Evolving parsec-scale radio structure in the most distant blazar known
Tao An (Key Laboratory of Radio Astronomy)
Prashanth Mohan (Chinese Academy of Sciences)
Yingkang Zhang (Chinese Academy of Sciences)
Sándor Frey (Konkoly Observatory Hungarian Academy of Sciences)
Jun Yang (Onsala Space Observatory, TU Delft - Architecture and the Built Environment)
Krisztina Gabányi (Eötvös Loránd University, Konkoly Observatory Hungarian Academy of Sciences, MTA-ELTE Extragalactic Astrophysics Research Group)
Leonid I. Gurvits (TU Delft - Aerospace Engineering, Joint Institute for VLBI ERIC)
Zsolt Paragi (Joint Institute for VLBI ERIC)
Krisztina Perger (Konkoly Observatory Hungarian Academy of Sciences, Eötvös Loránd University)
Zhenya Zheng (Chinese Academy of Sciences)
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Abstract
Blazars are a sub-class of quasars with Doppler boosted jets oriented close to the line of sight, and thus efficient probes of supermassive black hole growth and their environment, especially at high redshifts. Here we report on Very Long Baseline Interferometry observations of a blazar J0906 + 6930 at z = 5.47, which enabled the detection of polarised emission and measurement of jet proper motion at parsec scales. The observations suggest a less powerful jet compared with the general blazar population, including lower proper motion and bulk Lorentz factor. This coupled with a previously inferred high accretion rate indicate a transition from an accretion radiative power to a jet mechanical power based transfer of energy and momentum to the surrounding gas. While alternative scenarios could not be fully ruled out, our results indicate a possibly nascent jet embedded in and interacting with a dense medium resulting in a jet bending.
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