| タイトル | A Possible Magnetar Nature for IGR J16358-4726 |
| 著者（英） | Woods, P.; DelSanto, M.; Zurita, J.; Ubertini, P.; Eichler, D.; Koueliotou, C.; Walter, R.; Patel, S.; Gogus, E.; Finger, M. |
| 著者所属（英） | NASA Marshall Space Flight Center |
| 発行日 | 2006-05-22 |
| 言語 | eng |
| 内容記述 | 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 this transient outbursts can be occurring in intervals of at most 1 year. 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. We detected the 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 pulse spin up of 94 s (P = 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 disc accretion, we estimate that the source magnetic field ranges between 10(sup 13) approximately 10(sup 15) depending on its distance, possibly supporting a magnetar nature for IGR J16358-4726. |
| NASA分類 | Astronomy |
| 権利 | Copyright |
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