N. Ageorges

Publications127
h-index22
Citations3,412
Highly Influential Citations385
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Ground-based and Airborne Instrumentation for Astronomy III
A star in a 15.2-year orbit around the supermassive black hole at the centre of the Milky Way
TLDR
Ten years of high-resolution astrometric imaging allow us to trace two-thirds of the orbit of the star currently closest to the compact radio source (and massive black-hole candidate) Sagittarius A* and show that the star is on a bound, highly elliptical keplerian orbit around Sgr A*.
HAWK-I imaging of the X-ray luminous galaxy cluster XMMU J2235.3-2557 : The red sequence at z =1.39
We use HAWK-I, the recently-commissioned near-IR imager on Yepun (VLT-UT4), to obtain wide-field, high-resolution images of the X-ray luminous galaxy cluster XMMU J2235.3-2557 in the J and K s bands,…
HAWK-I: the high-acuity wide-field K-band imager for the ESO Very Large Telescope
We describe the design, development, and performance of HAWK-I, the new High-Acuity Wide-field K-band Imager for ESO’s Very Large Telescope, which is equipped with a mosaic of four 2 k × 2 k arrays…
LBT/LUCIFER OBSERVATIONS OF THE z ∼ 2 LENSED GALAXY J0900+2234*
We present rest-frame optical images and spectra of the gravitationally lensed, star-forming galaxy J0900+2234 (z = 2.03). The observations were performed with the newly commissioned LUCIFER1…
High-Resolution CO and H2 Molecular Line Imaging of a Cometary Globule in the Helix Nebula
We report high-resolution imaging of a prominent cometary globule in the Helix Nebula in the CO J = 1-0 (2.6 mm) and H2 v = 1-0 S(1) (2.12 μm) lines. The observations confirm that globules consist of…
BLACK HOLE MASS ESTIMATES BASED ON C IV ARE CONSISTENT WITH THOSE BASED ON THE BALMER LINES
Using a sample of high-redshift lensed quasars from the CASTLES project with observed-frame ultraviolet or optical and near-infrared spectra, we have searched for possible biases between supermassive…
Charon's size and an upper limit on its atmosphere from a stellar occultation
TLDR
Observations from a multi-station stellar occultation by Charon are reported, which are used to derive the radius of Pluto and Charon, RC = 603.6 ± 1.4 km (1σ), and the density of ρ = 1.71 ± 0.08 g cm-3.3 (3σ) nanobar, assuming respectively a pure nitrogen or pure methane atmosphere.
LUCIFER1 commissioning at the LBT
LUCIFER 1 is the rst of two identical camera-spectrograph units installed at the LBT (Large Binocular Telescope) on Mount Graham in Arizona. Its commissioning took place between September 2008 and…
NAOS+CONICA at YEPUN: first VLT adaptive optics system sees first light
NAOS+CONICA (hereafter NACO) saw first light on November 25, 2001, at VLT UT4 (YEPUN). NACO partially compensates the effects of atmospheric turbulence (seeing) and provides diffraction-limited…
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