Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Swift BAT Survey Detects Two Optical Broad Line, X-ray Heavily
  Obscured Active Galaxies: NVSS 193013+341047 and IRAS 05218-1212   The Swift Burst Alert Telescope (BAT) is discovering interesting new objects
while monitoring the sky in the 14-195 keV band. Here we present the X-ray
properties and spectral energy distributions for two unusual AGN sources. Both
NVSS 193013+341047 and IRAS 05218-1212 are absorbed, Compton-thin, but heavily
obscured (NH \sim 10^23 cm-2), X-ray sources at redshifts < 0.1. The spectral
energy distributions reveal these galaxies to be very red, with high extinction
in the optical and UV. A similar SED is seen for the extremely red objects
(EROs) detected in the higher redshift universe. This suggests that these
unusual BAT-detected sources are a low- redshift (z << 1) analog to EROs, which
recent evidence suggests are a class of the elusive type II quasars. Studying
the multi-wavelength properties of these sources may reveal the properties of
their high redshift counterparts.

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The categories of this paper are: hep-ph
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The categories of this paper are: q-alg
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The categories of this paper are: hep-th
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The categories of this paper are: physics
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The categories of this paper are: q-bio
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The categories of this paper are: adap-org
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The categories of this paper are: nucl-ex
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The categories of this paper are: bayes-an
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The categories of this paper are: ao-sci
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The categories of this paper are: econ
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The categories of this paper are: quant-ph
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The categories of this paper are: math-ph
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The categories of this paper are: solv-int
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The categories of this paper are: acc-phys
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The categories of this paper are: stat
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The categories of this paper are: q-fin