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

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.

11 pages, 5 figures, accepted by MNRAS

References in corpus (13)

• The Quest for Dual and Binary Supermassive Black Holes: A Multi-Messenger View
• The Dynamic Evolution of Young Extragalactic Radio Sources
• The Sixth VLBA Calibrator Survey: VCS6
• VLBA images of High Frequency Peakers
• On the nature of bright compact radio sources at z>4.5
• Evolving parsec-scale radio structure in the most distant blazar known
• Parsec-scale properties of the radio brightest jetted AGN at z > 6
• High-resolution double morphology of the most distant known radio quasar at z=6.12
• Compact Bright Radio-loud AGNs -- III. A Large VLBA Survey at 43 GHz
• High-resolution images of five radio quasars at early cosmological epochs
• Resolving the Radio Emission from the Quasar P172+18 at $z=6.82$
• Radio spectra of bright compact sources at z>4.5
• On the Doppler boosting in the compact radio jet of the distant blazar J1026+2542 at z=5.3

Cited by in corpus (5)

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• Astrometric Apparent Motion of High-redshift Radio Sources
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• J2102+6015: an Intriguing Radio-loud Active Galactic Nucleus in the Early Universe