Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Thermal AGN Signatures in Blazars   Long ignored in blazars because of the dominance of the beamed radiation from
the jet, the topic of thermal emissions in these objects is just beginning to
be explored. While this emission is weak in most blazars compared to the
dominant nonthermal jet components, there is a growing body of evidence that
suggests that thermal emission is observable even in the most highly beamed
objects. The emitting regions, which can include the accretion disk as well as
the torus, are key parts of the central engine which also powers the jets. They
also may be of critical importance in helping us decide between unified scheme
models. We will review the observational evidence for thermal emissions in
blazars, with an emphasis on recent work, and the spectral and variability
characteristics that have been observed. The majority of the evidence for
thermal emission in blazars (now observed in several objects) has come as a
result of multiwavelength campaigns, where the object showed a clear bump in
the optical-UV in a faint state. However, evidence exists from other avenues as
well, including both purely spectral and variability based arguments as well as
statistical analyses of large samples of objects. We will also discuss the
impact of thermal emission on an object's overall SED, including its
Comptonized signatures. Finally, we will assess the current standing of unified
scheme models as respects thermal signatures and the prospects for detecting
thermal emission with new telescopes and missions, and further utilizing it as
a probe of the central engine of blazars.

30
The categories of this paper are: q-alg
27
The categories of this paper are: comp-gas
35
The categories of this paper are: mtrl-th
21
The categories of this paper are: adap-org
37
The categories of this paper are: supr-con
28
The categories of this paper are: alg-geom
3
The categories of this paper are: physics
31
The categories of this paper are: ao-sci
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The categories of this paper are: eess
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The categories of this paper are: solv-int
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The categories of this paper are: chao-dyn
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The categories of this paper are: chem-ph
2
The categories of this paper are: math
8
The categories of this paper are: hep-ex
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The categories of this paper are: funct-an
1
The categories of this paper are: cs