Quadruply-imaged quasars: some general features. (arXiv:2011.13142v2 [astro-ph.GA] UPDATED)

Quadruply-imaged quasars: some general features. (arXiv:2011.13142v2 [astro-ph.GA] UPDATED)
<a href="http://arxiv.org/find/astro-ph/1/au:+Tuan_Anh_P/0/1/0/all/0/1">P. Tuan-Anh</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Thai_T/0/1/0/all/0/1">T.T. Thai</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Tuan_N/0/1/0/all/0/1">N.A. Tuan</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Darriulat_P/0/1/0/all/0/1">P. Darriulat</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Diep_P/0/1/0/all/0/1">P.N. Diep</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Hoai_D/0/1/0/all/0/1">D.T. Hoai</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Ngoc_N/0/1/0/all/0/1">N.B. Ngoc</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Nhung_P/0/1/0/all/0/1">P.T. Nhung</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Phuong_N/0/1/0/all/0/1">N.T. Phuong</a>

Gravitational lensing of point sources located inside the lens caustic is
known to produce four images in a configuration closely related to the source
position. We study this relation in the particular case of a sample of
quadruply-imaged quasars observed by the Hubble Space Telescope (HST). Strong
correlations between the parameters defining the image configuration are
revealed. The relation between the image configuration and the source position
is studied. Some simple features of the selected data sample are exposed and
commented upon. In particular, evidence is found for the selected sample to be
biased in favour of large magnification systems. While having no direct impact
on practical analyses of specific systems, the results have pedagogical value
and deepen our understanding of the mechanism of gravitational lensing.

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