Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: X-ray Bursts in Neutron Star and Black Hole Binaries from USA and RXTE
  Data: Detections and Upper Limits   Narayan and Heyl (2002) have developed a theoretical framework to convert
suitable upper limits on type I X-ray bursts from accreting black hole
candidates (BHCs) into evidence for an event horizon. However, no appropriate
observational limit exists in the literature. In this paper we survey 2101.2 ks
of data from the Unconventional Stellar Aspect (USA) X-ray timing experiment
and 5142 ks of data from the Rossi X-ray Timing Explorer (RXTE) experiment to
obtain a formal constraint of this type. 1122 ks of neutron star data yield a
population averaged mean burst rate of 1.69 x 10-5 bursts s-1 while 6081 ks of
BHC data yield a 95% confidence level upper limit of 4.9 x 10-7 bursts s-1.
This is the first published limit of this type for Black Hole Candidates.
  Applying the theoretical framework of Narayan and Heyl (2002) we calculate
regions of unstable luminosity where the neutron stars are expected to burst
and the BHCs would be expected to burst if they had a surface. In this unstable
luminosity region 464 ks of neutron star data yield an averaged mean burst rate
of 4.1 x 10-5 bursts s-1 and 1512 ks of BHC data yield a 95% confidence level
upper limit of 2.0 x 10-6 bursts s-1, and a limit of > 10\sigma that BHCs do
not burst with a rate similar to the rate of neutron stars in these unstable
regions. This gives further evidence that BHCs do not have surfaces unless
there is some new physics occurring on their surface.

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The categories of this paper are: hep-ph
8
The categories of this paper are: hep-ex
12
The categories of this paper are: nucl-th
30
The categories of this paper are: q-alg
34
The categories of this paper are: chem-ph
22
The categories of this paper are: chao-dyn
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The categories of this paper are: supr-con
9
The categories of this paper are: nlin
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The categories of this paper are: math
14
The categories of this paper are: math-ph
15
The categories of this paper are: nucl-ex
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The categories of this paper are: cond-mat
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The categories of this paper are: hep-th
10
The categories of this paper are: q-bio
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The categories of this paper are: adap-org
27
The categories of this paper are: comp-gas