Pantheon SEMPARIS Le serveur des séminaires parisiens Paris

Status Confirmed
Seminar Series APC-COLLOQUIUM
Subjects astro-ph
Date Friday 26 October 2018
Time 11:00
Institute APC
Seminar Room 454A
Speaker's Last Name Stebbins
Speaker's First Name Albert
Speaker's Email Address
Speaker's Institution Fermilab
Title Spectroscopic Count Intensity Interferometry with Extremely Large Telescopes
Abstract Title: Optical Intensity Interferometry (Hanbury Brown Twiss) is an astronomical imaging technique that was used to make the first direct measurement of stellar diameters. The technique was abandoned in favor of amplitude interferometry decades ago, however amplitude interferometry is not practical for very long baselines which limits its angular resolution. Two modern technical developments, the construction of three 30 meter telescopes and extremely fast (picosecond) photon counters, should cause a revival of Intensity Interferometry. This will allow (crude) optical imaging with nano-arcsecond resolution. Targets to be imaged include not only stars but also supermassive black holes at cosmological distances and micro-quasars in our Galaxy as well as time dependent phenomena such as kilonovae and the Crab optical pulsar.
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