20 hours ago
Saturday, February 18, 2017
Announcement: The Science Circle Presents “Measuring the Universe With Digital Surveys”
When: Saturday, February 18th
Time: 10 AM PST
In Voice and Text chat
By Giuseppe Longo
A large part of what we know about the cosmos comes from what the astronomers call “surveys”, i.e the imaging of large portion of the sky conducted in a systematic fashion and when possible in multiple colors. Survey astronomy requires dedicated telescopes finely tuned to cover a large field of view and large detectors capable to capture several square degrees of the sky at once.
In the past these surveys consisted mainly in huge archives of photographic plates which had to be visually inspected and analysed. Nowadays, large field digital detectors allow to acquire and store the information in digital form and this has caused a true revolution in field. The huge volume of data produced by an average survey is so large to make impossible for a single researcher or group of researchers to exploit all the scientific applications of the data and therefore data become immediately or almost immediately public thus allowing a large, worldwide community to access first quality data. The talk will try to outline these and other aspects of survey astronomy.