A Swift Gaze In The Forest Of Sgr1900+14

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On March 2006 the Soft Gamma-ray Repeater SGR1900+14 resumed its bursting activity after about 3 years of quiescence. We report on the intense burst "forest" recorded on 2006 March 29 which lasted for about 30s, when Swift was pointing at the source with the narrow field of view instruments. More than 40 bursts were detected both by BAT and by XRT, seven of which are rare intermediate flares (IFs). The BAT data were used to carry out time-resolved spectroscopy in the 15-150keV range down to 8ms timescales. BAT and XRT simultaneous data (in the 1-150keV range) were instead used to characterize the integrated spectra of IFs.
This unique dataset allowed us to test the magnetically trapped fireball and the twisted magnetosphere predictions of the magnetar model over an unprecedented range of fluxes and with large statistics (in terms of both photons and IFs). We confirmed that a two blackbody component is the model best fitting the time-resolved and integrated spectra of IFs. Moreover, we found: i) a break, around 1041erg/s, above which the softer blackbody shows a sort of saturation while the harder one still grows to a few times 1041 erg/s; ii) the existence of a rather sharp correlation between temperature and radii of the blackbodies (R2 proportional to kT-3), which holds for the most luminous parts of the flares (approximately for Ltot > 1041erg/s). The majority of these findings can be accounted for in terms of thermalised emission from E-mode and O-mode photospheres. Interestingly, the maximum observed luminosity coming from a region of about 15km matches the magnetic Eddington luminosity at the same radius, for a surface dipole field of 8x10^14G (virtually equal to the one deduced from the spindown of SGR1900+14).

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