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首页> 外文期刊>Astronomy and astrophysics >The afterglow and host galaxy of GRB?090205: evidence of a Ly-α emitter at z = 4.65
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The afterglow and host galaxy of GRB?090205: evidence of a Ly-α emitter at z = 4.65

机译：GRB？090205的余辉星系和宿主星系：z = 4.65时有Ly-α发射体的证据

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Context. Gamma-ray bursts (GRBs) have proven to be detectable to distances much larger than any other astrophysical object, providing the most effective way, complementing ordinary surveys of studying the high redshift universe. Aims. We present the results of an observational campaign devoted to the study of the high-z GRB?090205. Methods. We carried out optical/NIR spectroscopy and imaging of GRB?090205 with the ESO-VLT starting from hours after the event to several days later to detect the host galaxy. We compared the results obtained from our optical/NIR observations with the available Swift high-energy data of this burst. Results. Our observational campaign led to the detection of the optical afterglow and host galaxy of GRB?090205 and to the first measure of its redshift, z?=?4.65. As in other high-z GRBs, GRB?090205 has a short duration in the rest frame with T90,rf?=?1.6?s, which suggests that it might belong to the short GRB class. The X-ray afterglow of GRB?090205 has a complex and interesting behavior with a possible rebrightening at 500–1000?s from the trigger time and late flaring activity. Photometric observations of the GRB?090205 host galaxy imply that it is a starburst galaxy with a stellar population younger than ?~150?Myr. Moreover, the metallicity of Z?>?0.27Z⊙ derived from the GRB afterglow spectrum is among the highest derived from GRB afterglow measurement at high-z, suggesting that the burst occurred in a rather enriched environment. Finally, a detailed analysis of the afterglow spectrum shows the existence of a line corresponding to Lyman-α emission at the redshift of the burst. GRB?090205 is thus hosted by a typical Lyman-α emitter (LAE) at z?=?4.65. This makes the host galaxy of GRB?090205 the farthest GRB host galaxy, spectroscopically confirmed, detected to date.
机译：上下文。事实证明，伽玛射线爆发（GRB）的探测距离比任何其他天体物理物体都大得多，它提供了最有效的方法，补充了研究高红移宇宙的普通调查。目的我们提出了一项观测运动的结果，该运动专门用于研究高z GRB？090205。方法。我们从事件发生后数小时到几天后，使用ESO-VLT进行了GRB？090205的光学/ NIR光谱和成像，以检测宿主星系。我们将通过光学/近红外观测获得的结果与该爆发的可用Swift高能数据进行了比较。结果。我们的观察运动导致了对GRB？090205的光学余辉和宿主星系的检测，并导致了其红移的第一个量度z？=？4.65。与其他高z GRB一样，GRB？090205在其余帧中的持续时间较短，T90，rf？=？1.6？s，这表明它可能属于短GRB类。 GRB？090205的X射线余辉具有复杂而有趣的行为，可能在触发时间和后期起火活动后500-1000？s再次变亮。对GRB？090205宿主星系的光度观察表明，它是恒星爆发星系，其星体年龄小于～~ 150？Myr。另外，由GRB余辉光谱得到的Z 3＞≤0.27Z3的金属性是在高z下由GRB余辉测量得到的最高的金属性，这表明该爆裂发生在相当富集的环境中。最后，对余辉频谱的详细分析显示，在突发的红移处存在对应于Lyman-α发射的线。因此，GRB≥090205由典型的Lyman-α发射体（LAE）以z≥4.65承载。这使得GRB？090205的宿主星系成为迄今为止经光谱证实的最远的GRB宿主星系。

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