Cusped Mass Models of Gravitational Lenses

Muñoz, J. A.; Kochanek, C. S.; Keeton, C. R.
Referencia bibliográfica

The Astrophysical Journal, Volume 558, Issue 2, pp. 657-665.

Fecha de publicación:
9
2001
Número de autores
3
Número de autores del IAC
1
Número de citas
92
Número de citas referidas
76
Descripción
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.