Mathematics – Logic
Scientific paper
Jul 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004iaus..220..141y&link_type=abstract
International Astronomical Union Symposium no. 220, held 21 - 25 July, 2003 in Sydney, Australia. Eds: S. D. Ryder, D. J. Pisano
Mathematics
Logic
Scientific paper
We investigate methods to detect numerous CDM substructures around galaxies predicted by cosmological N-body simulations via medium-scale gravitational-lens effect. Magnification anomaly due to such substructures have already been noted by some researchers and applied to gravitationally lensed quasars. In this presentation we focus on other phenomena produced by gravitational lens effects multiple images and the time delays between images at the same situation i.e. the lens is a galaxy and the source is a distant quasar. Here we have included the effect of the galaxy itself so-called ""Chang-Refsdal lens"" situation and estimated image separations and the time delays. The expected values are from 1 to 100 mas for the image separation and from 10 to 1000 sec for the time delay with slight lens model dependence. Event rate for such phenomena is the order of percent but such signals in one image of a gravitationally lensed quasar must be a direct evidence for the numerous CDM substructures. Image separations and time delays are reflect mass of the lens and our methods will provide better constraints on the substructres compared with magnification anomaly.
Susa Hajime
Umemura Masayuki
Yonehara Atsunori
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