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Evidence for Warped Disks of Young Stars in the Galactic Center
H. Bartko, F. Martins, T. K. Fritz +18
The central parsec around the super-massive black hole in the Galactic Center hosts more than 100 young and massive stars. Outside the central cusp (R~1") the majority of these O a…
Monitoring stellar orbits around the Massive Black Hole in the Galactic Center
S. Gillessen, F. Eisenhauer, S. Trippe +4
We present the results of 16 years of monitoring stellar orbits around the massive black hole in center of the Milky Way using high resolution NIR techniques. This work refines our…
Kinematics of the old stellar population at the Galactic Center
S. Trippe, S. Gillessen, O. E. Gerhard +8
We aim at a detailed description of the kinematic properties of the old, (several Gyrs) late-type CO-absorption star population among the Galactic centre (GC) cluster stars. We app…
Multiplicity of young stars in and around R Corona Australis
R. Köhler, R. Neuhäuser, S. Krämer +3
The R CrA star-forming region has a small dark cloud with quite a number of protostars, T Tauri stars, and some Herbig Ae/Be stars, plus a number of weak-line T Tauri stars around…
From rings to bulges: evidence for rapid secular galaxy evolution at z~2 from integral field spectroscopy in the SINS survey
R. Genzel, A. Burkert, N. Bouche +22
We present Ha integral field spectroscopy of well resolved, UV/optically selected z~2 star-forming galaxies as part of the SINS survey with SINFONI on the ESO VLT. Our laser guide…
Near-infrared polarization images of the Orion proplyds
S. Rost, A. Eckart, T. Ott
We performed AO-assisted high-resolution imaging polarimetry on selected Orion proplyds close to the Trapezium stars in the J, H, and K bands. Differential polarimetric images of o…
On the nature of the fast moving star S2 in the Galactic Center
F. Martins, S. Gillessen, F. Eisenhauer +3
We analyze the properties of the star S2 orbiting the supermassive black hole at the center of the Galaxy. A high quality SINFONI H and K band spectrum obtained from coadding 23.5…
The most massive stars in the Arches cluster
F. Martins, D. J. Hillier, T. Paumard +3
We study a sample composed of 28 of the brightest stars in the Arches cluster. We analyze K-band spectra obtained with the integral field spectrograph SINFONI on the VLT. Atmospher…
Evidence for a Long-Standing Top-Heavy IMF in the Central Parsec of the Galaxy
H. Maness, F. Martins, S. Trippe +10
We classify 329 late-type giants within 1 parsec of Sgr A*, using the adaptive optics integral field spectrometer SINFONI on the VLT. These observations represent the deepest spect…
Stellar and wind properties of massive stars in the central parsec of the Galaxy
F. Martins, R. Genzel, D. J. Hillier +5
We study the stellar and wind properties of massive stars in the central cluster of the Galaxy. We use non-LTE atmosphere models including winds and line-blanketing to fit their H…
The structure of the nuclear stellar cluster of the Milky Way
R. Schoedel, A. Eckart, T. Alexander +8
We present high-resolution seeing limited and AO NIR imaging observations of the stellar cluster within about one parsec of Sgr A*, the massive black hole at the centre of the Milk…
The Position of Sagittarius A*: III. Motion of the Stellar Cusp
M. J. Reid, K. M. Menten, S. Trippe +2
In the first two papers of this series, we determined the position of Sgr A* on infrared images, by aligning the positions of red giant stars with positions measured at radio wavel…
A polarised infrared flare from Sagittarius A* and the signatures of orbiting plasma hotspots
S. Trippe, T. Paumard, T. Ott +4
In this article we summarise and discuss the infrared, radio, and X-ray emission from the supermassive black hole in the Galactic Centre, SgrA*. We include new results from near-in…
Polarimetry of near-infrared flares from Sagittarius A*
A. Eckart, R. Schoedel, L. Meyer +3
Context: We report new polarization measurements of the variable near-infrared emission of the SgrA* counterpart associated with the massive 3--4 10^6 solar masses Black Hole at th…
GCIRS16SW: a massive eclipsing binary in the Galactic Center
F. Martins, S. Trippe, T. Paumard +7
We report on the spectroscopic monitoring of GCIRS16SW, an Ofpe/WN9 star and LBV candidate in the central parsec of the Galaxy. SINFONI observations show strong daily spectroscopic…
The Two Young Star Disks in the Central Parsec of the Galaxy: Properties, Dynamics and Formation
T. Paumard, R. Genzel, F. Martins +11
We report the definite spectroscopic identification of 41 OB supergiants, giants and main sequence stars in the central parsec of the Galaxy. Detection of their absorption lines ha…
Atmospheric Turbulence Compensation with Laser Phase Shifting Interferometry
S. Rabien, F. Eisenhauer, R. Genzel +2
Laser guide stars with adaptive optics allow astronomical image correction in the absence of a natural guide star. Single guide star systems with a star created in the earth's sodi…
Clockwise Stellar Disk and the Dark Mass in the Galactic Center
A. M. Beloborodov, Y. Levin, F. Eisenhauer +4
Two disks of young stars have recently been discovered in the Galactic Center. The disks are rotating in the gravitational field of the central black hole at radii r=0.1-0.3 pc and…
The Flare Activity of SgrA*; New Coordinated mm to X-Ray Observations
A. Eckart, F. K. Baganoff, R. Schoedel +17
We report new simultaneous near-infrared/sub-millimeter/X-ray observations of the SgrA* counterpart associated with the massive 3-4x10**6 solar mass black hole at the Galactic Cent…
Variations in the spectral slope of Sgr A* during a NIR flare
S. Gillessen, F. Eisenhauer, E. Quataert +10
We have observed a bright flare of Sgr A* in the near infrared with the adaptive optics assisted integral field spectrometer SINFON. Within the uncertainties, the observed spectrum…
GCIRS34W: An irregular variable in the Galactic Centre
S. Trippe, F. Martins, T. Ott +7
We report the results of time-resolved photometric and spectroscopic near-infrared observations of the Ofpe/WN9 star and LBV candidate GCIRS34W in the Galactic Centre star cluster.…
A Black Hole in the Galactic Center Complex IRS 13E?
R. Schoedel, A. Eckart, C. Iserlohe +2
The IRS 13E complex is an unusual concentration of massive, early-type stars at a projected distance of ~0.13 pc from the Milky Way's central supermassive black hole Sagittarius A*…
Detection of the Sgr A* activity at 3.8 and 4.8 microns with NACO
Y. Clénet, D. Rouan, D. Gratadour +6
L'-band (lambda=3.8 microns) and M'-band (lambda=4.8 microns) observations of the Galactic Center region, performed in 2003 at VLT (ESO) with the adaptive optics imager NACO, have…
Census of the Galactic Centre early-type stars using spectro-imagery
T. Paumard, R. Genzel, J. P. Maillard +4
The few central parsecs of the Galaxy are known to contain a surprising population of early-type stars, including at least 30 Wolf-Rayet stars and luminous blue variables (LBV), id…