Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
Local alignments of parsec-scale AGN radiojets. / Mandarakas, N.; Blinov, D.; Casadio, C.; Pelgrims, V.; Kiehlmann, S.; Pavlidou, V.; Tassis, K.
в: Astronomy and Astrophysics, Том 653, A123, 21.09.2021.Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
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TY - JOUR
T1 - Local alignments of parsec-scale AGN radiojets
AU - Mandarakas, N.
AU - Blinov, D.
AU - Casadio, C.
AU - Pelgrims, V.
AU - Kiehlmann, S.
AU - Pavlidou, V.
AU - Tassis, K.
N1 - Publisher Copyright: © ESO 2021.
PY - 2021/9/21
Y1 - 2021/9/21
N2 - Context. Coherence in the characteristics of neighboring sources in the 2D and 3D space may suggest the existence of large-scale cosmic structures that are useful for cosmological studies. Numerous works have been conducted to detect such features in global scales as well as in confined areas of the sky. However, their 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 coordinate-redshift space. Methods. We used data from the Astrogeo VLBI FITS image database to deduce jet directions of radio sources. We performed 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 5σ. We find that this effect is unlikely to be due to instrumental systematics. Intriguingly, their locations coincide with other known large-scale cosmic structures or regions of alignment. Conclusions. If the alignments found here are the result of physical processes, the discovered regions may designate some of the largest structures known to date.
AB - Context. Coherence in the characteristics of neighboring sources in the 2D and 3D space may suggest the existence of large-scale cosmic structures that are useful for cosmological studies. Numerous works have been conducted to detect such features in global scales as well as in confined areas of the sky. However, their 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 coordinate-redshift space. Methods. We used data from the Astrogeo VLBI FITS image database to deduce jet directions of radio sources. We performed 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 5σ. We find that this effect is unlikely to be due to instrumental systematics. Intriguingly, their locations coincide with other known large-scale cosmic structures or regions of alignment. Conclusions. If the alignments found here are the result of physical processes, the discovered regions may designate some of the largest structures known to date.
KW - Galaxies: active
KW - Large-scale structure of Universe
KW - Techniques: interferometric
KW - EXISTENCE
KW - galaxies
KW - interferometric
KW - techniques
KW - large-scale structure of Universe
KW - active
KW - GALAXIES
KW - COHERENT ORIENTATIONS
KW - POLARIZATION
UR - http://www.scopus.com/inward/record.url?scp=85115761648&partnerID=8YFLogxK
U2 - 10.1051/0004-6361/202140764
DO - 10.1051/0004-6361/202140764
M3 - Article
AN - SCOPUS:85115761648
VL - 653
JO - ASTRONOMY & ASTROPHYSICS
JF - ASTRONOMY & ASTROPHYSICS
SN - 0004-6361
M1 - A123
ER -
ID: 87677297