Publications (25)
The jet of the BL Lacertae object PKS 2201+044: MAD near-IR adaptive optics observations and comparison with optical, radio and X-ray data
E. Liuzzo, R. Falomo, A. Treves +14
Relativistic jets are a common feature of radio loud active galactic nuclei. Multifrequency observations are a unique tool to constrain their physics. We report on a detailed study…
A deep look into the cores of young clusters I. sigma-Orionis
H. Bouy, N. Huelamo, E. L. Martin +9
Nearby young clusters are privileged places to study the star formation history. Over the last decade, the sigma-Orionis cluster has been a prime location for the study of young ve…
A speckle interferometry survey of lambda Bootis stars
E. Marchetti, R. Faraggiana, P. Bonifacio
A search for duplicity of lambda Bootis stars has been made by using the speckle camera installed at the Telescopio Nazionale Galileo. The operation mode and the reduction procedur…
GeMS/GSAOI photometric and astrometric performance in dense stellar fields
E. Dalessandro, S. Saracino, L. Origlia +7
Ground-based imagers at 8m class telescopes assisted by Multi conjugate Adaptive Optics are primary facilities to obtain accurate photometry and proper motions in dense stellar fie…
MCAO near-IR photometry of the Globular Cluster NGC 6388: MAD observations in crowded fields
A. Moretti, G. Piotto, C. Arcidiacono +15
Deep photometry of crowded fields, such as Galactic Globular Clusters, is severely limited by the actual resolution of ground-based telescopes. On the other hand, the Hubble Space…
Multi-Conjugate Adaptive Optics images of the Trapezium Cluster
H. Bouy, J. Kolb, E. Marchetti +3
Multi-Conjugate Adaptive Optics (MCAO) combines the advantages of standard adaptive optics, which provides high contrast and high spatial resolution, and of wide field ~1' imaging.…
On-sky demonstration of matched filters for wavefront measurements using ELT-scale elongated laser guide stars
A. G. Basden, L. Bardou, D. Bonaccini Calia +18
The performance of adaptive optics systems is partially dependant on the algorithms used within the real-time control system to compute wavefront slope measurements. We demonstrate…
Low-Temperature Phase Boundary of dilute Lattice Spin Glasses
S. Boettcher, E. Marchetti
The thermal-to-percolative crossover exponent Ï, well-known for ferromagnetic systems, is studied extensively for Edwards-Anderson spin glasses. The scaling of defect energies are…
Stellar density profile and mass of the Milky Way Bulge from VVV data
E. Valenti, M. Zoccali, O. A. Gonzalez +6
We present the first stellar density profile of the Milky Way bulge reaching latitude . It is derived by counting red clump stars within the colour\--magnitude diagram c…
Observations of Isolated Neutron Stars with the ESO Multi-Conjugate Adaptive Optics Demonstrator
R. P. Mignani, R. Falomo, A. Moretti +10
High-energy observations have unveiled peculiar classes of isolated neutron stars which, at variance with radio pulsars, are mostly radio silent and not powered by the star rotatio…
On the radio and NIR jet of PKS 2155-304 and its close environment
E. Liuzzo, R. Falomo, A. Treves +13
PKS 2155-304 is one of the brightest BL Lac object in the sky and a very well studied target from radio to TeV bands. We report on high-resolution (~ 0.12 arcsec) direct imaging of…
On a new Near-Infrared method to estimate the absolute ages of star clusters: NGC3201 as a first test case
G. Bono, P. B. Stetson, D. A. VandenBerg +24
We present a new method to estimate the absolute ages of stellar systems. This method is based on the difference in magnitude between the main sequence turn-off (MSTO) and a well d…
On-sky results of the adaptive optics MACAO for the new IR-spectrograph CRIRES at VLT
J. Paufique, P. Biereichel, B. Delabre +16
The adaptive optics MACAO has been implemented in 6 focii of the VLT observatory, in three different flavors. We present in this paper the results obtained during the commissioning…
On the white dwarf cooling sequence of the globular cluster Omega Centauri
A. Calamida, C. E. Corsi, G. Bono +16
We present deep and precise photometry (F435, F625W, F658N) of Omega Cen collected with the Advanced Camera for Surveys (ACS) on board the Hubble Space Telescope (HST). We have ide…
Gravitational Wave detection through microlensing?
R. Ragazzoni, G. Valente, E. Marchetti
It is shown that accurate photometric observations of a relatively high--magnification microlensing event (), occurring close to the line of sight of a gravitational wave (…
On the radial distribution of white dwarfs in the Galactic globular cluster Omega Cen
A. Calamida, C. E. Corsi, G. Bono +14
We present deep and accurate photometry (F435W, F625W, F658N) of the Galactic Globular Cluster Omega Cen collected with the Advanced Camera for Surveys (ACS) on board the Hubble Sp…
The jet of the BL Lac object PKS 0521 -365 in the near-IR : MAD adaptive optics observations
R. Falomo, E. Pian, A. Treves +12
BL Lac objects are low--power active nuclei exhibiting a variety of peculiar properties that are caused by the presence of a relativistic jet and orientation effects. We present he…
MAD Adaptive Optics Imaging of High Luminosity Quasars: A Pilot Project
E. Liuzzo, R. Falomo, S. Paiano +14
We present near-IR images of five luminous quasars at z~2 and one at z~4 obtained with an experimental adaptive optics instrument at the ESO Very Large Telescope. The observations…
Resolving Stellar Populations outside the Local Group: MAD observations of UKS2323-326
M. Gullieuszik, L. Greggio, E. V. Held +14
We present a study aimed at deriving constraints on star formation at intermediate ages from the evolved stellar populations in the dwarf irregular galaxy UKS2323-326. These observ…
On the RR Lyrae stars in globulars: V. the complete Near-Infrared (JHKs) census of omega Centauri RR Lyrae variables
V. F. Braga, P. B. Stetson, G. Bono +35
We present a new complete Near-Infrared (NIR, ) census of RR Lyrae stars (RRLs) in the globular Cen (NGC 5139). We collected 15,472 images with 4-8m class teles…
The pipeline for the ExoMars DREAMS scientific data archiving
P. Schipani, L. Marty, M. Mannetta +15
DREAMS (Dust Characterisation, Risk Assessment, and Environment Analyser on the Martian Surface) is a payload accommodated on the Schiaparelli Entry and Descent Module (EDM) of Exo…
MAD@VLT: Deep into the Madding Crowd of Omega Centauri
G. Bono, A. Calamida, C. E. Corsi +18
We present deep and accurate Near-Infrared (NIR) photometry of the Galactic Globular Cluster (GC) Omega Cen. Data were collected using the Multi-Conjugate Adaptive Optics Demonstra…
A benchmark for multi-conjugated AO: VLT-MAD observations of the young massive cluster Trumpler 14
B. Rochau, W. Brandner, A. Stolte +6
MAD is the first multi-conjugated adaptive optics system at the VLT. We present H and Ks observations of the young massive cluster Trumpler 14 revealing the power of MCAO systems b…
The commissioning phase
F. Bortoletto, S. Benetti, G. Bonanno +34
In May 1997 a consistent part of the services and structures committed to the industry had already been released to the commissioning group. The telescope itself was, with the exce…
A deep look into the core of young clusters. II. lambda-Orionis
H. Bouy, N. Huelamo, D. Barrado y Navascues +14
Over the past years, the lambda-Orionis cluster has been a prime location for the study of young very low mass stars, substellar and isolated planetary mass objects and the determi…