Time-delay quasars: scales and orders of magnitudes

Дата и время публикации : 2003-10-23T15:15:29Z

Авторы публикации и институты :
Prasenjit Saha (QMW, Univ London and Obs Strasbourg)

Оригинал статьи :http://arxiv.org/abs/astro-ph/0310686v1

Скачать pdf : http://arxiv.org/pdf/astro-ph/0310686v1

Ссылка на журнал-издание: Astron.Astrophys. 414 (2004) 425-428
Коментарии к статье: To appear in A&A
Первичная категория: astro-ph

Все категории : astro-ph

Краткий обзор статьи: 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.

Category: Physics