arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0803.4100astro-ph
收藏

GRB 060923 A的极端红色余辉:距离还是尘埃?

The extreme, red afterglow of GRB 060923A: Distance or dust?

N. R. Tanvir, A. J. Levan, E. Rol, R. L. C. Starling, J. Gorosabel, R. S. Priddey, D. Malesani, P. Jakobsson, P. T. O'Brien, A. O. Jaunsen, J. Hjorth, J. P. U. … 展开作者

N. R. Tanvir, A. J. Levan, E. Rol, R. L. C. Starling, J. Gorosabel, R. S. Priddey, D. Malesani, P. Jakobsson, P. T. O'Brien, A. O. Jaunsen, J. Hjorth, J. P. U. Fynbo, A. Melandri, A. Gomboc, B. Milvang-Jensen, A. S. Fruchter, M. Jarvis, C. A. C. Fernandes, T. Wold

摘要:

伽马射线暴是早期宇宙的有力探测器,但定位和识别非常遥远的伽玛射线暴仍然具有挑战性。我们在这里报告发现雨燕GRB 060923A的K波段余辉,这是在爆发后第一个小时内拍摄的,也是迄今为止发现的最暗的余辉。它在任何更蓝的波段都没有探测到,使其成为一个候选的非常高的红移爆发(z>11)。然而,我们后来的光学成像和光谱学揭示了一个与GRB位置一致的暗淡星系,如果它是宿主,则意味着更温和的红移(最有可能z<2.8),因此尘埃可能是非常红色的余辉颜色的原因。在这种情况下,它是迄今为止发现的少数几个具有高尘埃消光的伽玛射线暴余辉的例子之一。

英文摘要:

Gamma-ray bursts are powerful probes of the early universe, but locating and identifying very distant GRBs remains challenging. We report here the discovery of the K-band afterglow of Swift GRB 060923A, imaged within the first hour post-burst, and the faintest so far found. It was not detected in any bluer bands to deep limits, making it a candidate very high redshift burst (z>11). However, our later-time optical imaging and spectroscopy reveal a faint galaxy coincident with the GRB position which, if it is the host, implies a more moderate redshift (most likely z<2.8) and therefore that dust is the likely cause of the very red afterglow colour. This being the case, it is one of the few instances so far found of a GRB afterglow with high dust extinction.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