8-12 juin, 2014


Finding gravitational lenses, as well as very rapid intensity time variations, from the autocorrelation of intensity fluctuations.

Ermanno Borra (Université Laval)

Eric Trottier, Université Laval

We discuss the use of a novel technique that uses the autocorrelation of intensity fluctuations to detect milli and microlensing. It has major advantages for the study of gravitational lenses: Firstly, very short time delays (e.g. 10-7 seconds) as well as long time delays (e.g. hundreds of seconds) can be detected with a single observation lasting an hour. Secondly the detection of the time-delay signature unambiguously identifies the lensing event. The techniques currently used to study milli and microlensing necessitate observations of luminosity variations over very long times (weeks or months). The autocorrelation technique can also find very rapid (e.g. 10-6seconds) periodic intensity variations. We will present early results of an analysis of radio-astronomical data that we are presently carrying out.
(doit être confirmé par le SOC)