Local alignments of parsec-scale AGN radiojets
  Context.Coherence in the characteristics of neighboring sources in 2D and 3D
space may suggest the existence of large-scale cosmic structures, which are
useful for cosmological studies. Numerous works have been conducted to detect
such features in global scalesas well as in confined areas of the sky. However,
results are often contradictory and their interpretation remains controversial.
Aims.We investigate the potential alignment of parsec-scale radio jets in
localized regions of the coordinates-redshift space. Methods.We use data from
the Astrogeo VLBI FITS image database to deduce jet directions of radio
sources. We perform the search for statistical alignments between nearby
sources and explore the impact of instrumental biases. Results.We unveil four
regions for which the alignment between jet directions deviates from randomness
at a significance level of more than 5 sigma and is unlikely due to
instrumental systematics. Intriguingly, their locations coincide with other
known large-scale cosmic structures and/or regions of alignments.
Conclusions.If the alignments found are the result of physical processes, the
discovered regions may designate some of the largest structures known to date.
