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Suzaku Observations of the Ultracompact Binary System 4U1626-67The accretion-powered pulsar 4U1626-67 experienced a new torque reversal at the beginning of 2008, after about 18 years of steadily spinning down. We present a spectral analysis of this source using two pointed observations performed by Suzaku in 2006 March and in 2010 September. We confirm with Suzaku the presence of a strong emission-line complex centered on 1 keV, with the strongest line being the hydrogen-like Ne Ly- alpha at 1.025(1.5) keV. We were able to resolve this complex with up to eight emission lines. A dramatic increase of the equivalent width of the Ne Ly-alpha 1.021 keV after the 2008 torque reversal occurred, reaching almost the same value measured by ASCA in 1993. In addition, we confirm the general decrease trend of the equivalent widths during the spin-down period. We also report on the detection of a cyclotron line feature centered at approx 37 keV. In spite of the fact that a dramatic increase of the X-ray luminosity (0.5-100 keV) of a factor of approx 3.5 occurred between these two observations, no significant change in the energy of the cyclotron line feature was observed. However, the intensity of the approx 1 keV line complex increased by an overall factor of approx 10.
Document ID
20120008470
Acquisition Source
Goddard Space Flight Center
Document Type
Preprint (Draft being sent to journal)
Authors
Camero-Arranz, A. (Universities Space Research Association Huntsville, AL, United States)
Pottschmidt, K. (Maryland Univ. Baltimore County Baltimore, MD, United States)
Finger, M. H. (Universities Space Research Association Huntsville, AL, United States)
Wilson-Hodge, C. A. (NASA Marshall Space Flight Center Huntsville, AL, United States)
Marcu, D. M. (Maryland Univ. Baltimore County Baltimore, MD, United States)
Date Acquired
August 25, 2013
Publication Date
November 18, 2011
Subject Category
Astronomy
Report/Patent Number
GSFC.JA.5907.2012
Funding Number(s)
CONTRACT_GRANT: NNX08AW06G
CONTRACT_GRANT: NNX10AJ48G
CONTRACT_GRANT: NNX11AE24G
CONTRACT_GRANT: NNG06EO90A
CONTRACT_GRANT: NNX11AD41G
Distribution Limits
Public
Copyright
Public Use Permitted.

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