BEGIN:VCALENDAR VERSION:2.0 PRODID:-//ZContent.net//ZapCalLib 1.0//EN CALSCALE:GREGORIAN METHOD:PUBLISH BEGIN:VEVENT DTSTART;TZID=Atlantic/Canary:20221103T103000 DTEND;TZID=Atlantic/Canary:20221103T113000 UID:iactalks-1615 X-WR-CALNAME: IAC Talks: Open Astronomy Seminars X-ORIGINAL-URL: /iactalks/Talks/view/1615 CREATED:2022-11-03T10:30:00+00:00 X-WR-CALDESC: IAC Talks upcomming talks SUMMARY:Why and How Gaia DR3 is revolutionizing Galactic Astronomy DESCRIPTION:Why and How Gaia DR3 is revolutionizing Galactic Astronomy\nMin ia Manteiga\n\nAfter placing the Gaia mission in the context of current a strophysical research, the astrometric, photometric, and spectroscopic da ta provided by the satellite, as presented in its third data archive, DR3 , will be reviewed. Gaia third archive contains, in addition to the measu rements from the satellite's instruments, an extensive set of astrophysic al parameters derived by the DPAC data processing consortium, for stars, unresolved galaxies, and solar system objects. These parameters correspon d to about 1.8 billion sources repeatedly observed by the satellite duri ng the first 34 months of operation. In the case of the Milky Way stars, DR3 contains information for about 1% of its stars, which has made it pos sible, for the first time, to study the dynamics of the disk and the halo , and to reconstruct the tumultuous evolutionary history of our galaxy, w hich is etched in its halo. Studying the integrals of the motion and the orbital actions, some 15 episodes of accretion of other galaxies by our g alaxy have been identified, which shows that our Galaxy is the result of billions of years of "galactic canibalism". Accretion phenomena and tida l current trails are frequently observed in other galaxies and show that our Universe evolves through a hierarchical formation of galaxies.\n----- --------------------------------------------\nMeeting will be held online\ nYoutube: https://youtu.be/ns78Go3FM7I\nZoom: https://rediris.zo om.us/j/87455295473?pwd=dnd2SkppQ1F2UlN2K0FLbmlLZEFmZz09\nMeeting ID: 874 5529 5473\nPasscode: 941406 END:VEVENT END:VCALENDAR