Cluster-Cluster Microlensing as a Probe of Intracluster Stars, MACHOs, and Remnants of the First-Generation Stars
Cluster-Cluster Microlensing as a Probe of Intracluster Stars, MACHOs, and Remnants of the First-Generation Stars
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星团-星团微透镜作为星团内恒星、MACHO 和第一代恒星遗迹的探测器
DOI：
10.1086/346205
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发表时间：
2002
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通讯作者：
T. Totani
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作者：
T. Totani
最近发现一个阿贝尔星团 A2152 正在与另一个距离更远的星团形成一个星团-星团系统，该星团的核心几乎与 A2152 的核心完全对齐。我们讨论了微透镜事件的可探测性，其中 A2152 后面的源星团中的一颗恒星被 A2152 中的星团内致密天体极大地放大。我们表明，使用具有宽视场的 8 m 级望远镜（例如 Subaru/Suprime-Cam）进行搜索，可以探测质量范围 mco ~ 10-5 至 1010 M☉ 的星团内致密天体，包括尚未受到任何过去观测限制的范围。我们预计事件发生率比前景簇 (A2152) 更有偏差，这将是微透镜的独特特征，使该实验特别强大。该实验对致密天体质量分数的灵敏度为星团总暗物质的 1%-10%，这对于 mco 来说大致恒定，对于大型望远镜来说有合理的望远镜时间（约 10 晚）。因此，在此质量范围内的任何致密物体都可以被检测或拒绝作为暗物质的主要成分。正如银河系光晕的 MACHO 合作所声称的那样，如果 20% 的星团质量是 M ~ 1 M☉ 的致密天体，预计会发生大约 10 次事件。其他可能可探测到的目标包括因星系相互作用而剥离的星团内恒星，以及作为第一代恒星残余物产生的假设的非常大质量黑洞（M ≳ 100 M☉），这可能是最近报道的过量宇宙红外背景辐射的原因，而这似乎无法用正常银河光来解释。
An Abell cluster, A2152, was recently found to be forming a cluster-cluster system with another, more distant cluster whose core is almost perfectly aligned with that of A2152. We discuss the detectability of microlensing events where a single star in the source cluster behind A2152 is extremely magnified by an intracluster compact object in A2152. We show that a search with an 8 m class telescope with a wide field of view, such as the Subaru/Suprime-Cam, can probe intracluster compact objects with a wide mass range of mco ~ 10-5 to 1010 M☉, including ranges that have not yet been constrained by any past observations. We expect that the event rate is more biased than the foreground cluster (A2152), which would be a unique signature of microlensing, making this experiment particularly powerful. The sensitivity of this experiment for the mass fraction of compact objects would be 1%-10% in the total dark matter of the cluster, which is roughly constant against mco, with a reasonable telescope time for large telescopes (~10 nights). Therefore, any compact objects in this mass range can be detected or rejected as the dominant component of the dark matter. About 10 events are expected if 20% of the cluster mass is in a form of compact objects with M ~ 1 M☉, as claimed by the MACHO collaboration for the Milky Way halo. Other possibly detectable targets include intracluster stars stripped by galaxy interactions, and hypothetical very massive black holes (M ≳ 100 M☉) produced as remnants of the first-generation stars, which might be responsible for the recently reported excess of the cosmic infrared background radiation that seems impossible to explain by normal galactic light.
影响因子：
8.6
作者：
P. Wilkinson;D. R. Henstock;I. Browne;A. Polatidis;P. Augusto;A. Readhead;T. Pearson;W. Xu;G. Taylor;R. U. O. Manchester;Jodrell Bank Observatory;O. Observatory;Universidade da Madeira;C. I. O. Technology.;National Radio Astronomy Observatory;Netherlands Foundation for Radioastronomy
通讯作者：
P. Wilkinson;D. R. Henstock;I. Browne;A. Polatidis;P. Augusto;A. Readhead;T. Pearson;W. Xu;G. Taylor;R. U. O. Manchester;Jodrell Bank Observatory;O. Observatory;Universidade da Madeira;C. I. O. Technology.;National Radio Astronomy Observatory;Netherlands Foundation for Radioastronomy
T.Totani 等人：“弥散河外背景光与斯巴鲁深场中的深部星系计数：宇宙中缺失的光？”Astrop.J.Letters (2001)
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