Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010head...11.1616k&link_type=abstract
American Astronomical Society, HEAD meeting #11, #16.16; Bulletin of the American Astronomical Society, Vol. 41, p.681
Astronomy and Astrophysics
Astronomy
Scientific paper
In 2008 October and in 2009 January and March, SGR J1550-5418 (previously known as AXP 1E 1547.0-5408) went into very active bursting episodes. The most intense episode was observed on 2009 January 22, during which Fermi/GBM recorded 450 soft gamma-ray bursts from the source. Using the GBM data during this intense bursting period, we identified an enhanced persistent emission that exhibited intriguing timing and spectral properties: (i) clear pulsations up to 110 keV at the spin period of the neutron star, (ii) an additional (to a power-law) blackbody component required for the enhanced emission spectrum with a temperature of 17 keV, and (iii) pulsed fraction that is strongly energy dependent and peaks in 50-74 keV. A total isotropic-equivalent energy emitted during this enhanced emission is estimated to be 1040 erg. We also estimate the area of the blackbody emitting region to be 0.4 km2 (roughly a few × 10-5 of the neutron star surface area): this small "hot spot" may correspond to the size of magnetically-confined hot plasma in the twisted magnetic field near the star's surface.
GBM Magnetar Team
Gogus Ersin
Granot Jonathan
Kaneko Yuki
Kouveliotou Chryssa
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