Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The INTEGRAL View of the Galactic Nucleus   We present the preliminary results of the observational campaign performed in
2003 to study the Galactic Nucleus with INTEGRAL. The mosaicked images obtained
with the IBIS/ISGRI coded aperture instrument in the energy range above 20 keV,
give a yet unseen view of the high-energy sources of this region in hard X and
gamma-rays, with an angular resolution of 12'. We report on the discovery of a
source, IGR J17456-2901, compatible with the instrument's point spread function
and coincident with the Galactic Nucleus Sgr A* to within 0.9'. The source is
visible up to 60-80 keV with a 20-100 keV luminosity at 8 kpc of 3 x 10E35
erg/s. Although we cannot unequivocally associate the new INTEGRAL source to
the Galactic Nucleus, this is the first report of significant hard X-ray
emission from within the inner 10' of the Galaxy and a contribution from the
galactic center supermassive black hole itself cannot be excluded. Here we
discuss the results obtained and the perspectives for future observations of
the Galactic Nucleus with INTEGRAL and other observatories

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The categories of this paper are: math-ph
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The categories of this paper are: alg-geom
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The categories of this paper are: stat
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The categories of this paper are: atom-ph
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The categories of this paper are: econ
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The categories of this paper are: nucl-th
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The categories of this paper are: mtrl-th
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The categories of this paper are: nlin
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The categories of this paper are: q-bio
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The categories of this paper are: comp-gas
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The categories of this paper are: cs
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The categories of this paper are: plasm-ph
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The categories of this paper are: eess
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The categories of this paper are: hep-ph
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The categories of this paper are: acc-phys
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The categories of this paper are: hep-lat