Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: INTEGRAL and Swift/XRT observations of IGR J19405-3016   IGR J19405-3016 is reported in the 3rd IBIS catalog as being one of its
lowest significance sources (~4.6 sigma under an exposure of about 371 ks).
This leads to a caveat in multi-wavelength study although the source was
identified in optical as a Seyfert 1. The currently increased INTEGRAL data
stimulate us to investigate the reality of this source. We analyze all
available observations carried out by INTEGRAL and Swift on IGR J19405-3016. We
find that IGR J19405-3016 has a detection significance of ~ 9.4 sigma in the
20-60 keV band during the observational period between March 2003 and March
2008. Thus confirms a real source detection reported previously. The source
position and error location are therefore updated. The source is found to be
constant over years at the hard X-rays. Over the three XRT observations, the
source flux varied by up to 39% from the average, and the spectrum is generally
soft. The combined XRT/ISGRI spectrum is well fitted with a simple power law
model (photon index 2.11+-0.03). Such a photon index is well consistent with
the mean value 1.98 (dispersion 0.27) as obtained from Swift/BAT AGN samples at
14-195 keV. The spectral slope of IGR J19405-3016 is larger than the average
spectral slope found by Molina et al. (2009). A similar discrepancy is found
with the results of Beckmann et al. (2009) regarding Seyfert 1 AGNs. A possible
explanation of this simple spectral description may be that the low level of
the column density allows for the `true' spectrum to appear at soft X-rays as
well.

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The categories of this paper are: ao-sci
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The categories of this paper are: adap-org
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The categories of this paper are: hep-lat
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The categories of this paper are: q-alg
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The categories of this paper are: nucl-th
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The categories of this paper are: supr-con
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The categories of this paper are: atom-ph
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The categories of this paper are: q-fin
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The categories of this paper are: nlin
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The categories of this paper are: dg-ga
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The categories of this paper are: nucl-ex
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The categories of this paper are: quant-ph
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The categories of this paper are: mtrl-th
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The categories of this paper are: hep-th
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The categories of this paper are: econ
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The categories of this paper are: cmp-lg