Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Broad-line and Multi-wave Band Emission from Blazars   We study the correlations of the flux of the broad-line emission ($F_{BLR}$)
with the X-ray emission flux, optical emission flux at 5500 \AA and radio
emission flux at 5 GHz, respectively, for a large sample of 50 Blazars (39
flat-spectrum radio quasars (FSRQs) and 11 BL Lac objects). Our main results
are as follows. There are very strong correlations between $F_{BLR}$ and
$F_{X}$ and between $L_{BLR}$ and $L_{X}$ in both states for 39 FSRQs and the
slopes of the linear regression equations are almost equal to 1. There are weak
correlations between $F_{BLR}$ and $F_{X}$ and between $L_{BLR}$ and $L_{X}$
for 11 BL Lac objects in both states, and the slopes of the linear regression
equations are close to 1. There are significant correlations between $F_{BLR}$
and $F_{X}$ and between $L_{BLR}$ and $L_{X}$ for 50 blazars in both states,
the slopes of both the linear regression equations are also close to 1. These
results support a close link between relativistic jets and accretion on to the
central Kerr black hole. On the other hand, we find that BL Lac objects have
low accretion efficiency $\eta$, whereas FSRQs have high accretion efficiency
$\eta$. The unified model of FSRQs and BL Lac objects is also discussed.

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The categories of this paper are: atom-ph
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The categories of this paper are: mtrl-th
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The categories of this paper are: q-fin
4
The categories of this paper are: cond-mat
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The categories of this paper are: gr-qc
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The categories of this paper are: dg-ga
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The categories of this paper are: q-alg
1
The categories of this paper are: cs
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The categories of this paper are: quant-ph
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The categories of this paper are: nucl-ex
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The categories of this paper are: q-bio
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The categories of this paper are: bayes-an
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The categories of this paper are: hep-th
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The categories of this paper are: funct-an
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The categories of this paper are: nlin
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The categories of this paper are: math-ph