NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
A Possible Magnetar Nature for IGR J16358-4726We 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 (P(sup(.)) = 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 disk accretion, we estimate that the source magnetic field ranges between 10(exp 13) and 10(exp 15) G, depending on its distance, possibly supporting a magnetar nature for IGR J16358-4726.
Document ID
20070019768
Acquisition Source
Marshall Space Flight Center
Document Type
Reprint (Version printed in journal)
Authors
Patel, S. K.
(NASA Marshall Space Flight Center Huntsville, AL, United States)
Zurita, J.
(INTEGRAL Science Data Center Versoix, Switzerland)
DelSanto, M.
(Laboratorio di Astrofisica Spaziale Rome, Italy)
Finger, M.
(Universities Space Research Association Huntsville, AL, United States)
Kouveliotou, 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.
(Universities Space Research Association Huntsville, AL, United States)
Walter, R.
(INTEGRAL Science Data Center Versoix, Switzerland)
Woods, P.
(Universities Space Research Association Huntsville, AL, United States)
Wilson, C. A.
(Laboratorio di Astrofisica Spaziale Rome, Italy)
Wachter, S.
(California Inst. of Tech. Pasadena, CA, United States)
Bazzano, A.
(Laboratorio di Astrofisica Spaziale Rome, Italy)
Date Acquired
August 23, 2013
Publication Date
March 10, 2007
Publication Information
Publication: The Astrophysical Journal
Volume: 657
Subject Category
Astronomy
Funding Number(s)
CONTRACT_GRANT: NNG04GH33G
CONTRACT_GRANT: DD3-4023X
CONTRACT_GRANT: I/R/046/04
Distribution Limits
Public
Copyright
Other

Available Downloads

There are no available downloads for this record.
No Preview Available