منابع مشابه
The 2dF gravitational lens survey
The 2 degree Field (2dF) galaxy redshift survey will involve obtaining spectra of approximately 2.5 × 10 objects which have previously been identified as galaxy candidates on morphological grounds. Included in these spectra should be about ten gravitationally-lensed quasars, all with low-redshift galaxies as deflectors (as the more common lenses with highredshift deflectors will be rejected fro...
متن کاملGravitational lens time delays and gravitational waves.
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 ...
متن کاملGravitational Lens Mg
We report the discovery of a new gravitationally lensed radio source. Radio maps of MG 0751+2716 show four lensed images, which, at higher resolution, are resolved into long arcs of emission. A group of galaxies is present in optical images, including the principal lensing galaxy, with a much brighter galaxy just a few arcseconds away. We have measured the redshift of this brighter galaxy. No o...
متن کاملRotating Gravitational Lens ?
It is known that the rotation of a gravitational lens affects properties of images. We consider an inverse problem: If the lens is dark, can we infer its rotation from the observed images? We find that, up to the first order in the gravitational constant G, a rotating lens is not distinguishable from a non-rotating one. The quadrupole contribution to the deflection angle is also calculated for ...
متن کاملThe Hubble Constant from the Gravitational Lens
We present a refined gravitational lens model of the four-image lens system B1608+656 based on new and improved observational constraints: (i) the three independent time-delays and flux-ratios from Very Large Array (VLA) observations, (ii) the radio-image positions from Very Large Baseline Array (VLBA) observations, (iii) the shape of the deconvolved Einstein Ring from optical and infrared Hubb...
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ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 1964
ISSN: 0035-8711,1365-2966
DOI: 10.1093/mnras/128.4.295