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A Possible Magnetar Nature for IGR J16358-4726We present detailed spectral and timing analysis of the hard x-ray transient IGR J16358-4726 using multi-satellite archival observations. A study of the source flux time history over 6 years, suggests that this transient outbursts can be occurring in intervals of at most 1 year. Joint spectral fits using simultaneous Chandra/ACIS and INTEGRAL/ISGRI data reveal a spectrum well described by an absorbed cut-off power law model plus an Fe line. We detected the pulsations initially reported using Chandra/ACIS also in the INTEGRAL/ISGRI light curve and in subsequent XMM-Newton observations. Using the INTEGRAL data we identified a pulse spin up of 94 s (P = 1.6 x 10(exp -4), which strongly points to a neutron star nature for IGR J16358-4726. Assuming that the spin up is due to disc accretion, we estimate that the source magnetic field ranges between 10(sup 13) approximately 10(sup 15) depending on its distance, possibly supporting a magnetar nature for IGR J16358-4726.
Document ID
20060025551
Acquisition Source
Marshall Space Flight Center
Document Type
Preprint (Draft being sent to journal)
Authors
Patel, S.
(NASA Marshall Space Flight Center Huntsville, AL, United States)
Zurita, J.
(INTEGRAL Science Data Center Versoix, Switzerland)
DelSanto, M.
(Istituto di Astrofisica Spaziale e Fisica cosmica Rome, Italy)
Finger, M.
(Universities Space Research Association Huntsville, AL, United States)
Koueliotou, C.
(NASA Marshall Space Flight Center Huntsville, AL, United States)
Eichler, D.
(Ben Gurion Univ. of the Negev Beersheva, Israel)
Gogus, E.
(Sabanci Univ. Istanbul, Turkey)
Ubertini, P.
(Istituto di Astrofisica Spaziale e Fisica cosmica Rome, Italy)
Walter, R.
(INTEGRAL Science Data Center Versoix, Switzerland)
Woods, P.
(Universities Space Research Association Huntsville, AL, United States)
Date Acquired
August 23, 2013
Publication Date
May 22, 2006
Subject Category
Astronomy
Distribution Limits
Public
Copyright
Other

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