A possible magnetar nature for IGR J16358-4726
Patel, Sandeep K. and Zurita, J. and Del Santo, M. and Finger, Mark H. and Kouveliotou, Chryssa and Eichler, D. and Göğüş, Ersin and Ubertini, P. and Walter, R. and Woods, Peter M. and Wilson, Colleen A. and Wachter, S. and Bazzano, A. (2007) A possible magnetar nature for IGR J16358-4726. The Astrophysical journal, 657 (2). pp. 994-1003. ISSN 0004-637X
Official URL: http://dx.doi.org/10.1086/510374
We present detailed spectral and timing analysis of the hard X-ray transient IGR J16358-4726 using multisatellite archival observations. A study of the source flux time history over 6 yr suggests that lower luminosity transient outbursts can be occurring in intervals of at most 1 yr. 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 cutoff plus an Fe line. We detected the 1.6 hr 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 ( = 1.6 × 10-4), which strongly points to a neutron star nature for IGR J16358-4726. Assuming that the spin-up is due to disk accretion, we estimate that the source magnetic field ranges between 1013 and 1015 G, depending on its distance, possibly supporting a magnetar nature for IGR J16358-4726.
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