A Spatially Resolved Study of the GRB 020903 Host Galaxy
A Spatially Resolved Study of the GRB 020903 Host Galaxy
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DOI：
10.3847/1538-4357/aab093
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发表时间：
2017-07
期刊：
影响因子：
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通讯作者：
M. Thorp;E. Levesque
中科院分区：
文献类型：
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作者：
M. Thorp;E. Levesque
伽马暴020903是一次持续时间很长的伽马射线暴，其宿主星系距离足够近，范围足够大，可以进行空间分辨观测，使其成为可能进行此类宿主研究的不到12个伽马射线暴之一。伽马暴020903位于一个星系宿主复合体中，它似乎由四个相互作用的组件组成。在这里，我们给出了伽玛暴020903主星的空间分辨光谱观测结果。通过在两个不同的位置角度进行观测，我们能够获得银河系多个区域的光谱(3600-9000ä)。我们确认了与伽马射线暴020903相匹配的宿主星系的三个区域的红移。我们测量了这些区域的金属丰度，发现爆炸地点和附近的恒星形成区都具有类似的亚太阳金属丰度。我们的结论是，与过去对伽玛暴的空间分辨研究相一致，伽玛暴爆炸地点代表了整个宿主星系，而不是局限在该星系的贫金属区。
GRB 020903 is a long-duration gamma-ray burst with a host galaxy close enough and extended enough for spatially resolved observations, making it one of less than a dozen GRBs where such host studies are possible. GRB 020903 lies in a galaxy host complex that appears to consist of four interacting components. Here we present the results of spatially resolved spectroscopic observations of the GRB 020903 host. By taking observations at two different position angles, we were able to obtain optical spectra (3600–9000 Å) of multiple regions in the galaxy. We confirm redshifts for three regions of the host galaxy that match that of GRB 020903. We measure the metallicity of these regions, and find that the explosion site and the nearby star-forming regions both have comparable subsolar metallicities. We conclude that, in agreement with past spatially resolved studies of GRBs, the GRB explosion site is representative of the host galaxy as a whole rather than localized in a metal-poor region of the galaxy.