A Possible Magnetar Nature for IGR J16358-4726

Details A Possible Magnetar Nature for IGR J16358-4726 A Possible Magnetar Nature for IGR J16358-4726

2006-10-26

arxiv.org/abs/astro-ph/0610768v1

Astrophys.J.657:994-1003,2007

Astronomy and Astrophysics

Astrophysics

Accepted for publication in ApJ, 34 pgs, 14 figures, 4 tables

Scientific paper

10.1086/510374

We 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 lower luminosity transient outbursts can be occuring in intervals of at most 1 year. Joint spectral fits of the higher luminosity outburst using simultaneous Chandra/ACIS and INTEGRAL/ISGRI data reveal a spectrum well described by an absorbed power law model with a high energy cut-off plus an Fe line. We detected the 1.6 hour 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 spin up of 94 s (dP/dt = 1.6E-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 10^13 - 10^15 G, depending on its distance, possibly supporting a magnetar nature for IGR J16358-4726.

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