J2102+6015

An intriguing radio-loud active galactic nucleus in the early universe

Journal article (2023)

Authors

Sándor Frey Eötvös University, Konkoly Observatory Hungarian Academy of Sciences
Tao Liu Chinese Academy of Sciences
K. E. Gabányi Eötvös University, Konkoly Observatory Hungarian Academy of Sciences
L. Gurvits Joint Institute for VLBI ERIC,
Máté Krezinger Eötvös University, Konkoly Observatory Hungarian Academy of Sciences
Alexey Melnikov Institute of Applied Astronomy of the Russian Academy of Sciences
Prashanth Mohan Chinese Academy of Sciences
Zsolt Paragi Joint Institute for VLBI ERIC
K. Perger Konkoly Observatory Hungarian Academy of Sciences
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Copyright: © 2023 Sándor Frey, Tao An, Krisztina Gabányi, L. Gurvits, Máté Krezinger, Alexey Melnikov, Prashanth Mohan, Zsolt Paragi, Krisztina Perger, More Authors
DOI: https://doi.org/10.22323/1.428.0022
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Published Date

2023

Language

English

Abstract

The powerful high-redshift quasar J2102+6015 (at z = 4.575) may provide useful information for studying supermassive black hole growth, galaxy evolution and feedback in the early Universe. The source has so far been imaged with very-long-baseline interferometry (VLBI) at 2/8 GHz (S/X) bands only, showing complex compact structure. Its total radio spectrum peaks at ∼ 6 GHz in the rest frame. There is no sign of Doppler-boosted jet emission, and the separation of the two major features in its east-west oriented structure spanning ∼ 10 milliarcseconds does not change significantly on a timescale longer than a decade. However, VLBI astrometric monitoring observations suggest quasi-periodic (∼ 3 yr) variation in its absolute position. J2102+6015 is presumably a young radio source with jets misaligned with respect to the line of sight. Here we briefly report on our new high-resolution imaging observations made with the European VLBI Network (EVN) at 5 and 22 GHz frequencies in 2021 June, and give an overview of what is currently known about this peculiar, distant jetted active galactic nucleus.