Mondal, Tushar and Mukhopadhyay, Banibrata (2019) FSRQ/BL Lac dichotomy as the magnetized advective accretion process around black holes: a unified classification of blazars. In: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 486 (3). pp. 3465-3472.
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The Fermi blazar observations show a strong correlation between gamma-ray luminosities and spectral indices. BL Lac objects are less luminous with harder spectra than flat-spectrum radio quasars (FSRQs). Interestingly FSRQs are evident to exhibit a Keplerian disc component along with a powerful jet. We compute the jet intrinsic luminosities by beaming corrections determined by different cooling mechanisms. Observed gamma-ray luminosities and spectroscopic measurements of broad emission lines suggest a correlation of the accretion disc luminosity with the jet intrinsic luminosity. Also, theoretical and observational inferences for these jetted sources indicate a signature of hot advective accretion flow and a dynamically dominant magnetic field at the jet footprint. Indeed it is difficult to imagine the powerful jet launching from a geometrically thin Keplerian disc. We propose a magnetized, advective disc-outflow symbiosis with explicit cooling to address a unified classification of blazars by controlling both the mass accretion rate and magnetic field strength. The large-scale strong magnetic fields influence the accretion dynamics, remove angular momentum from the infalling matter, help in the formation of strong outflows/jets, and lead to synchrotron emissions simultaneously. We suggest that the BL Lacs are more optically thin and magnetically dominated than FSRQs at the jet footprint to explain their intrinsic gamma-ray luminosities.
| Item Type: | Journal Article |
|---|---|
| Publication: | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY |
| Publisher: | OXFORD UNIV PRESS |
| Additional Information: | Copyright for this article belongs to OXFORD UNIV PRESS |
| Keywords: | accretion, accretion discs; MHD; radiation mechanisms: non-thermal; galaxies: jets; BL Lacertae objects: general |
| Department/Centre: | Division of Physical & Mathematical Sciences > Physics |
| Date Deposited: | 24 Dec 2019 08:23 |
| Last Modified: | 24 Dec 2019 08:23 |
| URI: | http://eprints.iisc.ac.in/id/eprint/63311 |
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