Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Jet-Disk Connection and Blazar Unification   We discuss the relation between the power carried by relativistic jets and
the nuclear power provided by accretion, for a group of blazars including FSRQs
and BL Lac objects. They are characterized by good quality broad band X-ray
data provided by the Beppo SAX satellite. The jet powers are estimated using
physical parameters determined from uniformly modelling their spectral energy
distributions (SEDs). Our analysis indicates that for Flat Spectrum Radio
Quasars the total jet power is of the same order as the accretion power. We
suggest that blazar jets are likely powered by energy extraction from a rapidly
spinning black hole through the magnetic field provided by the accretion disk.
FSRQs must have large BH masses (10^8 - 10^9 solar masses) and high, near
Eddington accretion rates. For BL Lac objects the jet luminosity is larger than
the disk luminosity. This can be understood within the same scenario if BL Lac
objects have masses similar to FSRQ but accrete at largely subcritical rates,
whereby the accretion disk radiates inefficiently. Thus the ``unification'' of
the two classes into a single blazar population, previously proposed on the
basis of a spectral sequence governed by luminosity, finds a physical basis.

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The categories of this paper are: math-ph
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The categories of this paper are: econ
31
The categories of this paper are: ao-sci
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The categories of this paper are: acc-phys
1
The categories of this paper are: cs
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The categories of this paper are: plasm-ph
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The categories of this paper are: patt-sol
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The categories of this paper are: hep-lat
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The categories of this paper are: hep-th
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The categories of this paper are: bayes-an
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The categories of this paper are: nucl-ex
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The categories of this paper are: physics
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The categories of this paper are: dg-ga
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The categories of this paper are: solv-int
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The categories of this paper are: supr-con
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The categories of this paper are: quant-ph