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Understanding the nature of the intriguing source X Persei: A deep look with a Suzaku observation
KTH, Centres, Nordic Institute for Theoretical Physics NORDITA.
2017 (English)In: Monthly notices of the Royal Astronomical Society, ISSN 0035-8711, E-ISSN 1365-2966, Vol. 470, no 1, p. 713-722, article id stx1281Article in journal (Refereed) Published
Abstract [en]

We present detailed broad-band timing and spectral analysis of the persistent, low luminosity and slowly spinning pulsar X Persei using a deep Suzaku observation of the source. The spectrum is unusually hard with a cyclotron resonance scattering feature (CRSF), the presence of which has been debated. By comparing the spectral models relevant for accretion-powered pulsars, we have obtained the best constraint on the broad-band spectral model of X Persei obtained so far. The CRSF is not confirmed in the average spectrum.We have also identified the presence of different intensity levels in the source with distinct changes in the pulse profile and the energy spectrum indicating changes in the accretion geometry. We further find evidence of a CRSF in the highest intensity levels at ~40 keV, indicating a magnetic field strength of 3.4 × 1012 G.

Place, publisher, year, edition, pages
Oxford University Press, 2017. Vol. 470, no 1, p. 713-722, article id stx1281
Keyword [en]
Stars: neutron, X-rays: binaries, X-rays: individual: X Persei
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-212235DOI: 10.1093/mnras/stx1281ISI: 000406842600043Scopus ID: 2-s2.0-85021792065OAI: oai:DiVA.org:kth-212235DiVA, id: diva2:1134378
Note

QC 20170818

Available from: 2017-08-18 Created: 2017-08-18 Last updated: 2017-08-24Bibliographically approved

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