BeppoSAX observations of SGR 1900+ 14 in quiescence and during an active period

Abstract:

We present results from two BeppoSAX Narrow-Field Instrument observations of SGR 1900+ 14 made during a quiescent and an active period of the source. We detect pulsations in the 1997 May 12–13 observation (quiescence) at 5.157190 (7) s and the 1998 September 15–16 observation (active period) at 5.160261 (12) s. Using results recently reported by Hurley et al., we establish a long-term spin-down rate during quiescence of 5.82 (2)× 10 ss-1, which implies a dipole magnetic field of∼ 5.5× 10 G. We confirm deviations from a constant spin-down rate during the active period. We also find spectral similarities between SGR 1900+ 14 in quiescence and anomalous X-ray pulsars.

Año de publicación:

1999

Keywords:

Fuente:

google