伽玛暴的宿主星系I：十个邻近长持续时间GRB星系的ISM性质
The Host Galaxies of Gamma-Ray Bursts I: ISM Properties of Ten Nearby Long-Duration GRB Hosts
摘要：
我们首次对附近（z < 1）长持续时间伽马射线暴（LGRB）宿主星系进行了大尺度观测，其中包括在凯克和麦哲伦观测到的8个静止坐标系光谱。随着两个主机星系的观测文献中，我们使用光发射线诊断，以确定金属丰度，电离参数，年轻的恒星星族年龄，和恒星形成率。我们比较的LGRB宿主环境的各种本地和中等红移星系的人口，以及最新的网格的恒星星族合成和光电离模型产生的Starburst 99/映射代码。通过这些比较，我们研究了GRB宿主星系是否与一般星系群的性质一致，因此它们是否可以用作恒星形成的可靠示踪剂。我们发现，LGRB宿主星系一般具有低金属丰度ISM环境的z ~ 1。我们的伽玛暴宿主的ISM属性，包括金属丰度，电离参数和年轻的恒星星族年龄，显着不同于一般的星系人口，附近的宽线Ic型超新星的宿主星系，和附近的贫金属星系。
英文摘要：
We present the first observations from a large-scale survey of nearby (z < 1) long-duration gamma-ray burst (LGRB) host galaxies, which consist of eight rest-frame optical spectra obtained at Keck and Magellan. Along with two host galaxy observations from the literature, we use optical emission line diagnostics to determine metallicities, ionization parameters, young stellar population ages, and star formation rates. We compare the LGRB host environments to a variety of local and intermediate-redshift galaxy populations, as well as the newest grid of stellar population synthesis and photoionization models generated with the Starburst99/Mappings codes. With these comparisons we investigate whether the GRB host galaxies are consistent with the properties of the general galaxy population, and therefore whether they may be used as reliable tracers of star formation. We find that LGRB host galaxies generally have low-metallicity ISM environments out to z ~ 1. The ISM properties of our GRB hosts, including metallicity, ionization parameter, and young stellar population age, are significantly different from the general galaxy population, host galaxies of nearby broad-lined Type Ic supernovae, and nearby metal-poor galaxies.
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