Cusped Mass Models of Gravitational Lenses

Cusped Mass Models of Gravitational Lenses
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引力透镜的尖点质量模型

DOI:
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发表时间:
2001
期刊:
影响因子:
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通讯作者:
C. Keeton
C. Keeton
中科院分区:
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文献类型:
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作者:
J. A. Muñoz;C. S. Kochanek;C. Keeton

文献摘要

被引文献

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最近对星系光度分布和暗物质模拟的观察发现,光度和质量分布的特征是中心尖点,而不是有限的核心半径。我们引入并实现了一组尖角椭球透镜模型,其中包括类似于 Jaffe、Hernquist、η 和 NFW 模型的限制,并将它们应用于引力透镜 APM 08279+5255 和 B1933+503。具有中心奇数图像的 APM 08279+5255 的成功模型需要非常浅的尖点,γ ≲ 0.4,其中 ρ ∝ r-γ 作为 r → 0,这类似于核心而不是受欢迎的 1 ≲ γ ≲ 2 尖点。相比之下,B1933+503 可以很好地建模,具有陡峭的密度尖点,1.6 ≲ γ ≲ 2.0。
Recent observations of galaxy luminosity profiles and dark matter simulations find luminosity and mass distributions characterized by central cusps rather than finite core radii. We introduce and implement a set of cusped ellipsoidal lens models that include limits similar to the Jaffe, Hernquist, η and NFW models and apply them to the gravitational lenses APM 08279+5255 and B1933+503. A successful model of APM 08279+5255 with its central, odd image requires a very shallow cusp, γ ≲ 0.4, where ρ ∝ r-γ as r → 0, which is similar to a core rather than the favored 1 ≲ γ ≲ 2 cusps. B1933+503, by contrast, is well modeled with a steep density cusp, 1.6 ≲ γ ≲ 2.0.