Searches for Population III pair-instability supernovae: Impact of gravitational lensing magnification
Searches for Population III pair-instability supernovae: Impact of gravitational lensing magnification
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DOI：
10.1093/pasj/psz037
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发表时间：
2019-03
影响因子：
2.3
通讯作者：
Kenneth C. Wong;T. Moriya;M. Oguri;S. Hilbert;Y. Koyama;K. Nomoto
中科院分区：
文献类型：
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作者：
Kenneth C. Wong;T. Moriya;M. Oguri;S. Hilbert;Y. Koyama;K. Nomoto
超亮超新星被认为是由第三星族的祖先产生的，它们以对不稳定性超新星的形式爆炸。Pop III恒星是宇宙中的第一代恒星，被认为形成于$z \sim 6$。未来的近红外成像设施，如ULTIMATE斯巴鲁，可以通过专门的调查来检测和识别这些PISNe。通过宇宙中的介入结构的引力透镜可以通过将高z源群体放大到可检测性来帮助检测这些稀有物体。我们进行了模拟调查与ULTIMATE斯巴鲁，考虑到透镜的视线结构，以评估其对预测的检测率的影响。我们比较了LOS质量重建使用观测数据从超Suprime凸轮调查的结果从宇宙学模拟，以测试其一致性在计算宇宙中的放大率分布，以高$z$，但发现，基于数据的方法仍然是有限的，无法准确地表征结构超过$z\sim1.2 $。我们还评估了针对大质量星系团的调查策略，以利用其大面积的高放大率。我们发现，有针对性的集群可以导致在预测的检测到的PISNe在$z > 5$的数量的一个因素的$\sim$两个增益，甚至更高的增益与增加红移，给定我们假设的调查参数。对于z \sim 7-9$的最高红移源，空白场巡天将无法探测到任何源，而大质量星系团的透镜放大将是观察这个群体所必需的。
Superluminous supernovae have been proposed to arise from Population III progenitors that explode as pair-instability supernovae. Pop III stars are the first generation of stars in the Universe, and are thought to form as late as $z \sim 6$. Future near-infrared imaging facilities such as ULTIMATE-Subaru can potentially detect and identify these PISNe with a dedicated survey. Gravitational lensing by intervening structure in the Universe can aid in the detection of these rare objects by magnifying the high-$z$ source population into detectability. We perform a mock survey with ULTIMATE-Subaru, taking into account lensing by line-of-sight structure to evaluate its impact on the predicted detection rate. We compare a LOS mass reconstruction using observational data from the Hyper Suprime Cam survey to results from cosmological simulations to test their consistency in calculating the magnification distribution in the Universe to high-$z$, but find that the data-based method is still limited by an inability to accurately characterize structure beyond $z \sim1.2$. We also evaluate a survey strategy of targeting massive galaxy clusters to take advantage of their large areas of high magnification. We find that targeting clusters can result in a gain of a factor of $\sim$two in the predicted number of detected PISNe at $z > 5$, and even higher gains with increasing redshift, given our assumed survey parameters. For the highest-redshift sources at $z \sim 7-9$, blank field surveys will not detect any sources, and lensing magnification by massive clusters will be necessary to observe this population.