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Title:
Transient phenomena in anomalous X-ray pulsars and soft gamma -ray repeaters . The strongest magnets in the Universe
Authors:
Israel, G. L.
Affiliation:
AA(Istituto Nazionale di Astrofisica - Osservatorio Astronomico di Roma, Via Frascati 33, I-00040 Monte Porzio Catone, Italy - on behalf of a larger team (the complete list is reported in the acknowledgment section), )
Publication:
Memorie della Societa Astronomica Italiana, v.80, p.192 (2009)
Publication Date:
00/2009
Origin:
MmSAI
Keywords:
Pulsars, Magnetars, X-rays, Variability
Bibliographic Code:
2009MmSAI..80..192I

Abstract

In 2003 a previously unpulsed Einstein and ROSAT source cataloged as soft and dim (L_X of few ×1033erg s-1) thermal emitting object, namely XTE J1810-197, was identified as the first unambiguous transient Anomalous X-ray Pulsar. In September 2006 Swift Burst Alert Telescope (BAT) detected an intense burst from the candidate AXP CXOU J164710.2-455216, which entered in an outburst state reaching a peak emission of at least a factor of 300 higher than quiescence. In March 2006 Swift recorded a rare 30s-long sequence of short bursts and intermediate flares from SGR 1900+14. Here, we briefly outline the recent results concerning the transient phenomena observed in these magnetars. In particular, XTE J1810-197 and CXOU J164710.2-455216 have probed to be important laboratories to study the timing and spectral properties of the transient AXP class from outburst to quiescence, while new important information have been inferred from X-ray and radio band simultaneous observations of XTE J1810-197. For the first time ever, the Swift dataset of SGR 1900+14 allowed to test the magnetar prediction for the trapped fireball through time resolved spectroscopic study on timescales down to <10ms.
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