Time-delay quasars: scales and orders of magnitudes

Details Time-delay quasars: scales and orders of magnitudes Time-delay quasars: scales and orders of magnitudes

2003-10-23

arxiv.org/abs/astro-ph/0310686v1

Astron.Astrophys. 414 (2004) 425-428

Astronomy and Astrophysics

Astrophysics

To appear in A&A

Scientific paper

10.1051/0004-6361:20034184

We can think of a lensed quasar as taking the Hubble time, shrinking it by \~10^{-11}, and then presenting the result to us as a time delay; the shrinking factor is of the order of fractional sky-area that the lens occupies. This cute fact is a straightforward consequence of lensing theory, and enables a simple rescaling of time delays. Observed time delays have a 40-fold range, but after rescaling the range reduces to 5-fold. The latter range depends on details of the lens and lensing configuration--for example, quads have systematically shorter rescaled time delays than doubles--and is as expected from a simple model. The hypothesis that observed time-delay lenses all come from a generalized-isothermal family can be ruled out. But there is no indication of drastically different populations either.

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