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Paper: Towards Direct Detection of Substructure around Galaxies -- Quasar Mesolensing
Volume: 289, The Proceedings of the IAU 8th Asian-Pacific Regional Meeting, Volume I
Page: 469
Authors: Yonehara, A.; Umemura, M.; Susa, H.
Abstract: We discuss about detectability of substructure around galaxies by utilizing a quasar which is gravitationally lensed by an intervening galaxy. In this situation, background quasars have already shown multiple images. If a substructure in the lens galaxy is superposed on one of the images, additional gravitational lensing by the substructure will occur. The typical image separation due to the substructures with mass 10^8 M_o is on the order of micro-arcseconds. Even if we cannot resolve these images, the total flux variations of these images are expected to be observed, both as its own flux variation plus the ``echo"-like variation due to time delay between the images. The time delay of this ``echo"-like variation is estimated to be several tens of minutes.
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