Gravitational Lens Time Delays Using Polarization Monitoring
نویسندگان
چکیده
منابع مشابه
Gravitational Lens Time Delays Using Polarization Monitoring
Gravitational lens time delays provide a means of measuring the expansion of the Universe at high redshift (and therefore in the ‘Hubble flow’) that is independent of local calibrations. It was hoped that many of the radio lenses found in the JVAS/CLASS survey would yield time delays as these were selected to have flat spectra and are dominated by multiple compact components. However, despite e...
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Using Fermat’s principle, we analyze the effects of very long wavelength gravitational waves upon the images of a gravitationally lensed quasar. We show that the lens equation in the presence of gravity waves is equivalent to that of a lens with different alignment between source, deflector, and observer in the absence of gravity waves. Contrary to a recent claim, we conclude that measurements ...
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Future large ensembles of time delay lenses have the potential to provide interesting cosmological constraints complementary to those of other methods. In a flat universe with constant w including a Planck prior, LSST time delay measurements for ∼ 4, 000 lenses should constrain h to ∼ 0.007 (∼ 1%), Ωde to ∼ 0.005, and w to ∼ 0.026 (all 1-σ precisions). Similar constraints could be obtained by a...
متن کاملWhat Do Gravitational Lens Time Delays Measure?
Gravitational lens time delays depend on the Hubble constant, the observed image positions, and the surface mass density of the lens in the annulus between the images. Simple time delay lenses like PG1115+080, SBS1520+530, B1600+434, PKS1830–211 and HE2149–2745 have H 0 = A(1 − κ) + Bκ(η − 1) where the two coefficients A ≃ 90 km/s Mpc and B ≃ 10 km/s Mpc depend on the measured delays and the ob...
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There are now 10 firm time delay measurements in gravitational lenses. The physics of time delays is well understood, and the only important variable for interpreting the time delays to determine H0 is the mean surface mass density 〈κ〉 (in units of the critical density for gravitational lensing) of the lens galaxy at the radius of the lensed images. More centrally concentrated mass distribution...
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ژورنال
عنوان ژورنال: Galaxies
سال: 2017
ISSN: 2075-4434
DOI: 10.3390/galaxies5040076