Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Chandra and XMM Observations of the ADC Source 0921-630   We analyze observations of the low mass X-ray binary 2S0921-63 obtained with
the gratings and CCDs on Chandra and XMM. This object is a high inclination
system showing evidence for an accretion disk corona (ADC). Such a corona has
the potential to constrain the properties of the heated accretion disk in this
system, and other LMXBs by extension. We find evidence for line emission which
is generally consistent with that found by previous experiments, although we
are able to detect more lines. For the first time in this source, we find that
the iron K line has multiple components. We set limits on the line widths and
velocity offsets, and we fit the spectra to photoionization models and discuss
the implications for accretion disk corona models. For the first time in any
ADC source we use these fits, together with density constraints based on the O
VII line ratio, in order to constrain the flux in the medium-ionization region
of the ADC. Under various assumptions about the source luminosity this
constrains the location of the emitting region. These estimates, together with
estimates for the emission measure, favor a scenario in which the intrinsic
luminosity of the source is comparable to what we observe.

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The categories of this paper are: nucl-th
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The categories of this paper are: stat
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The categories of this paper are: supr-con
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The categories of this paper are: math-ph
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The categories of this paper are: physics
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The categories of this paper are: hep-ph
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The categories of this paper are: q-fin
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The categories of this paper are: nucl-ex
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The categories of this paper are: gr-qc
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The categories of this paper are: atom-ph
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The categories of this paper are: ao-sci
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The categories of this paper are: math
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The categories of this paper are: cond-mat
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The categories of this paper are: bayes-an
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The categories of this paper are: solv-int
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The categories of this paper are: comp-gas