Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Broad-band spectral evolution and temporal variability of IGR
  J17091-3624 during its 2016 outburst : SWIFT and NuSTAR results   We report on the 2016 outburst of the transient Galactic Black Hole candidate
IGR J17091-3624 based on the observation campaign carried out with SWIFT and
NuSTAR. The outburst profile, as observed with SWIFT-XRT, shows a typical
`q'-shape in the Hardness Intensity Diagram (HID). Based on the spectral and
temporal evolution of the different parameters, we are able to identify all the
spectral states in the q-profile of HID and the Hardness-RMS diagram (HRD).
Both XRT and NuSTAR observations show an evolution of low frequency Quasi
periodic oscillations (QPOs) during the low hard and hard intermediate states
of the outburst rising phase. We also find mHz QPOs along- with distinct
coherent class variabilities (heartbeat oscillations) with different
timescales, similar to the $\rho$-class (observed in GRS 1915+105).
Phenomenological modelling of the broad-band XRT and NuSTAR spectra also
reveals the evolution of high energy cut-off and presence of reflection from
ionized material during the rising phase of the outburst. Further, we conduct
the modelling of X-ray spectra of SWIFT and NuSTAR in 0.5 - 79 keV to
understand the accretion flow dynamics based on two component flow model. From
this modelling, we constrain the mass of the source to be in the range of 10.62
- 12.33 Msun with 90% confidence, which is consistent with earlier findings.

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The categories of this paper are: cond-mat
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The categories of this paper are: atom-ph
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The categories of this paper are: physics
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The categories of this paper are: mtrl-th
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The categories of this paper are: supr-con
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The categories of this paper are: adap-org
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The categories of this paper are: patt-sol
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The categories of this paper are: stat
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The categories of this paper are: cmp-lg
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The categories of this paper are: eess
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The categories of this paper are: quant-ph
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The categories of this paper are: hep-lat
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The categories of this paper are: comp-gas
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The categories of this paper are: hep-ph
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The categories of this paper are: q-bio
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The categories of this paper are: q-alg