The Radiation Properties Of Magnetars As The Central Energy For Gamma-ray Bursts

The gamma ray burst(GRB)is a star-scale,extremely dramatic explosion in the universe Since the era of Swift-Fermi satellite observation,gamma-ray burst has been a hot area of in astrophysics research.It is generally believed that the central engines of gamma-ray bursts be delineated into two types:a supra-massive black hole or a new-born millisecond magnetar,which drive the relativistic jets by consuming rotational energy or accretion,forming a jet that rapidly spreads out.The fast and slow shells collide with each other to form an internal shock during the epitaxial process,which generates corresponding prompt emission.The jet interacts with the interstellar medium/star wind to form an external shock,which produces multi-band afterglow.My work is mainly to report first-hand optical data and to explore the radiation mechanism of the millisecond magnetar center engine.This paper briefly introduces the related radiation mechanism of the new-born magnetar and its super accretion black hole central energy.The overall structure of the magnetar is described in detail for the internal structure of the magnetic star,My first gamma-ray observation example GRB 150910A,y-ray and X-ray simultaneously present an internal plateau,its optical R-band data from KAIT observation,the optical evolution behavior is consistent with the prediction of the standard external shock model.However,the early X-rays show internal plateau,and it is difficult to interpret with a standard forward shock model.It is necessary to consider with the long-lasting energy injection from magnetar central engine.The results of BAT and XRT,XRT-Optical joint spectrum indicate that the radiation of the internal plateau comes from the internal activity of the central engine,which may be derived from the of the magnetar.The energy injection process of from the magnetic wind.The optical radiation contribute to the external shock contribution,and the late light curve of the afterglow can be explained by the component of the thin shell of external shock model.Through the neutron star state equation,the range of magnetic field strength on the surface of the magnetar:1.02?Bp,15,?1.80 G;the range of the rotation period of the magnetar:1?Pp.15?1.77 m s.Due to the minimum lower limit of the rotation period,the radiation efficiency of magnetic dipole wind is greater than 32%.Both the rotation period and the surface magnetic field strength are within a reasonable range,and the lightcurve of GRB 150910A can be well explained with the evolution process of the new millisecond magnetar.We explored the x-ray internal plateau and a type of gamma-ray burst that followed the flare characteristics.We found that the x-ray flares was related to the collapse of the magnetar into a new-born black hole.If the center mass of the magnetar is too large or the rotation is slow,it can't maintain its own gravity to collapse into a black hole.The new-born black hole will accumulate part of the disintegrated material again.The material is accumulating to accelerate the rotation of the black hole,the light curve rises rapidly,and then the energy is released through the BZ mechanism.The black hole rotates slowly,and the light changes sharply after the peak,which is consistent with the light change of the flare.