Title: X-ray Emission of High-Redshift Jetted Active Galactic Nuclei

　　Speaker: Jianfeng Wu (Xiamen University)

　　Time: 2：30 pm, January 3 (Thursday)

　　Location: Lecture Hall, 3rd floor

　　Abstract:

In this talk I will present two related works on high-redshift jetted AGNs. In the first work we performed a systematic study of the X-ray and multiwavelength properties of the highly radio-loud quasars (HRLQs) at z>4. In contrast to previous studies on radio-quiet and moderately radio-loud quasars, we found our HRLQs have an X-ray emission enhancement over HRLQs at lower redshifts with similar radio and UV/optical luminosity and radio loudness values. Our further study with a larger sample confirmed this X-ray emission enhancement. This enhancement can be explained by a fractional IC/CMB mechanism inverse Compton scattering of the CMB photons for the jet-linked X-ray emission. The second work is focused on extended X-ray emission of radio galaxies. We studied the viability of the IC/CMB mechanism to quench the radio emission of the high-redshift jetted AGNs as a possible cause of the apparent depletion in the number density of high-redshift radio-loud AGNs.