Finite source effects in strong lensing: implications for the substructure mass scale
نویسندگان
چکیده
منابع مشابه
Finite Source Effects in Strong Lensing: Implications for the Substructure Mass Scale
Flux ratio ‘anomalies’ in quadruply-imaged gravitational lenses can be explained with galactic substructure of the sort predicted by ΛCDM, but the strength and uniqueness of that hypothesis needs to be further assessed. A good way to do that is to use the physical scale associated with the size of the source quasar, and its dependence on wavelength. We develop a toy model to study finite source...
متن کاملExtended Source Effects in Substructure Lensing
We investigate the extended source size effects on gravitational lensing in which a lens consists of a smooth potential and small mass clumps (“substructure lensing”). We first consider a lens model that consists of a clump modeled as a singular isothermal sphere (SIS) and a primary lens modeled as an external background shear and convergence. For this simple model, we derive analytic formulae ...
متن کاملStatistics of mass substructure from strong gravitational lensing: quantifying the mass fraction and mass function
ABSTRACT A Bayesian statistical formalism is developed to quantify the level at which the mass-function (dN/dm ∝ m−α) and the projected cumulative mass fraction ( f ) of (CDM) substructure in strong gravitational-lens galaxies, with arcs or Einstein rings, can be recovered as function of the lens-survey parameters and the detection threshold of the substructure mass. The method is applied to di...
متن کاملSimulations of Strong Gravitational Lensing with Substructure
Galactic sized gravitational lenses are simulated by combining a cosmological N-body simulation and models for the baryonic component of the galaxy. The lens caustics, critical curves, image locations and magnification ratios are calculated by ray-shooting on an adaptive grid. It is found that the simulations do not cause the observed number of violations of the cusp caustic magnification relat...
متن کاملStatistics of CDM substructure from strong gravitational lensing: quantifying the mass fraction and mass function
ABSTRACT A Bayesian statistical formalism is developed to quantify the level at which the mass-function parameters of (CDM) substructure in strong gravitational-lens galaxies can be recovered, as function of the lens-survey parameters and the detection threshold of the substructures mass. Results from multiple lenses are combined in order to constrain the substructure mass fraction ( f ) and th...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 2005
ISSN: 0035-8711,1365-2966
DOI: 10.1111/j.1365-2966.2005.09809.x