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

Sep 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006head....9.0155p&link_type=abstract

American Astronomical Society, HEAD meeting #9, #1.55; Bulletin of the American Astronomical Society, Vol. 38, p.338

Astronomy and Astrophysics

Astronomy

1

Scientific paper

We present a detailed spectral and timing analysis of the hard x-ray transient IGR J16358-4726 using multi-satellite archival observations. 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. A study of the source flux time history over 6 years, suggests that transient outbursts can be occuring in intervals of at most 1 year. 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 1e13-1e15 G, depending on its distance, possibly supporting a magnetar nature for IGR J16358-4726.

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