Cusped Mass Models of Gravitational Lenses
Cusped Mass Models of Gravitational Lenses
复制标题
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
中科院分区:
文献类型:
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作者:
J. A. Muñoz;C. S. Kochanek;C. Keeton
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.