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Very long baseline interferometry observations of the high-redshift X-ray-bright blazar SRGE J170245.3+130104
Ist Teil von
Astronomy and astrophysics (Berlin), 2024-05, Vol.685, p.A111
Ort / Verlag
Heidelberg: EDP Sciences
Erscheinungsjahr
2024
Quelle
Free E-Journal (出版社公開部分のみ)
Beschreibungen/Notizen
Aims.
The X-ray luminous and radio-loud active galactic nucleus (AGN) SRGE J170245.3+130104 discovered at
z
∼ 5.5 provides unique chances to probe the growth and evolution of a supermassice black hole (SMBH) with powerful jets in the early Universe.
Methods.
We present 1.35 − 5.1 GHz Very Long Baseline Array (VLBA) results regarding the radio continuum emission and a spectral analysis of this quasar in a low-flux-density state.
Results.
This source is unresolved at three frequencies, with total flux densities of 8.35 ± 0.09 Jy beam
−1
, 7.47 ± 0.08 Jy beam
−1
, and 6.57 ± 0.02 Jy beam
−1
at 1.73 GHz, 2.26 GHz, and 4.87 GHz, respectively. Meanwhile, the brightness temperature is higher than 10
9
K.
Conclusions.
Compared with previous radio observations with arcsecond-scale resolution, nearly all the radio emission from this source is concentrated in the very central milliarcsecond (mas) scale area. We confirm this source is a bright blazar at
z
> 5. This young AGN provides a great opportunity to understand the mechanisms behind the generation of strong jets in the early Universe.