Lensing degeneracies and mass substructure
نویسندگان
چکیده
منابع مشابه
Lensing Degeneracies Revisited
This paper shows that the mass-sheet degeneracy and other degeneracies in lensing have simple geometrical interpretations: they are mostly rescalings of the arrival-time surface. Different degeneracies appear in Local Group lensing and in cosmological lensing, because in the former the absolute magnification is measured but the image structure is not resolved, whereas in the latter the reverse ...
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...
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In recent years, gravitational lensing has been used as a means to detect substructure in galaxysized halos, via anomalous flux ratios in quadruply-imaged lenses. In addition to causing anomalous flux ratios, substructure may also perturb the positions of lensed images at observable levels. In this paper, we numerically investigate the scale of such astrometric perturbations using realistic mod...
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 کاملSubstructure in lensing clusters and simulations
We present high-resolution mass reconstructions for five massive cluster-lenses spanning a redshift range from z = 0.18–0.57 utilising archival Hubble Space Telescope (HST) data and applying galaxy-galaxy lensing techniques. These detailed mass models were obtained from the observations by combining constraints from the strong and weak lensing regimes. We ascribe local weak distortions in the s...
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ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 2012
ISSN: 0035-8711
DOI: 10.1111/j.1365-2966.2012.21751.x