Speaker
Description
The last years have seen a revolution in Optical/Infrared Interferometry. The GRAVITY instrument at the VLTI is now routinely providing milli-arcsecond resolution imaging and micro-arcsecond astrometry, for objects which are order of magnitudes fainter than what has been possible before. In our presentation we give an overview of the GRAVITY discoveries in Galactic Center Black Hole and Active Galactic Nuclei (AGN). Among others we will present the tests of Einstein's theory of general relativity and its underlying principles from precise stellar orbit measurement, and the discovery of highly relativistic, circular motion of hot gas close to the innermost circular orbit around SgrA. Especially the time resolved astrometry and the polarization measurements of the flaring SgrA shed new light on the mechanisms driving the accretion / outflow of black holes. We further present some of the GRAVITY results on AGNs, including the image of the hot dust around NGC 1068, the sizes and structure for a first sample of AGNs, and the spatially resolved rotation of the broadline region (BLR) of quasars. We will round of the talk by reporting on the ongoing upgrades and plans towards GRAVITY+ all sky milli arcsecond optical interferometric imaging.
| Abstract type | RU or CN Highlight Talk (please discuss with Coordinators before) |
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