Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: X-ray emission from active galactic nuclei with intermediate mass black
  holes   We present a systematic X-ray study of eight AGNs with intermediate mass
black holes (M_BH 8-95x10^4 Msun) based on 12 XMM-Newton observations. The
sample includes the two prototype AGNs in this class - NGC4395 and POX52 and
six other AGNs discovered with the SDSS. These AGNs show some of the strongest
X-ray variability with the normalized excess variances being the largest and
the power density break time scales being the shortest observed among
radio-quiet AGNs. The excess variance -- luminosity correlation appears to
depend on both the BH mass and the Eddington luminosity ratio. The break time
scale -- black hole mass relations for AGN with IMBHs are consistent with that
observed for massive AGNs. We find that the FWHM of the Hbeta or Halpha line is
uncorrelated with the BH mass, but shows strong anticorrelation with the
Eddington luminosity ratio. Four AGNs show clear evidence for soft X-ray excess
emission (kT_in~150-200eV). X-ray spectra of three other AGNs are consistent
with the presence of the soft excess emission. NGC4395 with lowest L/L_Edd
lacks the soft excess emission. Evidently small black mass is not the primary
driver of strong soft X-ray excess emission from AGNs. The X-ray spectral
properties and optical-to-X-ray spectral energy distributions of these AGNs are
similar to those of Seyfert 1 galaxies. The observed X-ray/UV properties of
AGNs with IMBHs are consistent with these AGNs being low mass extension of more
massive AGNs; those with high Eddington luminosity ratio looking more like
narrow-line Seyfert 1s while those with low $L/L_{Edd}$ looking more like
broad-line Seyfert 1s.

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The categories of this paper are: alg-geom
9
The categories of this paper are: nlin
16
The categories of this paper are: stat
20
The categories of this paper are: acc-phys
3
The categories of this paper are: physics
18
The categories of this paper are: econ
8
The categories of this paper are: hep-ex
10
The categories of this paper are: q-bio
30
The categories of this paper are: q-alg
7
The categories of this paper are: hep-th
26
The categories of this paper are: bayes-an
13
The categories of this paper are: quant-ph
11
The categories of this paper are: hep-lat
0
The categories of this paper are: hep-ph
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The categories of this paper are: cmp-lg
19
The categories of this paper are: eess