195 research outputs found
Impact of Sodium Layer variations on the performance of the E-ELT MCAO module
Multi-Conjugate Adaptive Optics systems based on sodium Laser Guide Stars may
exploit Natural Guide Stars to solve intrinsic limitations of artificial
beacons (tip-tilt indetermination and anisoplanatism) and to mitigate the
impact of the sodium layer structure and variability. The sodium layer may also
have transverse structures leading to differential effects among Laser Guide
Stars. Starting from the analysis of the input perturbations related to the
Sodium Layer variability, modeled directly on measured sodium layer profiles,
we analyze, through a simplified end-to-end simulation code, the impact of the
low/medium orders induced on global performance of the European Extremely Large
Telescope Multi-Conjugate Adaptive Optics module MAORY.Comment: 7 pages, 5 figures, SPIE conference Proceedin
Laser Guide Stars for Extremely Large Telescopes: Efficient Shack-Hartmann Wavefront Sensor Design using Weighted center-of-gravity algorithm
Over the last few years increasing consideration has been given to the study
of Laser Guide Stars (LGS) for the measurement of the disturbance introduced by
the atmosphere in optical and near-infrared astronomical observations from the
ground. A possible method for the generation of a LGS is the excitation of the
Sodium layer in the upper atmosphere at approximately 90 km of altitude. Since
the Sodium layer is approximately 10 km thick, the artificial reference source
looks elongated, especially when observed from the edge of a large aperture.
The spot elongation strongly limits the performance of the most common
wavefront sensors. The centroiding accuracy in a Shack-Hartmann wavefront
sensor, for instance, decreases proportionally to the elongation (in a photon
noise dominated regime). To compensate for this effect a straightforward
solution is to increase the laser power, i.e. to increase the number of
detected photons per subaperture. The scope of the work presented in this paper
is twofold: an analysis of the performance of the Weighted Center of Gravity
algorithm for centroiding with elongated spots and the determination of the
required number of photons to achieve a certain average wavefront error over
the telescope aperture.Comment: 10 pages, 14 figure
energetic and economic analysis of a new concept of solar concentrator for residential application
Abstract Renewable energy penetration is increasing in last years, covering a more and more important role in both electrical and thermal supply. Nowadays, the photovoltaic conversion is a consolidated technology and can be efficiently combined with solar concentration. In this study, a new concept of photovoltaic solar concentrator based on non-conventional mirrors coupled with high efficiency triple-junctions cells is described and discussed. More in details, as for the optical design, deformations are applied to classical spherical mirrors to control solar aberrations and boost efficiency of a receiver consisting in a dense array of cells. The efficiency enhance is obtained by high matching between the collected solar irradiance and the receiver electrical features. The concentrator is able to produce both electrical and thermal energy: the system requires in fact an active cooling circuit to maintain the cells performance. This behavior makes the system suitable for combined heat and power applications with particular reference to high direct irradiance environments. An analytical study, considering a residential utility has been performed in order to understand the energetic and economic performance of the system. In particular, a simulation has been carried out by the use of an in-house-developed calculation code considering a whole year of operation
On the radio and NIR jet of PKS 2155-304 and its close environment
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 the field of PKS 2155-304 using adaptive optics
near-IR observations in J and Ks bands obtained with the ESO multi-conjugate
adaptive optic demonstrator (MAD) at the Very Large Telescope. These data are
complemented with archival VLA images at various frequencies to investigate the
properties of the close environment of the source. We characterized the faint
galaxies that form the poor group associated to the target. No radio emission
is present for these galaxies, while an old radio jet at ~ 20 kpc from the
nucleus of PKS 2155-304 and a jet-like structure of ~ 2 kpc (~ 1 arcsec) in the
eastern direction are revealed. No counterparts of these radio jets are found
in the NIR or in archival Chandra observations.Comment: 10 pages, 7 figures, accepted for publication in The Astronomical
Journa
An E-ELT Case Study: Colour-Magnitude Diagrams of an Old Galaxy in the Virgo Cluster
One of the key science goals for a diffraction limited imager on an Extremely
Large Telescope (ELT) is the resolution of individual stars down to faint
limits in distant galaxies. The aim of this study is to test the proposed
capabilities of a multi-conjugate adaptive optics (MCAO) assisted imager
working at the diffraction limit, in IJHK filters, on a 42m diameter ELT to
carry out accurate stellar photometry in crowded images in an Elliptical-like
galaxy at the distance of the Virgo cluster. As the basis for realistic
simulations we have used the phase A studies of the European-ELT project,
including the MICADO imager (Davies & Genzel 2010) and the MAORY MCAO module
(Diolaiti 2010). We convolved a complex resolved stellar population with the
telescope and instrument performance expectations to create realistic images.
