A possible magnetar nature for IGR J16358-4726

S. K. Patel, J. Zurita, M. Del Santo, M. Finger, C. Kouveuotou, D. Eichler, E. Göǧüş, P. Ubertini, R. Walter, P. Woods, C. A. Wilson, S. Wachter, A. Bazzano

Research output: Contribution to journalArticlepeer-review

24 Scopus citations


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 ACTS 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 (P = l.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.

Original languageEnglish
Pages (from-to)994-1003
Number of pages10
JournalAstrophysical Journal
Issue number2 I
StatePublished - 10 Mar 2007


  • Pulsars: individual (IGR J16358-4726)

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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