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The two states of Sgr A* in the near-infrared: bright episodic flares on top of low-level continuous variability
K. Dodds-Eden, S. Gillessen, T. K. Fritz +11
In this paper we examine properties of the variable source Sgr A* in the near-infrared (NIR) using a very extensive Ks-band data set from NACO/VLT observations taken 2004 to 2009.…
The Fringe Detection Laser Metrology for the GRAVITY Interferometer at the VLTI
H. Bartko, S. Gillessen, S. Rabien +19
Interferometric measurements of optical path length differences of stars over large baselines can deliver extremely accurate astrometric data. The interferometer GRAVITY will simul…
GRAVITY: a four-telescope beam combiner instrument for the VLTI
S. Gillessen, F. Eisenhauer, G. Perrin +60
GRAVITY is an adaptive optics assisted Beam Combiner for the second generation VLTI instrumentation. The instrument will provide high-precision narrow-angle astrometry and phase-re…
GC-IRS13E - A puzzling association of three early-type stars
Tobias K. Fritz, Stefan Gillessen, Katie Dodds-Eden +9
We present a detailed analysis of high resolution near-infrared imaging and spectroscopy of the potential star cluster IRS13E very close to the massive black hole in the Galactic C…
Flares from Sgr A* and their emission mechanism
K. Dodds-Eden, D. Porquet, G. Trap +12
We summarize recent observations and modeling of the brightest Sgr A* flare to be observed simultaneously in (near)-infrared and X-rays to date. Trying to explain the spectral char…
The power of monitoring stellar orbits
S. Gillessen, F. Eisenhauer, H. Bartko +5
The center of the Milky Way hosts a massive black hole. The observational evidence for its existence is overwhelming. The compact radio source Sgr A* has been associated with a bla…