We then tested the ability of the currently available photometric packages
STARFINDER and DAOPHOT to handle the simulated images. Our results show that
deep Colour-Magnitude Diagrams (photometric error, 0.25 at I27.2;
H25. and K24.6) of old stellar populations in galaxies, at the
distance of Virgo, are feasible at a maximum surface brightness,
17 mag/arcsec (down to M and M M), and
significantly deeper (photometric error, 0.25 at I29.3; H26.6
and K26.2) for 21 mag/arcsec (down to M and
M M). The photometric errors, and thus also the depth of
the photometry should be improved with photometry packages specifically
designed to adapt to an ELT MCAO Point Spread Function. We also make a simple
comparison between these simulations and what can be expected from a Single
Conjugate Adaptive Optics feed to MICADO and also the James Webb Space
Telescope.Comment: 17 pages, 22 figures, accepted on A&
Analysis of isoplanatic high resolution stellar fields by Starfinder code
We describe a new code for the deep analysis of stellar fields, designed for
Adaptive Optics Nyquist-sampled images with high and low Strehl ratio. The
Point Spread Function is extracted directly from the image frame, to take into
account the actual structure of the instrumental response and the atmospheric
effects. The code is written in IDL language and organized in the form of a
self-contained widget-based application, provided with a series of tools for
data visualization and analysis. A description of the method and some
applications to AO data are presented.Comment: 10 pages, 13 figures. Accepted for publication in Astron.& Astrophys.
Sup. Se
MAD Adaptive Optics Imaging of High Luminosity Quasars: A Pilot Project
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 are part of a program aimed at demonstrating the
capabilities of multi-conjugated adaptive optics imaging combined with the use
of natural guide stars for high spatial resolution studies on large telescopes.
The observations were mostly obtained under poor seeing conditions but in two
cases. In spite of these non optimal conditions, the resulting images of point
sources have cores of FWHM ~0.2 arcsec. We are able to characterize the host
galaxy properties for 2 sources and set stringent upper limits to the galaxy
luminosity for the others. We also report on the expected capabilities for
investigating the host galaxies of distant quasars with adaptive optics systems
coupled with future Extremely Large Telescopes. Detailed simulations show that
it will be possible to characterize compact (2-3 kpc) quasar host galaxies for
QSOs at z = 2 with nucleus K-magnitude spanning from 15 to 20 (corresponding to
absolute magnitude -31 to -26) and host galaxies that are 4 mag fainter than
their nuclei.Comment: 19 pages, 12 figures, accepted for pubblication in The Astronomical
Journa
The jet of the BL Lac object PKS 0521 -365 in the near-IR : MAD adaptive optics observations
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 here adaptive optics near-IR images at high spatial resolution of
the nearby BL Lac object PKS 0521-365, which is known to display a prominent
jet both at radio and optical frequencies. The observations were obtained in
Ks--band using the ESO multi-conjugated adaptive optics demonstrator at the
Very Large Telescope. This allowed us to obtain images with 0.1 arcsec
effective resolution. We performed a detailed analysis of the jet and its
related features from the near-IR images, and combined them with images
previously obtained with HST in the R band and by a re-analysis of VLA radio
maps. We find a remarkable similarity in the structure of the jet at radio,
near-IR, and optical wavelengths. The broad--band emission of the jet knots is
dominated by synchrotron radiation, while the nucleus also exhibits a
significant inverse Compton component. We discovered the near-IR counterpart of
the radio hotspot and found that the near-IR flux is consistent with being a
synchrotron emission from radio to X-ray. The bright red object (red-tip),
detached but well aligned with the jet, is well resolved in the near-IR and has
a linear light profile. Since it has no radio counterpart, we propose that it
is a background galaxy not associated with the jet. The new adaptive optics
near-IR images and previous observations at other frequencies allow us to study
the complex environment around the remarkable BL Lac object PKS 0521-365. These
data exemplify the capabilities of multi conjugate adaptive optics observations
of extragalactic extended sources.Comment: accepted for publication in Astronomy and Astrophysics 9 pages. A & A
2009, in pres
StarFinder: an IDL GUI based code to analyze crowded fields with isoplanatic correcting PSF fitting
StarFinder is a new code for the deep analysis of stellar fields, designed
for well-sampled images with high and low Strehl ratio. It is organized in the
form of a self-contained IDL widget-based application, with a 'user-friendly'
graphic interface. We give here a general description of the code along with
some applications to real data with space-invariant Point Spread Function
(PSF). We present also some methods to handle anisoplanatic effects in
wide-field Adaptive Optics (AO)observations.Comment: 9 pages, to to be published on "Proceeedings of Adaptive Optical
Systems Technology",Proc.of SPIE,Vol.4007,2000. In pres
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