ar X iv : a st ro - p h / 99 11 23 8 v 1 1 3 N ov 1 99 9 MAGNETIC FIELD LIMIT ON SGR 1900 + 14
نویسندگان
چکیده
We measured the period and spin-down rate for SGR 1900+14 during the quiescient period two years before the recent interval of renewed burst activity. We have shown that the spin-down age of SGR 1900+14 is consistent with a braking index of ∼1 which is appropriate for wind torques and not magnetic dipole radiation. We have shown that a combination of dipole radiation, and wind luminosity, coupled with estimated ages and present spin parameters, imply that the magnetic field for SGR 1900+14 is less than 6×10 13 G and that the efficiency for conversion of wind luminosity to x-ray luminosity is <2%.
منابع مشابه
ar X iv : a st ro - p h / 99 04 24 4 v 1 1 9 A pr 1 99 9 Is SGR 1900 + 14 a Magnetar ?
We present RXTE observations of the soft gamma–ray repeater SGR
متن کاملar X iv : a st ro - p h / 99 04 24 4 v 2 3 J un 1 99 9 Is SGR 1900 + 14 a Magnetar ?
We present RXTE observations of the soft gamma–ray repeater SGR
متن کاملar X iv : a st ro - p h / 96 11 14 3 v 1 1 9 N ov 1 99 6 A high deuterium abundance in the early Universe
متن کامل
ar X iv : a st ro - p h / 99 11 43 8 v 1 2 3 N ov 1 99 9 H 2 molecules and cold clouds in cooling flow clusters †
متن کامل
ar X iv : a st ro - p h / 99 11 16 5 v 1 1 0 N ov 1 99 9 Turbulent dynamo action in the high – conductivity limit : a hidden dynamo
The paper deals with a simple spherical mean–field dynamo model of α 2 –type in the case of high electrical conductivity. A spherically symmetric distribution of turbulent motions is assumed inside a spherical fluid body surrounded by free space, and some complete form of the corresponding mean electromotive force is taken into account. For a turbulence lacking reflectional symmetry finite grow...
متن کامل