Infrared wavefront sensing for adaptive optics assisted galactic center observations with GRAVITY

2020 ◽  
Author(s):  
Stefan Hippler ◽  
Wolfgang Brandner ◽  
Silvia Scheithauer ◽  
Martin Kulas ◽  
Johana Panduro ◽  
...  
Keyword(s):  
Adaptive Optics ◽  
Galactic Center ◽  
Wavefront Sensing

scholarly journals Infrared Wavefront Sensing for Adaptive Optics Assisted Galactic Center Observations with the VLT Interferometer and GRAVITY: Operation and Results

Instruments ◽  
2020 ◽  
Vol 4 (3) ◽  
pp. 20
Author(s):  
Stefan Hippler ◽  
Wolfgang Brandner ◽  
Silvia Scheithauer ◽  
Martin Kulas ◽  
Johana Panduro ◽  
...  
Keyword(s):  
Adaptive Optics ◽  
Near Infrared ◽  
Galactic Center ◽  
Weather Conditions ◽  
Wavefront Sensing ◽  
Large Telescope ◽  
Auxiliary Component ◽  
Very Large Telescope ◽  
Beam Combiner ◽  
First Time

This article describes the operation of the near-infrared wavefront sensing based Adaptive Optics (AO) system CIAO. The Coudé Infrared Adaptive Optics (CIAO) system is a central auxiliary component of the Very Large Telescope (VLT) interferometer (VLTI). It enables in particular the observations of the Galactic Center (GC) using the GRAVITY instrument. GRAVITY is a highly specialized beam combiner, a device that coherently combines the light of the four 8-m telescopes and finally records interferometric measurements in the K-band on 6 baselines simultaneously. CIAO compensates for phase disturbances caused by atmospheric turbulence, which all four 8 m Unit Telescopes (UT) experience during observation. Each of the four CIAO units generates an almost diffraction-limited image quality at its UT, which ensures that maximum flux of the observed stellar object enters the fibers of the GRAVITY beam combiner. We present CIAO performance data obtained in the first 3 years of operation as a function of weather conditions. We describe how CIAO is configured and used for observations with GRAVITY. In addition, we focus on the outstanding features of the near-infrared sensitive Saphira detector, which is used for the first time on Paranal, and show how it works as a wavefront sensor detector.

Adaptive optics confocal microscopy using direct wavefront sensing

2011 ◽  
Vol 36 (7) ◽  
pp. 1062 ◽  
Author(s):  
Xiaodong Tao ◽  
Bautista Fernandez ◽  
Oscar Azucena ◽  
Min Fu ◽  
Denise Garcia ◽  
...  
Keyword(s):  
Confocal Microscopy ◽  
Adaptive Optics ◽  
Wavefront Sensing

scholarly journals Adaptive optics $\vec{L}$-band observations of the Galactic Center region

2001 ◽  
Vol 376 (1) ◽  
pp. 124-135 ◽  
Author(s):  
Y. Clénet ◽  
D. Rouan ◽  
E. Gendron ◽  
J. Montri ◽  
F. Rigaut ◽  
...  
Keyword(s):  
Adaptive Optics ◽  
Galactic Center ◽  
Center Region ◽  
L Band

scholarly journals Infrared Imaging of the Arches Cluster - Adaptive Optics in the Densest Region of the Milky Way

2002 ◽  
Vol 207 ◽  
pp. 132-134
Author(s):  
Andrea Stolte ◽  
Eva K. Grebel ◽  
Wolfgang Brandner ◽  
Donald F. Figer
Keyword(s):  
Adaptive Optics ◽  
Milky Way ◽  
Infrared Imaging ◽  
Galactic Center ◽  
Cluster Formation ◽  
Extreme Environment ◽  
Mass Function ◽  
Cluster Center ◽  
Limiting Factor ◽  
Dense Cluster

The Arches cluster - located only 11′ from the Galactic Center (GC) - is one of the densest and richest young star clusters in the Milky Way. With an age of only about 2 Myr, it is ideally suited to study massive cluster formation in an extreme environment. We find an IMF slope of Γ = −0.77 from 5 to 100 M⊙, in good agreement with the results from HST/NICMOS from Figer et al. (1999). The limiting factor in the dense cluster center is crowding. With the new AO systems, high resolution analysis of the dense cluster region combined with very deep infrared photometry is available. We have analysed deep H and K′ images of the cluster center obtained with the GEMINI/Hokupa'a adaptive optics system. Colour-magnitude diagrams and the IMF are constructed from these data. A comparison with isochrones yields the mass function.

scholarly journals Adaptive-optics assisted near-infrared polarization measurements of sources in the Galactic center

2011 ◽  
Vol 534 ◽  
pp. A117 ◽  
Author(s):  
R. M. Buchholz ◽  
G. Witzel ◽  
R. Schödel ◽  
A. Eckart ◽  
M. Bremer ◽  
...  
Keyword(s):  
Adaptive Optics ◽  
Near Infrared ◽  
Galactic Center ◽  
Polarization Measurements

First results of an on-line adaptive optics system with atmospheric wavefront sensing by an artificial neural network

1992 ◽  
Vol 390 ◽  
pp. L41 ◽  
Author(s):  
M. Lloyd-Hart ◽  
P. Wizinowich ◽  
B. McLeod ◽  
D. Wittman ◽  
D. Colucci ◽  
...  
Keyword(s):  
Neural Network ◽  
Artificial Neural Network ◽  
Adaptive Optics ◽  
Wavefront Sensing ◽  
First Results ◽  
On Line ◽  
Artificial Neural ◽  
Adaptive Optics System

scholarly journals An Adaptive Optics Survey of Stellar Variability at the Galactic Center

2019 ◽  
Vol 871 (1) ◽  
pp. 103 ◽  
Author(s):  
Abhimat Krishna Gautam ◽  
Tuan Do ◽  
Andrea M. Ghez ◽  
Mark R. Morris ◽  
Gregory D. Martinez ◽  
...  
Keyword(s):  
Adaptive Optics ◽  
Galactic Center
Sign in / Sign up

Export Citation Format

Share Document