Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: ASCA observations of two steep soft X-ray quasars   Steep soft X-ray (0.1-2 keV) quasars share several unusual properties: narrow
Balmer lines, strong FeII emission, large and fast X-ray variability, rather
steep 2-10 keV spectrum. These intriguing objects have been suggested to be the
analogs of Galactic black hole candidates in the high, soft state. We present
here results from ASCA observations for two of these quasars: NAB0205+024 and
PG1244+026. Both objects show similar variations (factor of about 2 in 10 ks),
despite a factor of about ten difference in the 0.5-10 keV luminosity (7.3E43
erg/s for PG1244+026 and 6.4E44 erg/s for NAB0205+024, assuming isotropic
emission, H_0 = 50.0 and q_0 = 0.0). The X-ray continuum of the two quasars
flattens by 0.5-1 going from the 0.1-2 keV band toward higher energies,
strengthening recent results on another half dozen steep soft X-ray AGN.
PG1244+026 shows a significant feature in the `1 keV' region, which can be
described by either as a broad emission line centered at 0.95 keV (quasar
frame) or as edge or line absorption at 1.17 (1.22) keV. The line emission
could be due to reflection from an highly ionized accretion disk, in line with
the view that steep soft X-ray quasars are emitting close to the Eddington
luminosity. Photoelectric edge absorption or resonant line absorption could be
produced by gas outflowing at a large velocity (0.3-0.6 c).

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The categories of this paper are: quant-ph
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The categories of this paper are: plasm-ph
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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: math-ph
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The categories of this paper are: chem-ph
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The categories of this paper are: funct-an
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The categories of this paper are: stat
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The categories of this paper are: cmp-lg
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The categories of this paper are: hep-th
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The categories of this paper are: eess
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The categories of this paper are: dg-ga
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The categories of this paper are: physics
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The categories of this paper are: cond-mat
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The categories of this paper are: hep-ph
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The categories of this paper are: bayes-an