Non-parametric reconstruction of the galaxy lens in PG 1115 + 080
نویسندگان
چکیده
منابع مشابه
Non-parametric reconstruction of the galaxy-lens in PG1115+080
We describe a new, non-parametric, method for reconstructing lensing mass distributions in multiple-image systems, and apply it to PG1115+080, for which time delays have recently been measured. It turns out that the image positions and the ratio of time delays between different pairs of images constrain the mass distribution in a linear fashion. Since observational errors on image positions and...
متن کاملNon-parametric Reconstruction of the Galaxy-lens in Pg1115+080 Non-parametric Lens Models 1
We describe a new, non-parametric, method for reconstructing lensing mass distributions in multiple-image systems, and apply it to PG1115+080, for which time delays have recently been measured. It turns out that the image positions and the ratio of time delays between diierent pairs of images constrain the mass distribution in a linear fashion. Since observational errors on image positions and ...
متن کاملKeck Spectroscopy of the Gravitational Lens System PG 1115+080: Redshifts of the Lensing Galaxies
The quadruple system PG 1115+080 is the second gravitational lens with a reported measurement of the Hubble constant. In addition to the primary lens, three nearby galaxies are believed to contribute significantly to the lensing potential. In this letter we report accurate redshifts for all four galaxies and show that they belong to a single group at zd = 0.311. This group has very similar prop...
متن کاملSubstructures in lens galaxies : PG 1115 + 080 and B 1555 + 375 , two fold configurations
We study the anomalous flux ratio which is observed in some four-image lens systems, where the source lies close to a fold caustic. In this case two of the images are close to the critical curve and their flux ratio should be equal to unity, instead in several cases the observed value differs significantly. The most plausible solution is to invoke the presence of substructures, as for instance ...
متن کاملThe internal structure of the lens PG 1115 + 080 : breaking degeneracies in the value of the Hubble Constant
We combine lensing, stellar kinematic and mass-to-light ratio constraints to build a twocomponent (luminous plus dark) mass model of the early-type lens galaxy in PG1115+080. We find a total mass density profile steeper than r, effectively ρ ∝ r ′ with γ = 2.35± 0.1± 0.05 (random + systematic). The stellar mass fraction is f∗ = 0.67 +0.20 −0.25 ± 0.03 inside the Einstein Radius (RE≈1.2 effectiv...
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ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 1997
ISSN: 0035-8711,1365-2966
DOI: 10.1093/mnras/292.1.148