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Astrophysics > High Energy Astrophysical Phenomena

arXiv:2108.02142 (astro-ph)
[Submitted on 4 Aug 2021]

Title:J2102+6015: a young radio source at z = 4.575

Authors:Yingkang Zhang, Tao An, Sándor Frey, Xiaolong Yang, Máté Krezinger, Oleg Titov, Alexey Melnikov, Pablo de Vicente, Fengchun Shu, Ailing Wang
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Abstract:Jets of high-redshift active galactic nuclei (AGNs) can be used to directly probe the activity of the black holes in the early Universe. Radio sources with jets misaligned with respect to the line of sight are expected to dominate the high-redshift AGN population. In this paper, we present the high-resolution imaging results of a z=4.57 AGN J2102+6015 by analyzing its multi-epoch dual-frequency very long baseline interferometry (VLBI) data. The 8.4-GHz VLBI images reveal two major features along the east-west direction separated by $\sim$ 10 milli-arcsec (mas). From the spectral index map, both features show flat/inverted spectra. The separation between the two features remains almost unchanged over an observation period of $\sim$ 13 years, placing an upper limit of the separation speed as about 0.04 mas year$^{-1}$. Previous studies have classified the source as a GHz-peaked spectrum quasar. Our results indicate that J2102+6015 is most likely a young, compact symmetric object rather than a blazar-type core-jet source.
Comments: 11 pages, 5 figures, accepted by MNRAS
Subjects: High Energy Astrophysical Phenomena (astro-ph.HE); Astrophysics of Galaxies (astro-ph.GA)
Cite as: arXiv:2108.02142 [astro-ph.HE]
  (or arXiv:2108.02142v1 [astro-ph.HE] for this version)
  https://doi.org/10.48550/arXiv.2108.02142
Related DOI: https://doi.org/10.1093/mnras/stab2289

Submission history

From: Yingkang Zhang [view email]
[v1] Wed, 4 Aug 2021 16:14:45 UTC (894 KB)
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