适用于椭圆星系与盘星系的统一线性内禀取向模型及其产生的椭率谱
A unified linear intrinsic alignment model for elliptical and disc galaxies and the resulting ellipticity spectra
AI总结：
本文提出统一椭圆星系与盘星系的线性内禀取向模型，推导其角椭率谱，并评估其物理性质及在类 Euclid 弱透镜巡天中的污染与可观测性。
摘要：
旋涡星系的取向曾被认为源于潮汐力矩作用，即宇宙大尺度结构的潮汐场对暗物质晕施加扭转力矩，决定其角动量并最终决定星系盘的朝向。在该模型中，由此产生的内禀椭率相关性通常存在于小尺度上，但观测和模拟均未发现经验证据；相反，模拟表明盘星系的取向可能遵循与椭圆星系相似的取向模型，只是取向幅度更弱。本文论证了由星系盘潮汐畸变产生线性取向的理论，研究了该模型的物理性质，并推导了由此产生的角椭率谱——它们将作为弱引力透镜信号的一项贡献出现在 Euclid 等巡天中。我们详细讨论了盘星系中潮汐诱导取向的统计与物理性质（这些性质与缓解弱透镜数据中的取向污染相关），评述了旋涡星系与椭圆星系取向幅度之间的一致性，并最终估计了利用类 Euclid 巡天观测它们的可行性。
英文摘要：
Alignments of spiral galaxies were thought to result from tidal torquing, where tidal field of the cosmic large-scale structure exert torquing moments onto dark matter haloes, determining their angular momentum and ultimately the orientation of galactic discs. In this model, resulting intrinsic ellipticity correlations are typically present on small scales, but neither observations nor simulations have found empirical evidence; instead, simulations point at the possibility that alignments of disc galaxies follow a similar alignment model as elliptical galaxies, but with a weaker alignment amplitude. In our article we make the case for the theory of linear alignments resulting from tidal distortions of the galactic disc, investigate the physical properties of this model and derive the resulting angular ellipticity spectra, as they would appear as a contribution to weak gravitational lensing in surveys such as Euclid's. We discuss in detail on the statistical and physical properties of tidally induced alignments in disc galaxies, as they are relevant for mitigation of alignment contamination in weak lensing data, comment on the consistency between the alignment amplitude in spiral and elliptical galaxies and finally, estimate their observability with an Euclid-like survey.
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