Sub-MeV band observation of a hard burst from AXP 1E 1547.0-5408 with the Suzaku Wide-band All-sky Monitor
Abstract
The 2.1-s anomalous X-ray pulsar 1E 1547.0-5408 exhibited an X-ray outburst on 2009 January 22, emitting a large number of short bursts. The wide-band all-sky monitor (WAM) on-board Suzaku detected at least 254 bursts in the 160 keV-6.2 MeV band over the period of January 22 00:57-17:02 UT from the direction of 1E 1547.0-5408. One of these bursts, which occurred at 06:45:13, produced the brightest fluence in the 0.5-6.2 MeV range, with an averaged 0.16-6.2 MeV flux and extrapolated 25 keV-2 MeV fluence of about 1 × 10-5 erg cm-2 s-1 and about 3 × 10-4 erg cm-2, respectively. After pile-up corrections, the time-resolved WAM spectra of this burst were well-fitted in the 0.16-6.2 MeV range by two-component models; specifically, a blackbody plus an optically thin thermal bremsstrahlung or a combination of a blackbody and a power-law component with an exponential cut-off. These results are compared with previous works reporting the persistent emission and weaker short bursts followed by the same outburst.
- Publication:
-
Publications of the Astronomical Society of Japan
- Pub Date:
- June 2015
- DOI:
- 10.1093/pasj/psv011
- arXiv:
- arXiv:1502.04819
- Bibcode:
- 2015PASJ...67...41Y
- Keywords:
-
- stars: magnetars;
- X-rays: bursts;
- X-rays: individual (AXP 1E 1547.0-5408;
- SGR J1550-5418;
- PSR J1550-5418);
- Astrophysics - High Energy Astrophysical Phenomena
- E-Print:
- 20 pages, 10 figures, 1 table, PASJ, accepted