Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: X-ray Properties of LINERs and Low-luminosity Seyfert Galaxies Observed
  with ASCA. I. Observations and Results   This paper presents a comprehensive study of the X-ray properties of
low-ionization nuclear emission-line regions (LINERs) and low-luminosity
Seyfert galaxies based on observations obtained with ASCA. We analyzed data of
53 observations of 21 LINERs and 17 low-luminosity Seyferts. X-ray emission has
been detected in all but one object. The X-ray luminosities in the 2-10 keV
band range from 4e39 ergs/s to 5e41 ergs/s, which are 1-3 orders of magnitude
smaller than in classical Seyfert galaxies. The X-ray spectra of most objects
are well described by a canonical model which consists of (1) a soft component
from a thermal plasma with kT<1 keV and (2) a hard component represented by a
power law with a photon index~1.8 or thermal bremsstrahlung emission with kT~10
keV. Several objects do not require the soft thermal component, and their
continua are well fitted by a single power-law model. Some objects show heavy
absorption with column densities in excess of 1e23 cm^-2. We detect in several
objects Fe K line emission with equivalent widths ranging from 50 eV to 2 keV.
Variability on timescales less than a day is uncommon in our sample. By
comparing multiple observations made with ASCA or with published observations
from other satellites, we show that at least eight objects are variable on
timescales of a week to several years. We find that the morphologies of many
objects, both in the soft and hard bands, are consistent with being pointlike
relative to the telescope PSF; a few are clearly extended in either or both
energy bands.

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The categories of this paper are: chem-ph
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The categories of this paper are: gr-qc
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The categories of this paper are: supr-con
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The categories of this paper are: cmp-lg
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The categories of this paper are: bayes-an
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The categories of this paper are: acc-phys
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The categories of this paper are: physics
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The categories of this paper are: q-fin
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The categories of this paper are: nucl-th
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The categories of this paper are: cs
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The categories of this paper are: hep-ph
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The categories of this paper are: math
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The categories of this paper are: chao-dyn
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The categories of this paper are: q-alg
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The categories of this paper are: mtrl-th
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The categories of this paper are: atom-ph