Please use this identifier to cite or link to this item:
Title: Pulse-phase-dependent variations of the Cyclotron absorption features of the accreting pulsars A0535+26, XTE J1946+274, and 4U 1907+09 with Suzaku
Authors: Maitra, Chandreyee
Paul, Biswajit
Keywords: pulsars: general
X-rays: binaries; X-rays:
individual (A0535+26
XTE J1946+274
Issue Date: 10-Jul-2013
Publisher: IOP Sciences for The American Astronomical Society
Citation: The Astrophysical Journal, 2013, Vol.771, p96
Abstract: We have performed a detailed pulse-phase-resolved spectral analysis of cyclotron resonant scattering features (CRSFs) of the two Be/X-ray pulsars A0535+26 and XTE J1946+274 and the wind accreting HMXB pulsar 4U 1907+09 using Suzaku observations. The CRSF parameters vary strongly over the pulse phase and can be used to map the magnetic field, and a possible deviation forms the dipole geometry in these sources. It also reflects the conditions at the accretion column and the local environment over the changing viewing angles. The pattern of variation with pulse phase is obtained with more than one continuum spectral model for each source, all of which give consistent results. Care is also taken in performing the analysis over a stretch of data having constant spectral characteristics and luminosity in order to ensure that the results reflect the variations due to the changing viewing angle alone. For A0535+26 and XTE J1946+274, which show energy-dependent dips in their pulse profiles, a partial covering absorber is added in the continuum spectral models to take into account an additional absorption at those phases by the accretion stream/column blocking our line of sight.
Description: Restricted Access. An open-access version is available at (one of the alternative locations)
ISSN: 0004-637X
Alternative Location:
Copyright: 2013 American Astronomical Society
Appears in Collections:Research Papers (A&A)

Files in This Item:
File Description SizeFormat 
  Restricted Access
Restricted Access1.76 MBAdobe PDFView/Open Request a copy

Items in RRI Digital Repository are protected by copyright, with all rights reserved, unless otherwise indicated.