GRB 080517：z=0.09的尘埃星系中的局部低光度GRB
GRB 080517: A local, low luminosity GRB in a dusty galaxy at z=0.09
摘要：
我们提出了一个分析的光度学和光谱学的宿主星系雨燕检测GRB 080517。从我们的光谱学，我们确定了红移z = 0.089 +/- 0.003，基于强发射线，使这成为一个非常局部的，低光度，长伽马射线暴的罕见例子。该星系的射电流量密度为S（4.8GHz）=0.22 +/- 0.04mJy，是已知的少数几个能安全测量射电流量的伽玛射线暴宿主之一。在22 μ m处的光发射线和强探测都表明，主星系正在快速形成恒星，推测恒星形成率约为16 Msun/年，尘埃遮蔽率很高（E（B-V）>1，基于星云发射区的视线）。在25千秒差距的投影距离内存在着一个伴星系，并且在红移上几乎相同，这表明恒星的形成可能是由星系与星系的相互作用引发的。然而，从紫外线到红外线的光谱能量分布非常平坦的拟合表明，一个更古老的，5亿年后的星爆恒星星族与正在进行的恒星形成一起存在。我们认为，GRB 080517的宿主星系是一个有价值的除了仍然非常小的样本，充分研究本地伽马射线暴主机。
英文摘要：
We present an analysis of the photometry and spectroscopy of the host galaxy of Swift-detected GRB 080517. From our optical spectroscopy, we identify a redshift of z = 0.089 +/- 0.003, based on strong emission lines, making this a rare example of a very local, low luminosity, long gamma ray burst. The galaxy is detected in the radio with a flux density of S(4.8GHz) =0.22 +/- 0.04mJy - one of relatively few known GRB hosts with a securely measured radio flux. Both optical emission lines and a strong detection at 22 um suggest that the host galaxy is forming stars rapidly, with an inferred star formation rate ~16 Msun/yr and a high dust obscuration (E(B-V )>1, based on sight-lines to the nebular emission regions). The presence of a companion galaxy within a projected distance of 25 kpc, and almost identical in redshift, suggests that star formation may have been triggered by galaxy-galaxy interaction. However, fitting of the remarkably flat spectral energy distribution from the ultraviolet through to the infrared suggests that an older, 500Myr post-starburst stellar population is present along with the ongoing star formation. We suggest that that the host galaxy of GRB 080517 is a valuable addition to the still very small sample of well-studied local gamma-ray burst hosts.
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