Abstract
Using a homogenous sample of 1962 quasars with redshift 3.0≤z≲4.5 drawn from the Sloan Digital Sky Survey (SDSS), we study the relationships between radio loudness, virial black hole (BH) mass and Eddington ratio (accretion rate relative to the Eddington limit). For the radio-detected objects, we find a significant (>99.5 per cent) anticorrelation between radio loudness R parameter and BH mass, consistent with previous studies of low-redshift radio-loud quasars. The truly radio-loud quasars (R>30) are found to be confined to MBH≲1010 M⊙ within our sample. We also find that R is only weakly correlated with Eddington ratio Lbol/LEdd. Combined with previous results on the low-redshift R−Lbol/LEdd relation, this result indicates no strong Lbol/LEdd dependence of R at Lbol/LEdd≳10−2. On the other hand, the large scatter in these relationships suggests that other physical properties such as BH spin and quasar clustering must also play an important role in quasar radio emission.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.