出版社：SISSA, Scuola Internazionale Superiore di Studi Avanzati
摘要：We studied an exceptional period of activity of the anomalous X-ray pulsar 1E 1547.0-5408 in January 2009, during which about 200 hard X-ray / soft g -ray bursts were detected by different instruments on board of ESA’s g -ray observatory INTEGRAL. Even though the source was outside the INTEGRAL instruments field of view during the major part of the outburst, we were able to study the statistical properties as well as spectral and timing characteristics of 84 short (100 ms−10 s) bursts from the source. We find that the luminosity of the 22 January 2009 bursts of 1E 1547.0-5408 was ¸ 1042 erg s−1 above » 80 keV, which is comparable to that of the bursts of soft gamma repeaters (SGR) and is at least two orders of magnitude larger than the luminosity of the previously reported bursts from AXPs. We identify various morphologies of the bursts. We find that the bursts of 1E 1547.0-5408 harden with increasing luminosity. Such a behavior is opposite of those observed in SGR bursts, but is similar to the hardness-luminosity relation observed in AXP 1E 2259+586. Our observations strengthens the conjecture that AXPs and SGRs are different representatives of one and the same source type.
