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arXiv 0704.3069astro-ph
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GRB 050826:z = 0.296的亚发光事件在伽马射线暴余辉的亮度分布中找到了它的位置

GRB 050826: A Subluminous Event at z = 0.296 Finds its Place in the Luminosity Distribution of Gamma-Ray Burst Afterglows

N. Mirabal, J. P. Halpern, P. T. O'Brien

摘要:

我们提出了在红移z = 0.296 +/- 0.001的GRB 050826的宿主星系的光学识别和光谱。在连续三个晚上获得的观测结果之间的图像相减,揭示了爆发后5小时的褪色物体,确认其识别为该事件的光学余辉。深度成像显示,光学余辉从其不规则宿主星系中心偏移了0.4角秒(~1.76千秒差距),这是长时间伽马射线暴的典型特征。将这些结果与Swift XRT仪器获得的X射线测量结果相结合,我们发现GRB 050826完全落在低红移(z < 0.3)的亚发光、亚高能长伽马射线暴群中。结果进行了讨论的背景下,可能占这种趋势,包括中央引擎的性质,祖属性的红移函数的演变,并在当前的伽马射线暴样本的不完整性的模型。

英文摘要:

We present the optical identification and spectroscopy of the host galaxy of GRB 050826 at a redshift z = 0.296 +/- 0.001. Image subtraction among observations obtained on three consecutive nights, reveals a fading object 5 hours after the burst, confirming its identification as the optical afterglow of this event. Deep imaging shows that the optical afterglow is offset by 0.4 arcseconds (~1.76 kpc) from the center of its irregular host galaxy, which is typical for long-duration gamma-ray bursts. Combining these results with X-ray measurements acquired by the Swift XRT instrument, we find that GRB 050826 falls entirely within the subluminous, subenergetic group of long gamma-ray bursts at low redshift (z < 0.3). The results are discussed in the context of models that possibly account for this trend, including the nature of the central engine, the evolution of progenitor properties as a function of redshift, and incompleteness in current gamma-ray burst samples.

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