短GRB 130603 B余辉和基质的Gemini光谱
Gemini Spectroscopy of the Short GRB 130603B Afterglow and Host
摘要：
本文介绍雨燕卫星发现的明亮短时伽马射线暴GRB 130603 B的余辉和宿主星系的早期光度学和光谱学。使用双子座南望远镜，我们的提示光谱揭示了强烈的痕迹，从余辉叠加在连续谱和发射线从$z = 0.3568 \pm 0.0005$主星系。相对明亮的光学余辉（在$Δ_t $ = 8.4小时时r' = 21.52）与观测到的距宿主核0 \farcs 9的偏移（在z=0.3568时4.8kpc投影距离）的组合允许我们提取由余辉光主导的相对干净的光谱。空间分辨光谱使我们能够直接限制爆炸地点的属性，并将其与宿主星系核以及其他短持续时间GRB宿主星系进行比较。我们发现，而主机是一个相对明亮的（$L \approx 0.8 L^{*}_{B}$），恒星形成的星系与太阳的金属，余辉光谱表现出弱钙吸收功能，但可以忽略不计的发射功能。因此，爆炸地点缺乏最近恒星形成的证据，与紧凑的双星合并场景中预期的相对较长的延迟时间分布一致。恒星形成率（无论是在绝对意义上和归一化的光度）和金属的主机都与已知的样品短持续时间的伽玛射线暴主机和最近的结果表明GRB 130603 B的排放是产品的放射性物质的衰变过程中产生的合并过程中的NS-NS二进制（“千诺瓦”）是一致的。最终，发现更多类似于GRB 130603 B的事件以及8米级望远镜的快速跟踪将为我们了解致密天体双星系统的最后阶段提供新的机会。
英文摘要：
We present early optical photometry and spectroscopy of the afterglow and host galaxy of the bright short-duration gamma-ray burst GRB 130603B discovered by the Swift satellite. Using the Gemini South telescope, our prompt optical spectra reveal a strong trace from the afterglow superimposed on continuum and emission lines from the $z = 0.3568 \pm 0.0005$ host galaxy. The combination of a relatively bright optical afterglow (r' = 21.52 at $Δ_t $= 8.4hr), together with an observed offset of 0\farcs9 from the host nucleus (4.8kpc projected distance at z=0.3568), allow us to extract a relatively clean spectrum dominated by afterglow light . The spatially resolved spectrum allows us to constrain the properties of the explosion site directly, and compare these with the host galaxy nucleus, as well as other short-duration GRB host galaxies. We find that while the host is a relatively luminous ($L \approx 0.8 L^{*}_{B}$), star-forming galaxy with solar metallicity, the spectrum of the afterglow exhibits weak CaII absorption features but negligible emission features. The explosion site therefore lacks evidence of recent star formation, consistent with the relatively long delay time distribution expected in a compact binary merger scenario. The star formation rate (both in an absolute sense and normalized to the luminosity) and metallicity of the host are both consistent with the known sample of short-duration GRB hosts and with recent results which suggest GRB130603B emission to be the product of the decay of radioactive species produced during the merging process of a NS-NS binary ("kilonova"). Ultimately, the discovery of more events similar to GRB130603B and their rapid follow-up from 8-m class telescopes will open new opportunities for our understanding of the final stages of compact-objects binary systems.
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