Investigating Pulse Morphology in GX 1+4

Publications of the Astronomical Society of Australia

Michelle C. Storey¹ 

[1] J. G. Greenhill

关键词: radiation mechanism: non-thermal;    pulsars: individual(GX 1+4);    X-rays: stars;   

DOI  :  10.1071/AS98217

学科分类：天文学(综合)

来源: CSIRO

【 摘 要 】

Observational and theoretical evidence points to the existence of an unusually high magnetic field on GX 1+4. The pulsar is thus an ideal laboratory for studying two-photon cyclotron emission, an important source of photons of frequency significantly less than the cyclotron frequency in X-ray pulsars. Low-frequency approximations to the two-photon cyclotron emission transition probabilities are derived. These are used to calculate the theoretical opening angle of the double-humped pulse shape predicted by the two-photon cyclotron emission model. The theoretical pulse shape, incorporating the effects of gravitational light bending, is compared with observations of GX 1+4. Observed light curves have opening angles consistent with the theoretically predicted maximum value.

【 授权许可】

Unknown