Changes between Version 383 and Version 384 of AstroTechTalk
- Timestamp:
- 29 Nov 2018, 12:04:21 (5 years ago)
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AstroTechTalk
v383 v384 36 36 || 30.11.2018 || || || 37 37 || '''07.12.2018 [[BR]](11hrs, MPIA Hoersaal)''' || '''Wolfgang Brandner''' || '''Surveying the galactic center of our Milky way with VLTI'''[[BR]][[BR]]Hidden behind dense dark clouds of dust and gas, and hence optically invisible, a super massive black hole populates the center of our Milky Way. Since September 2016 the interferometric instrument GRAVITY and the MPIA provided Coudé Infrared Adaptive Optics (CIAO) allow for the very first time the simultaneous interferometric observation of the galactic center with all four 8m telescopes of ESO's Very Large Telescope Interferometer (VLTI). Goal is to better understand the physical effects in this central region.[[BR]][[BR]]After a short introduction of interferometry with GRAVITY+CIAO, Wolfgang Brandner will give an overview of the observational results of the first two years at VLTI. The prime science cases were the tracking of a star during its passage at smallest distance to the galactic center and the investigation of brightness fluctuations at the closest proximity to the black hole. The motion of the star allows to determine the mass of the black hole and the distance to the sun with high precision. Furthermore, the measured data allow for a comparison with effects of Einstein's special and general theorie of relativity. The results indicate that Einstein's predictions are also valid in the direct vicinity of the super massive black hole in the center of our Milky Way.[[BR]][[BR]]Presentation: German[[BR]][https://svn.mpia.de/trac/gulli/att/raw-attachment/wiki/AlteVortraege2018S2/2018-12-07_GRAVITY_GR.pdf Slides: English][[BR]]Questions: German, English || 38 || 14.12.2018[[BR]](11hrs, HdA Auditorium) || Bernd Carsten Sander (ZARM) || Astronomical experiments with the drop-tower in Bremen||38 || '''14.12.2018[[BR]](11hrs, HdA Auditorium)''' || '''Bernd Carsten Sander (ZARM)''' || '''The Drop-Tower in Bremen - Weightless on Earth'''[[BR]][[BR]]The drop-tower in Bremen is a unique research facility in Europe, where everyday since 1990 scientific and technological experiments at zero gravity conditions are conducted. During the free fall from a height of 120m inside the tower, zero gravity is given for 4,74 seconds. Since 2004 a catapult-system allows to double this duration to 9,3 seconds. [[BR]][[BR]]The possible experiments span the complete range from knowledge-based and application-oriented fundamental research up to product design, especially in fluid mechanics, rheology, combustion and thermodynamics, as well as in material research, physics and biology. In addition, the proper functionality of spaceborne instruments is verified in this zero gravity environment before their nominal use in space.[[BR]][[BR]]Presentation: German[[BR]][https://svn.mpia.de/trac/gulli/att/raw-attachment/wiki/AlteVortraege2018S2/2018-12-14_BremerFallturm.pdf Slides: English][[BR]]Questions: German, English || 39 39 || 21.12.2018 || || || 40 40 || 28.12.2018 || -- || Christmas Break ||
