用一个完整的LGRB样本对SLSN和LGRB宿主星系的比较进行评估
Taking stock of SLSN and LGRB host galaxy comparison using a complete sample of LGRBs
摘要：
长伽马射线暴（LGRB）和超亮超新星（SLSNe）都是大质量恒星的爆炸瞬变。通过调查发生这种瞬变的环境，可以找到关于祖细胞性质的线索。虽然对LGRB宿主星系的研究有着悠久的历史，但专门的观测活动直到最近才通过光度和光谱观察到足够多的SLSN宿主，以便对其属性进行统计显着分析。本文对贫氢SLSNe的宿主星系和雨燕/BAT 6的LGRB样品进行了比较。与以往的研究相比，我们使用了一个完整的样本的LGRB，我们解决了一个特别注意的比较方法和SLSN样本的选择，其数据已被编译从现有的文献。在中等红移（0.3 < z < 0.7），这两类瞬变选择的星系的性质（恒星质量、光度、恒星形成率、比恒星形成率和金属丰度）平均没有显著差异。此外，这两类天体的宿主星系都遵循基本金属丰度关系和金属丰度的基本平面。与以前的研究相比，我们发现，在中等红移的两个群体的发射线等效宽度基本上是相同的，以前的索赔关于更高的分数SLSN主机之间的极端发射线星系相对于LGRB主要是由于一个更大的分数SLSN主机之间的强线发射器在z < 0.3，LGRB主机的样本是小的，定义不明确。
英文摘要：
Long gamma-ray bursts (LGRBs) and superluminous supernovae (SLSNe) are both explosive transients with very massive progenitor stars. Clues about the nature of the progenitors can be found by investigating environments in which such transients occur. While studies of LGRB host galaxies have a long history, dedicated observational campaigns have only recently resulted in a high enough number of photometrically and spectroscopically observed SLSN hosts to allow statistically significant analysis of their properties. In this paper we make a comparison of the host galaxies of hydrogen-poor (H-poor) SLSNe and the Swift/BAT6 sample of LGRBs. In contrast to previous studies we use a complete sample of LGRBs and we address a special attention to the comparison methodology and the selection of SLSN sample whose data have been compiled from the available literature. At intermediate redshifts (0.3 < z < 0.7) the two classes of transients select galaxies whose properties (stellar mass, luminosity, star-formation rate, specific star-formation rate and metallicity) do not differ on average significantly. Moreover, the host galaxies of both classes of objects follow the fundamental metallicity relation and the fundamental plane of metallicity. In contrast to previous studies we show that at intermediate redshifts the emission line equivalent widths of the two populations are essentially the same and that the previous claims regarding the higher fraction of SLSN hosts among the extreme emission line galaxies with respect to LGRBs are mostly due to a larger fraction of strong-line emitters among SLSN hosts at z < 0.3, where samples of LGRB hosts are small and poorly defined.
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