FSRQ/BL Lac dichotomy as the magnetized advective accretion process around black holes: a unified classification of blazars. (arXiv:1904.05898v1 [astro-ph.HE])

FSRQ/BL Lac dichotomy as the magnetized advective accretion process around black holes: a unified classification of blazars. (arXiv:1904.05898v1 [astro-ph.HE])
<a href="http://arxiv.org/find/astro-ph/1/au:+Mondal_T/0/1/0/all/0/1">Tushar Mondal</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Mukhopadhyay_B/0/1/0/all/0/1">Banibrata Mukhopadhyay</a>

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 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 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.

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 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 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.

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