GAMMA RAY BURST IS A MISSING RING OF DARK MATTER IN EXTENDED HALO(Massive Astrophysical Compact Halo Objects)

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We suggest that soft gamma ray repeater(SGR) fill up a missing ring between the double neutron star(NS) systems and high mass X-ray binaries(HMXBs). Processes of the planet formation after supernova(SN) explosion of C-O star in the close binary, inducing episodic accretions onto a NS as the activities of SGR, are investigated. We also consider the possibilty that these stellar systems become the dark matter in the extended halo of our galaxy. The matter ejection from the system due to SN explosion induces the high peculiar velocity of this system ≃ 10^3kms^<-1>. Some ejecta are trapped to form a disk around a companion old NS. Planetesimals with typical mass ≃ 10^<21>g are formed at 10^<12>cm. The planet formation can trigger activities of SGR after the migration time t_<mig> ≃ 10yr. These systems with high velocity can disperse in the extended halo. If these HMXB systems are formed in dense spheroidal systems at the galaxy forming phase, there are more than 10^7 old neutron stars and planets in the extened halo (≃ 100kpc). We believe that these old neutron stars become gamma ray bursts and these planets are observed as MACHOs.
素粒子論グループ素粒子研究編集部の論文
1995-09-20