Giannios 2007 中微子冷却吸积流作为伽玛暴的产生机制

主要内容:
考虑从径移主导吸积流朝中微子转变的时候产生的Poynting流作为产生伽玛暴的能源机制。可以解释流量－峰值频率的统计关系。

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文章信息:
Neutrino-cooled accretion and GRB variability

Authors: Dimitrios Giannios (Max Planck Institute for Astrophysics)

(Submitted on 12 Apr 2007)

Abstract: For accretion rates Mdot~0.1 Msun/s to a few solar mass black hole the inner part of the disk is expected to make a transition from advection dominance to neutrino cooling. This transition is characterized by sharp changes of the disk properties. I argue here that during this transition, a modest increase of the accretion rate leads to powerful enhancement of the Poynting luminosity of the GRB flow and decrease of its baryon loading. These changes of the characteristics of the GRB flow translate into changing gamma-ray spectra from the photosphere of the flow. The photospheric interpretation of the GRB emission explains the observed narrowing of GRB pulses with increasing photon energy and the luminosity-spectral peak relation within and among bursts.

Comments:

4 pages, 1 figure, submitted to A&A letters

Subjects:

Astrophysics (astro-ph)

Cite as:

arXiv:0704.1659v1 [astro-ph]