VLBI observations of the high-redshift X-ray bright blazar SRGE J170245.3+130104

• Published in: arXiv.org 2024-02
• Main Authors: Liu, Yuanqi, An, Tao, Guo, Shaoguang, Zhang, Yingkang, Wang, Ailing, Xu, Zhijun, Khorunzhev, Georgii, Sotnikova, Yulia, Mufakharov, Timur, Mikhailov, Alexander, Mingaliev, Marat
• Format: Article
• Language: English
• Subjects: Active galactic nuclei; Blazars; Brightness temperature; Continuum radiation; Emission analysis; Flux density; Quasars; Radio emission; Radio observation; Red shift; Spectrum analysis; Universe; X-ray astronomy
• ISSN: 2331-8422
• DOI: 10.48550/arxiv.2402.19202

Aims. The X-ray luminous and radio-loud AGN SRGE J170245.3+130104 discovered at z \(\sim\) 5.5 provides unique chances to probe the SMBH growth and evolution with powerful jets in the early Universe. Methods. We present 1.35 - 5.1 GHz Very Long Baseline Array (VLBA) results on the radio continuum emission and spectrum analysis for this quasar in a low flux density state. Results. This source is unresolved at three frequencies with the total flux densities of 8.35\(\pm\)0.09 mJy beam-1, 7.47\(\pm\)0.08 mJy beam-1, and 6.57\(\pm\)0.02 mJy beam-1 at 1.73 GHz, 2.26 GHz, and 4.87 GHz, respectively. Meanwhile, the brightness temperature is higher than 109 K. Conclusions. Compared with previous radio observations with arcsec-scale resolution, nearly all the radio emission from this source concentrates in the very central milli-arcsecond (mas) scale area. We confirm this source is a bright blazar at z > 5. This young AGN provide us the great chances to understand the first generation of strong jets in the early Universe.