Pulse phase-coherent timing and spectroscopy of CXOU J164710.2−45521 outbursts

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Title: Pulse phase-coherent timing and spectroscopy of CXOU J164710.2−45521 outbursts
Authors: Rodríguez Castillo, Guillermo A. | Israel, Gian Luca | Esposito, Paolo | Pons, José A. | Rea, Nanda | Turolla, Roberto | Viganò, Daniele | Zane, Silvia
Research Group/s: Astrofísica Relativista
Center, Department or Service: Universidad de Alicante. Departamento de Física Aplicada
Keywords: Stars: individual: CXOU J164710.2−455216 | Stars: magnetars | Stars: neutron | X-rays: bursts
Knowledge Area: Astronomía y Astrofísica
Issue Date: 8-May-2014
Publisher: Oxford University Press
Citation: Monthly Notices of the Royal Astronomical Society. 2014, 441(2): 1305-1316. doi:10.1093/mnras/stu603
Abstract: We present a long-term phase-coherent timing analysis and pulse-phase resolved spectroscopy for the two outbursts observed from the transient anomalous X-ray pulsar CXOU J164710.2−455216. For the first outburst we used 11 Chandra and XMM–Newton observations between 2006 September and 2009 August, the longest baseline yet for this source. We obtain a coherent timing solution with P = 10.61065583(4) s, Ṗ = 9.72(1) × 10−13 s s−1 and P̈ = –1.05(5) × 10−20 s s−2. Under the standard assumptions this implies a surface dipolar magnetic field of ∼1014 G, confirming this source as a standard B magnetar. We also study the evolution of the pulse profile (shape, intensity and pulsed fraction) as a function of time and energy. Using the phase-coherent timing solution we perform a phase-resolved spectroscopy analysis, following the spectral evolution of pulse-phase features, which hints at the physical processes taking place on the star. The results are discussed from the perspective of magnetothermal evolution models and the untwisting magnetosphere model. Finally, we present similar analysis for the second, less intense, 2011 outburst. For the timing analysis we used Swift data together with 2 XMM–Newton and Chandra pointings. The results inferred for both outbursts are compared and briefly discussed in a more general framework.
Sponsor: DV was supported by the grants AYA 2010-21097-C03-02, ACOMP/2012/135, AYA 2012-39303 and SGR 2009-811. NR was supported by a Vidi NWO grant, Ramon y Cajal Fellowship, AYA 2012-39303 and SGR 2009-811.
URI: http://hdl.handle.net/10045/40567
ISSN: 0035-8711 (Print) | 1365-2966 (Online)
DOI: 10.1093/mnras/stu603
Language: eng
Type: info:eu-repo/semantics/article
Rights: © 2014 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society
Peer Review: si
Publisher version: http://dx.doi.org/10.1093/mnras/stu603
Appears in Collections:INV - Astrofísica Relativista - Artículos de Revistas

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