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Flares and variability from Sagittarius A*: five nights of simultaneous multi-wavelength observations
X. Haubois, K. Dodds-Eden, A. Weiss +8
Aims. We report on simultaneous observations and modeling of mid-infrared (MIR), near-infrared (NIR), and submillimeter (submm) emission of the source Sgr A* associated with the su…
A gas cloud on its way towards the super-massive black hole in the Galactic Centre
S. Gillessen, R. Genzel, T. K. Fritz +9
Measurements of stellar orbits provide compelling evidence that the compact radio source Sagittarius A* at the Galactic Centre is a black hole four million times the mass of the Su…
The star formation history of the Milky Way's Nuclear Star Cluster
O. Pfuhl, T. K. Fritz, M. Zilka +7
We present spatially resolved imaging and integral field spectroscopy data for 450 cool giant stars within 1\,pc from Sgr\,A*. We use the prominent CO bandheads to derive effective…
Line derived infrared extinction towards the Galactic Center
Tobias K. Fritz, Stefan Gillessen, Katie Dodds-Eden +7
We derive the extinction curve towards the Galactic Center from 1 to 19 micron. We use hydrogen emission lines of the minispiral observed by ISO-SWS and SINFONI. The extinction fre…
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.…
Time Dependent Models of Flares from Sagittarius A*
Katie Dodds-Eden, Prateek Sharma, Eliot Quataert +4
The emission from Sgr A*, the supermassive black hole in the Galactic Center, shows order of magnitude variability ("flares") a few times a day that is particularly prominent in th…
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…
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…
The orbit of the star S2 around SgrA* from VLT and Keck data
S. Gillessen, F. Eisenhauer, T. K. Fritz +5
Two recent papers (Ghez et al. 2008, Gillessen et al. 2009) have estimated the mass of and the distance to the massive black hole in the center of the Milky Way using stellar orbit…
What is limiting near-infrared astrometry in the Galactic Center?
Tobias K. Fritz, Stefan Gillessen, Sascha Trippe +7
We systematically investigate the error sources for high-precision astrometry from adaptive optics based near-infrared imaging data. We focus on the application in the crowded stel…
An Extremely Top-Heavy IMF in the Galactic Center Stellar Disks
H. Bartko, F. Martins, S. Trippe +19
We present new observations of the nuclear star cluster in the central parsec of the Galaxy with the adaptive optics assisted, integral field spectrograph SINFONI on the ESO/VLT. O…
Simultaneous Multi-Wavelength Observations of Sgr A* during 2007 April 1-11
F. Yusef-Zadeh, H. Bushouse, M. Wardle +18
We report the detection of variable emission from Sgr A* in almost all wavelength bands (i.e. centimeter, millimeter, submillimeter, near-IR and X-rays) during a multi-wavelength o…
Evidence for X-ray synchrotron emission from simultaneous mid-IR to X-ray observations of a strong Sgr A* flare
K. Dodds-Eden, D. Porquet, G. Trap +22
This paper reports measurements of Sgr A* made with NACO in L' -band (3.80 um), Ks-band (2.12 um) and H-band (1.66 um) and with VISIR in N-band (11.88 um) at the ESO VLT, as well a…