Dec 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004cfa..colle..31k&link_type=abstract
CfA Colloquium Lecture Series Talk
Physics
Scientific paper
Magnetars (Soft Gamma Repeaters and Anomalous X-ray Pulsars) are a subclass of neutron stars characterized by their recurrent X-ray bursts. While in an active (bursting) state, they are emitting hundreds of predominantly soft (kT=30 keV), short (0.1-100 ms long) events. Active states last anywhere between days and years. Their quiescent source X-ray light curves exhibit pulsations in the narrow range of 5-11 s; estimates of these rotational period rate changes (spin-down) indicate that their magnetic fields are extremely high, of the order of10^14-10^15 G. Such high B-field objects, dubbed "magnetars", had been predicted to exist in 1992, but the first concrete observational evidence was obtained in 1998 for two of these sources. Recent developments have shown that these sources can switch from active bursting states to long periods of quiescence, indicating that there maybe many thousands of them in our Galaxy that are not detectable. I will discuss here the history of magnetars, and their spectral, timing and flux characteristics both in the persistent and their burst emission.
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