And the universeGamma rayThe explosion is similar. The cosmic X-ray explosion (referred to as the X-ray explosion for short) is also one of the major discoveries of astrophysics in the 1970s.Main points of the X burstfeaturesYes: the rise time of the explosion is ≤ 1s; the duration of the explosion is from a few seconds to tens of seconds; most of the energy is radiated in the range of less than 50 kiloelectron volts; the explosion occurs repeatedly, but there is no accurate period.Most explosive sources have explosive intervals ranging from a few hours to dozens of hours; some X explosive sources have explosive intervals ranging from a few seconds to a few minutes.Some people call the former type I X burst and the latter type II X burst.MXB1730-335 is a very strange source of X bursts, on which type I and type II X bursts can be observed at the same time.For most explosive sources, a relatively stable X-ray radiation was also observed between the two explosions.It is also found that when the stable radiation is in a high intensity state, there is no X burst; when it is in a low intensity state, there is an explosion.It is also found that most of the explosive sources, perhaps all of them, have a period of explosive activity and a period of quiet eruption. X eruption only occurs during the period of explosive activity.suchperiodIt lasts for weeks, months or years.The typical value of the maximum flow of the X burst measured on the ground is 10~10 ergs/(cm · s).If the distance of explosion source is 30000 light years, the maximum power of X explosion is 10~10 ergs/s.The observation shows that the energy spectrum of type I X bursts tends to soften, while that of type II X bursts does not.X explosion sources are distributed near the galactic plane.An X burst source has been found atGlobular clusterNGC6624.The nature, mechanism and radiation process of the X burst are not well studied.Some people think that the X burst originates from the nuclear reaction on the surface of the neutron star, and others think that the X burst is caused by the instability in the accretion process of the neutron star in the binary star[1]。
