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arXiv 1104.3290astro-ph.HE
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Swift J164449 .3+573451事件:在坍缩星团中产生?

Swift J164449.3+573451 event: generation in the collapsing star cluster?

V. I. Dokuchaev, Yu. N. Eroshenko

摘要:

我们讨论了坍缩星系核模型中的多带能量释放,并试图在这种情况下解释独特的超长宇宙伽马射线事件Swift J164449.3+573451(GRB 110328A早期分类)。中子星和恒星质量的黑洞可以在银河系中心演化形成一个紧凑的自引力子系统。这些恒星残骸在簇核雪崩收缩和坍缩过程中的碰撞和合并,由于几种机制,可以在不同的波段产生强大的事件。中子星与恒星质量黑洞的碰撞可以产生类似于短伽玛暴起源的普通模型的伽马射线暴(GRB)。最初两天的明亮峰值也可能是多重物质供应(由于碰撞中的物质释放)和吸积到形成中的超大质量黑洞上的结果。引力透镜效应、气体在超大质量黑洞上的后期吸积,以及激波对粒子的加速,都会产生许多较小的峰值和后来的准稳态辐射。即使这个模型在未来的观测中不能完全重现斯威夫特J164449.3+573451的所有性质,这种星系核的坍缩也可以在其他事件中被探测到。

英文摘要:

We discuss the multiband energy release in a model of a collapsing galactic nucleus, and we try to interpret the unique super-long cosmic gamma-ray event Swift J164449.3+573451 (GRB 110328A by early classification) in this scenario. Neutron stars and stellar-mass black holes can form evolutionary a compact self-gravitating subsystem in the galactic center. Collisions and merges of these stellar remnants during an avalanche contraction and collapse of the cluster core can produce powerful events in different bands due to several mechanisms. Collisions of neutron stars and stellar-mass black holes can generate gamma-ray bursts (GRBs) similar to the ordinary models of short GRB origin. The bright peaks during the first two days may also be a consequence of multiple matter supply (due to matter release in the collisions) and accretion onto the forming supermassive black hole. Numerous smaller peaks and later quasi-steady radiation can arise from gravitational lensing, late accretion of gas onto the supermassive black hole, and from particle acceleration by shock waves. Even if this model will not reproduce exactly all the Swift J164449.3+573451 properties in future observations, such collapses of galactic nuclei can be available for detection in other events.

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