Discovery of MeV emission from a Magnetar, AXP 1E1547.0-5408, with Suzaku / Wide-band All-sky Monitor
Abstract
Magnetars are considered to be neutron stars with strong magnetic fields of 1013-14 Gauss. Although many high energy observations are performed on magnetars, the radiation process from them is still a mystery. Here, we report the first discovery of an MeV emission from a magnetar, named AXP 1E1547.0-5408, with the Wide-band All-sky Monitor (WAM) onboard Suzaku satellite, which has a huge effective area of 800 cm2 in the soft gamma-ray band. In 2009 January 22, the object became active and the WAM detected about 250 bursts in a day and successfully detected the X-ray emissions reaching 1 MeV from one of these bursts. The X-ray spectra obtained with the WAM were well reproduced by the power law model with a photon index of 2.7 and a soft black body component. The data does not require the cut-off or break in the 200 keV to 1.1 MeV range. In this presentation, we will show the detail of this discovery and discuss the importance of future collaborations with WAM and MAXI.
- Publication:
-
The First Year of MAXI: Monitoring Variable X-ray Sources
- Pub Date:
- December 2010
- Bibcode:
- 2010fym..confP..31Y