SKA的强引力透镜效应
Strong gravitational lensing with the SKA
摘要：
强引力透镜提供了一个重要的工具来测量遥远宇宙中的质量，从而测试星系形成和暗物质的模型;研究再电离时代的结构;测量哈勃常数和可能作为红移函数的w。然而，所有这些研究的限制因素是目前已知引力透镜的样本量很小（~10^2）。SKA时代将通过引力透镜改变我们对宇宙的理解，特别是在无线电波段，已知的引力透镜数量将增加到约10^5个。本文讨论了利用SKA进行强引力透镜观测的技术要求、预期结果和主要科学目标。我们发现，全天空（3 π sr）进行调查与SKA 1-MID阵列的角分辨率为0.25-0.5角秒和深度为3微焦/束是需要的星系形成和宇宙学的研究与引力透镜。此外，SKA 1的VLBI能力还需要用于暗物质的测试和利用引力透镜研究高红移的超大质量黑洞。
英文摘要：
Strong gravitational lenses provide an important tool to measure masses in the distant Universe, thus testing models for galaxy formation and dark matter; to investigate structure at the Epoch of Reionization; and to measure the Hubble constant and possibly w as a function of redshift. However, the limiting factor in all of these studies has been the currently small samples of known gravitational lenses (~10^2). The era of the SKA will transform our understanding of the Universe with gravitational lensing, particularly at radio wavelengths where the number of known gravitational lenses will increase to ~10^5. Here we discuss the technical requirements, expected outcomes and main scientific goals of a survey for strong gravitational lensing with the SKA. We find that an all-sky (3pi sr) survey carried out with the SKA1-MID array at an angular resolution of 0.25-0.5 arcsec and to a depth of 3 microJy / beam is required for studies of galaxy formation and cosmology with gravitational lensing. In addition, the capability to carryout VLBI with the SKA1 is required for tests of dark matter and studies of supermassive black holes at high redshift to be made using gravitational lensing.
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