| 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 2ß16 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]]Nach einer kurzen Einführungen zur Interferometrie mit GRAVITY+CIAO wird Wolfgang Brandner einen Überblick über die Beobachtungsergebnisse der ersten beiden Jahre des Betriebs am VLTI geben. Schwerpunkt der Beobachtungen war die Verfolgung des nahen Vorübergangs eines Sterns um das galaktische Zentrum und die Untersuchung der Ursache von Helligkeitsausbrüchen in unmittelbarer Nähe des schwarzen Lochs. Aus der Bewegungen des Sterns lassen sich die Masse des schwarzen Lochs und dessen Entfernung zur Sonne mit hoher Genauigkeit bestimmen. Weiterhin können von Einsteins spezieller und allgemeiner Relativitätstheorie beschriebene Effekte gemessen und mit den Annahmen und Vorhersagen verglichen werden. Alle Ergebnisse deuten an, dass Einsteins Theorien auch in unmittelbare Nähe des supermassereichen schwarzen Lochs im Zentrum unserer Milchstraße ihre Gültigkeit behalten.[[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 || |
| | 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 || |
