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Broad-band spectral evolution and temporal variability of IGR J17091-3624 during its 2016 outburst: SWIFT and NuSTAR results
Dayananda Sagar Univ, Dept Phys, Bangalore 560068, Karnataka, India..
ISRO Satellite Ctr, Space Astron Grp, SSIF ISITE Campus,Outer Ring Rd, Bangalore 560037, Karnataka, India.;Indian Inst Sci, Bangalore 560012, Karnataka, India..
ISRO Satellite Ctr, Space Astron Grp, SSIF ISITE Campus,Outer Ring Rd, Bangalore 560037, Karnataka, India..
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics. Albanova Univ Ctr, KTH PAP, S-10691 Stockholm, Sweden..
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2018 (English)In: Astrophysics and Space Science, ISSN 0004-640X, E-ISSN 1572-946X, Vol. 363, no 9, article id 189Article in journal (Refereed) Published
Abstract [en]

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 -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 with 90% confidence, which is consistent with earlier findings.

Place, publisher, year, edition, pages
Springer, 2018. Vol. 363, no 9, article id 189
Keywords [en]
Accretion, accretion disks, Black hole physics, X-rays: binaries, ISM: jets and outflows, Stars: individual: IGR J17091-3624
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:kth:diva-234580DOI: 10.1007/s10509-018-3411-1ISI: 000442478500001Scopus ID: 2-s2.0-85052240883OAI: oai:DiVA.org:kth-234580DiVA, id: diva2:1248764
Note

QC 20180917

Available from: 2018-09-17 Created: 2018-09-17 Last updated: 2018-09-17Bibliographically approved

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Iyer, Nirmal

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