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Title: Torque reversals and pulse profile of the pulsar 4U 1626-67
Authors: Beri, Aru
Jain, Chetana
Paul, Biswajit
Raichur, Harsha
Keywords: accretion discs
Issue Date: 1-Apr-2014
Publisher: Oxford University Press
Citation: Monthly Notices of the Royal Astronomical Society, 2014, Vol. 439, p1940-1947
Abstract: We review the pulse profile evolution of the unique accretion powered X-ray pulsar 4U 1626−67 over the last 40 yr since its discovery. This pulsar showed two distinct eras of steady spin-up separated by a steady spin-down episode for about 18 yr. In this work, using data from different observatories active during each phase of spin-up and spin-down, we establish a clear correlation between the accretion torque acting on this pulsar and its pulse profile. The energy-resolved pulse profiles are identical in both the spin-up eras and quite different in the spin-down era, especially in the low-energy band. This correlation, along with the already known feature of strong quasi-periodic oscillations (QPO) that was present only in the spin-down era, clearly establishes two different accretion modes on to the neutron star which produce different pulse profiles and only one of which produces the QPOs.
Description: Open Access
ISSN: 0035-8711
1365-2966 - (online)
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Copyright: 2014 The authors & the Royal Astronomical Society.
Appears in Collections:Research Papers (A&A)

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