Details

Autor(en) / Beteiligte

• Liu, Yuanqi
• An, Tao
• Guo, Shaoguang
• Zhang, Yingkang
• Wang, Ailing
• Xu, Zhijun
• Khorunzhev, Georgii
• Sotnikova, Yulia
• Mufakharov, Timur
• Mikhailov, Alexander
• Mingaliev, Marat

Titel

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.