is no clear explanation for this observed alignment. To investigate this case further, we tested the hypothesis that the position angles of radio galaxies are randomly oriented in the sky by using data from the Low-Frequency Array (LOFAR) Two-metre Sky Survey (LoTSS). A sample of 7555 double-lobed radio galaxies was extracted from the list of 318 520 radio sources in the first data release of LoTSS at 150 MHz. We performed statistical tests for uniformity of the two-dimensional (2D) orientations for the complete 7555 source sample. We also tested the orientation uniformity in three dimensions (3D) for the 4212 source sub-sample with photometric or spectroscopic redshifts.
- Format
- Language
- English
- Relation
- Astronomy and Astrophysics, Osinga, E., Miley, G.K., van Weeren, R.J., Shimwell, T.W., Duncan, K.J., Hardcastle, M.J., Mechev, A.P., Röttgering, H.J.A., Tasse, C. and Williams, W.L., 2020. Alignment in the orientation of LOFAR radio sources. Astronomy and Astrophysics, 642, p.A70, Astronomy and Astrophysics volume 642 number July 2020 1432-0746
- Rights
- Publisher
- Rights
- Use of this resource is governed by the terms and conditions of the Astronomy and Astrophysics Copyright and Permission Statement (https://www.aanda.org/about-aa/copyright)
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