Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: RXTE Broad Band X-ray Spectrum of the Burster 1E1724-3045   The X-ray burster 1E1724-3045 located in the globular cluster Terzan 2 is
known as one of the persistent (though variable) hard X-ray sources as shown by
the SIGMA observations of the Galactic Center region. 1E1724-3045 was observed
with the PCA and HEXTE experiments onboard the RXTE on November 1996 for about
100 ksec. The broad band spectral capability and sensitivity of RXTE enables us
to study simultaneously the X-ray (2-20 keV) and hard X-ray components (E>20
keV) of this source. During the observation, this ``Atoll'' source was in its
``Island'' state characterized by a hard Comptomized spectrum with an electron
temperature kTe~29 keV, an optical depth of 2.9 (spherical geometry) and a
temperature for the ``seed'' photons of 1.2 keV. Below 5 keV, there is a soft
excess which we fit with a blackbody of kTbb=0.7 keV. The Comptonization
temperature is significantly lower those observed for black holes candidates in
their low luminosity states (kTe >~ 50 keV). Finally, our observation allows us
to associate the presence of an hard tail with a low luminosity X-ray state
(1-20 keV luminosity of 10^37 erg/s at 7.7 kpc).

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The categories of this paper are: q-bio
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The categories of this paper are: hep-ex
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The categories of this paper are: gr-qc
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The categories of this paper are: math
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The categories of this paper are: q-fin
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The categories of this paper are: mtrl-th
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The categories of this paper are: adap-org
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The categories of this paper are: acc-phys
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The categories of this paper are: quant-ph
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The categories of this paper are: chem-ph
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The categories of this paper are: solv-int
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The categories of this paper are: ao-sci
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The categories of this paper are: plasm-ph
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The categories of this paper are: cmp-lg
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The categories of this paper are: atom-ph
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The categories of this paper are: nucl-ex