Radio Galaxy Zoo: Cosmological Alignment of Radio Sources
O. Contigiani, F. de Gasperin, G. K. Miley, L. Rudnick, H. Andernach,, J. K. Banfield, A. D. Kapi\'nska, S. S. Shabala, O. I. Wong

TL;DR
This study investigates the alignment of radio sources in two large surveys, finding marginal evidence of local alignment at small scales in the FIRST survey, which may indicate cosmological-scale structures.
Contribution
It introduces an automated process for source identification in the TGSS survey and provides the first systematic analysis of radio source alignment across large sky areas.
Findings
Marginal local alignment detected in FIRST survey at scales less than 2.5°
Alignment is most prominent at scales up to 1.5°
TGSS survey data too sparse to confirm similar alignment
Abstract
We study the mutual alignment of radio sources within two surveys, FIRST and TGSS. This is done by producing two position angle catalogues containing the preferential directions of respectively and extended sources distributed over more than and square degrees. The identification of the sources in the FIRST sample was performed in advance by volunteers of the Radio Galaxy Zoo project, while for the TGSS sample it is the result of an automated process presented here. After taking into account systematic effects, marginal evidence of a local alignment on scales smaller than is found in the FIRST sample. The probability of this happening by chance is found to be less than per cent. Further study suggests that on scales up to the alignment is maximal. For one third of the sources, the Radio Galaxy Zoo volunteers identified an…
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