The dynamic behavior of soft gamma repeaters
نویسندگان
چکیده
منابع مشابه
The Dynamic Behavior of Soft Gamma Repeaters
Soft Gamma Repeaters (SGRs) undergo changes in their pulse properties and persistent emission during episodes of intense burst activity. Both SGR 1900+14 and SGR 1806−20 have shown significant changes in their spin-down rates during the last several years, yet the bulk of this variability is not correlated with burst activity. SGR 1900+14 has undergone large changes in flux and a dramatic pulse...
متن کاملSoft gamma repeaters outside the Local Group
We propose that the best sites to search for Soft Gamma Repeaters (SGRs) outside the Local Group are the galaxies with active massive-star formation. Different possibilities to observe SGR activity from these sites are discussed. In particular, we have searched for giant flares from the nearby galaxies (∼ 2 – 4 Mpc away) M82, M83, NGC 253, and NGC 4945 in the BATSE data. No candidate giant SGR ...
متن کاملEnergy Sources of Soft Gamma-Ray Repeaters
Quiescence and burst emission and relativistic particle winds of soft gamma-ray repeaters (SGRs) have been widely interpreted to result from ultrastrongly magnetized neutron stars. In this magnetar model, the magnetic energy and gravitational energy of the neutron stars are suggested as the energy sources of all the emission and winds. However, Harding, Contopoulos & Kazanas (1999) have shown t...
متن کاملObservation of Soft Gamma Repeaters with BeppoSAX
In this paper I will briefly review what are, in my view, the main contributions of BeppoSAX to the understanding of the class of sources known as Soft Gamma Repeater. These enigmatic sources were firmly identified as steady pulsars just during the operating lifetime of BeppoSAX. All the instruments onboard BeppoSAX have at some level contributed in this field with specific observations, always...
متن کاملJCMT observations of Soft Gamma-Ray Repeaters
The spectra of the quiescent counterparts to the Soft Gamma-Ray Repeaters SGR 1900+14 and SGR 1806–20 peak in the infrared. Their infrared spectra appear to contain several components: the photospheric emission from star(s) dominates at shorter wavelengths, a bright point source dominates at 25 μm, while an extended source dominates at 60 μm. However, we show here that these counterparts were n...
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ژورنال
عنوان ژورنال: Advances in Space Research
سال: 2004
ISSN: 0273-1177
DOI: 10.1016/j.asr.2003.04.022