منابع مشابه
Statistics of Quasars Multiply Imaged by Galaxy Clusters
We compute the expected number of quasars multiply imaged by cluster size dark halos for current wide field quasar surveys by carrying out a large ensemble of ray tracing simulations through clusters from a cosmological N-body simulation of the ΛCDM cosmology. Our calculation predicts ∼ 4 quasar lenses with splittings θ > 10 in the SDSS spectroscopic quasar sample, consistent with the recent di...
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With Gaia’s first data release comes a large amount of new data on stars in the Milky Way. We were interested in a subset of these that were cross referenced with the Tycho-2 catalogue. In this project, we look at two ways of analyzing the data spatial correlation functions and velocity profiles. To find a velocity profile, we looked at a subset of stars along the sun to galactic center line to...
متن کاملGaia Space Mission and Quasars
Quasars are often considered to be point-like objects. This is largely true and allows for an excellent alignment of the optical positional reference frame of the ongoing ESA mission Gaia with the International Celestial Reference Frame. But presence of optical jets in quasars can cause shifts of the optical photo-centers at levels detectable by Gaia. Similarly, motion of emitting blobs in the ...
متن کاملMicrolensing of multiply–imaged compact radio sources
We present the first unambiguous case of external variability of a radio gravitational lens, CLASS B1600+434. The Very Large Array (VLA) 8.5–GHz difference light curve of the lensed images, taking the proper time-delay into account, shows the presence of external variability with 14.6–σ confidence. We investigate two plausible causes of this external variability: scattering by the ionized compo...
متن کاملiPTF16geu: A multiply imaged, gravitationally lensed type Ia supernova.
We report the discovery of a multiply imaged, gravitationally lensed type Ia supernova, iPTF16geu (SN 2016geu), at redshift z = 0.409. This phenomenon was identified because the light from the stellar explosion was magnified more than 50 times by the curvature of space around matter in an intervening galaxy. We used high-spatial-resolution observations to resolve four images of the lensed super...
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ژورنال
عنوان ژورنال: Proceedings of the International Astronomical Union
سال: 2017
ISSN: 1743-9213,1743-9221
DOI: 10.1017/s1743921317006445