Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003arep...47..232m&link_type=abstract
Astronomy Reports, vol. 47, Issue 3, p.232-239
Astronomy and Astrophysics
Astronomy
6
Scientific paper
A new model is put forward to explain the observed features of anomalous X-ray pulsars (AXPs) and soft gamma-ray repeaters (SGRs). It is shown that drift waves can be excited in the magnetosphere of a neutron star with a rotational period of P˜0.1 s, surface magnetic field B s˜1012 G, and angle between the rotational axis and magnetic moment β<10°. These waves lead to the formation of radiation pulses with a period of P dr˜10 s. The rate of loss of rotational energy by such a star (˜1037 erg/s) is sufficient to produce the observed increase in the period , the X-ray luminosities of AXPs and SGRs (˜1034 1036 erg/s), and an injection of relativistic particles into the surrounding supernova remnant. A modulation of the constant component of the radiation with a period of P˜0.1 s is predicted. In order for SGRs to produce gamma-ray bursts, an additional source of energy must be invoked. Radio pulsars with periods of P obs>5 s can be described by the proposed model; in this case, their rotational periods are considerably less than P obs and the observed pulses are due to the drift waves.
Machabeli George Z.
Malofeev Valerii M.
Malov Igor F.
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