Query : 2020A&A...643L..12S

2020A&A...643L..12S - Astronomy and Astrophysics, volume 643, L12-12 (2020/11-1)

Parsec-scale properties of the radio brightest jetted AGN at z > 6.


Abstract (from CDS):

We present Director's Discretionary Time multi-frequency observations obtained with the Jansky Very Large Array and the Very Long Baseline Array (VLBA) of the blazar PSO J030947.49+271757.31 (hereafter PSO J0309+27) at z=6.10±0.03. The milliarcsecond angular resolution of our VLBA observations at 1.5, 5, and 8.4 GHz unveils a bright one-sided jet extended for ∼500 parsecs in projection. This high-z radio-loud active galactic nucleus is resolved into multiple compact sub-components that are embedded in a more diffuse and faint radio emission that enshrouds them in a continuous jet structure. We directly derive limits on some physical parameters from observable quantities such as viewing angle and Lorentz and Doppler factors. If PSO J0309+27 is a genuine blazar, as suggested by its X-ray properties, then we find that its bulk Lorentz factor must be relatively low (lower than 5). This value would be in favour of a scenario currently proposed to reconcile the paucity of high-z blazars with current predictions. Nevertheless, we cannot exclude that PSO J0309+27 is seen under a larger viewing angle, which would imply that the X-ray emission must be enhanced, for example, by inverse Compton scattering with the cosmic microwave background. More stringent constraints on the bulk Lorentz factor in PSO J0309+27 and on these factors in the other high-z blazars are necessary to test whether their properties are intrinsically different from those of the low-z blazar population.

Abstract Copyright: © ESO 2020

Journal keyword(s): galaxies: active - galaxies: jets - early Universe - techniques: high angular resolution - techniques: interferometric - quasars: individual: PSO J030947.49+271757.3

CDS comments: PSO J030947.49+271757.31 is NVSS J030947+271757 in SIMBAD.

Simbad objects: 4

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Number of rows : 4
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
1 PSO J047.4478+27.2992 Bla 03 09 47.44 +27 17 57.6           ~ 29 0
2 NVSS J031629+273308 Rad 03 16 29.0121704448 +27 33 08.147285928           ~ 3 1
3 7C 055201.39+394824.00 QSO 05 55 30.80561419 +39 48 49.1649683     18.30 17.5   ~ 494 2
4 CFHQS J142952+544717 QSO 14 29 52.17 +54 47 17.7           ~ 44 0

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