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arXiv 1301.6014astro-ph.HEastro-ph.CO
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诱导引力坍缩范例中的GRB 110709 B

GRB 110709B in the Induced Gravitational Collapse paradigm

Ana Virginia Penacchioni, Remo Ruffini, Carlo Luciano Bianco, Luca Izzo, Marco Muccino, Giovanni Battista Pisani, Jorge Armando Rueda

摘要:

上下文:GRB 110709 B是Swift BAT触发两次的第一个源,时间间隔约为10分钟。1)从1 °触发前的40秒到1 °触发后的60秒。第二个(EP。2)从2 °触发前的35秒到触发后的100秒。[...]在诱导引力坍缩(IGC)模型中,我们假设前身星是一个由演化恒星和中子星组成的密近双星系统。演化的恒星爆炸为超新星(SN)和部分被NS吸积的物质。我们把这个过程与EP。1.吸积过程使NS超过临界质量,从而引力坍缩成BH。这一过程导致γ射线暴辐射Ep。2. [...]目的:分析Ep的光谱和时间变异性。1和2并计算二元祖[...]在IGC范式中。方法:我们进行了时间分辨光谱分析的EP。1的黑体(BB)加上幂律(PL)光谱模型。我们分析了EP。2、在Fireshell模型中,识别真实伽玛暴(P-GRB),模拟光变曲线和光谱。我们确定红移为z = 0.75 [...]。结果:我们发现Ep.图1示出了PL随时间发生断裂后的BB温度,PL斜率分别在早期和晚期α = 0和β =-4 +/-2,并且在t = 41.21s处发生断裂。Ep的总能量。1和2分别为E_{iso} ^1 = 1.42 × 10 ^{53}尔格和E_{iso} ^2 = 2.43 × 10 ^{52}尔格。我们发现在透明情况下,洛伦兹因子Γ~173,实验室半径为6.04 × 10 ^{13} cm,P-GRB观测温度kT_{P-GRB} = 12.36keV,重子负荷B = 0.0057,P-GRB能量E_{P-GRB} = 3.44 × 10 ^{50} erg。[...]结论:我们将GRB 110709 B与GRB 970828、GRB 090618和GRB 101023一起解释为IGC来源的成员。在Ep. 2提供了一个前所未有的工具,以改善诊断的伽玛暴的排放。

英文摘要:

Context: GRB110709B is the first source for which Swift BAT triggered twice, with a time separation of ~10 min. The first emission (Ep. 1) goes from 40s before the 1° trigger up to 60s after it. The second (Ep. 2) goes from 35s before the 2° trigger to 100s after it.[...] Within the Induced Gravitational Collapse (IGC) model, we assume the progenitor to be a close binary system composed of a core of an evolved star and a Neutron Star (NS). The evolved star explodes as a Supernova (SN) and ejects material that is partially accreted by the NS. We identify this process with Ep. 1. The accretion process brings the NS over its critical mass, thus gravitationally collapsing to a BH. This process leads to the GRB emission, Ep. 2.[...] Aims: We analyze the spectra and time variability of Ep. 1 and 2 and compute the relevant parameters of the binary progenitor[...] in the IGC paradigm. Methods: We perform a time-resolved spectral analysis of Ep. 1 with a blackbody (BB) plus a power-law (PL) spectral model. We analyze Ep. 2 within the Fireshell model, identifying the Proper-GRB (P-GRB) and simulating the light curve and spectrum. We establish the redshift to be z=0.75 [...]. Results: We find for Ep. 1 a BB temperature following a broken PL with time, with the PL slopes at early and late times α=0 and β=-4+/-2, respectively, and a break at t=41.21s. The total energy of Ep. 1 and 2 are E_{iso}^1=1.42x10^{53}erg and E_{iso}^2=2.43x10^{52}erg, respectively. We find at transparency a Lorentz factor Γ~173, laboratory radius of 6.04x10^{13}cm, P-GRB observed temperature kT_{P-GRB}=12.36keV, baryon load B=0.0057 and P-GRB energy E_{P-GRB}=3.44x10^{50}erg. [...] Conclusions: We interpret GRB110709B as a member of the IGC sources, together with GRB970828, GRB090618 and GRB101023. The XRT data during Ep. 2 offers an unprecedented tool for improving the diagnostic of GRBs emission.

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