Two-mirror, three-reflection telescopes as candidates for sky surveys in ground and space applications. The MINITRUST: an active optics warping telescope for wide-field astronomy

2002 ◽  
Author(s):  
Roberto F. Viotti ◽  
Cesare D. La Padula ◽  
Agostino Vignato ◽  
Gerard R. Lemaitre ◽  
Pierre Montiel ◽  
...  
Keyword(s):  
Wide Field ◽  
Space Applications ◽  
Active Optics ◽  
Sky Surveys

scholarly journals Active optics in astronomy – modeling of deformable substrates: freeform surfaces for FIREBall and MESSIER

2018 ◽  
Vol 27 (5-6) ◽  
Author(s):  
Gérard Rene Lemaitre
Keyword(s):  
Adaptive Optics ◽  
Large Scale ◽  
Wide Field ◽  
Freeform Surfaces ◽  
Aspheric Surfaces ◽  
Massive Black Holes ◽  
Active Optics ◽  
Minimum Number ◽  
Co Addition ◽  
Large Telescopes

AbstractActive optics techniques on large telescopes and astronomical instrumentations provide high imaging quality. For ground-based astronomy, the co-addition of adaptive optics again increases angular resolution up to providing diffraction-limited imaging at least in the infrared. Active and adaptive optics marked milestone progress in the detection of exoplanets, super-massive black holes, and large-scale structure of galaxies. This paper is dedicated to highly deformable active optics that can generate non-axisymmetric aspheric surfaces – or freeform surfaces – by use of a minimum number of actuators: a single uniform load acts over the surface of a vase-form substrate whilst under reaction to its elliptical perimeter ring. Two such instruments are presented: (1) the Faint Intergalactic Redshifted Emission Balloon (FIREBall) telescope and multi object spectrograph (MOS) where the freeform reflective diffraction grating is generated by replication of a deformable master grating, and (2) the MESSIER wide-field low-central-obstruction three-mirror-anastigmat (TMA) telescope proposal where the freeform mirror is generated by stress figuring and elastic relaxation. Freeform surfaces were obtained by plane super-polishing. Preliminary analysis required use of the optics theory of 3rd-order aberrations and elasticity theory of thin elliptical plates. Final cross-optimizations were carried out with Zemax raytracing code and Nastran FEA elasticity code in order to determine geometry of the deformable substrates.

Removing static aberrations from the active optics system of a wide-field telescope

2012 ◽  
Vol 29 (7) ◽  
pp. 1359 ◽  
Author(s):  
Pietro Schipani ◽  
Lothar Noethe ◽  
Carmelo Arcidiacono ◽  
Javier Argomedo ◽  
Massimo Dall’Ora ◽  
...  
Keyword(s):  
Wide Field ◽  
Active Optics

Active optics and modified-Rumsey wide-field telescopes: MINITRUST demonstrators with vase- and tulip-form mirrors

2005 ◽  
Vol 44 (34) ◽  
pp. 7322 ◽  
Author(s):  
Gérard R. Lemaître ◽  
Pierre Montiel ◽  
Patrice Joulié ◽  
Kjetil Dohlen ◽  
Patrick Lanzoni
Keyword(s):  
Wide Field ◽  
Active Optics

Infrared Surveys Planned for ASTRO-F

2005 ◽  
Vol 216 ◽  
pp. 347-352
Author(s):  
Hiroshi Shibai
Keyword(s):  
Far Infrared ◽  
Wide Field ◽  
Wavelength Band ◽  
Mid Infrared ◽  
Field Surveys ◽  
Infrared Wavelength ◽  
Sky Surveys ◽  
Sky Survey ◽  
Infrared Surveys ◽  
Higher Sensitivity

The next survey mission, ASTRO-F, is scheduled for launch in 2005. This is the first Japanese satellite dedicated to infrared astronomy. The primary purpose of this project is to investigate the birth and evolution of galaxies in the early universe through deep, wide-field surveys at wavelengths ranging from 2 to 200 microns. In the far-infrared wavelength band, ASTRO-F will conduct an all-sky survey like the IRAS survey with several tens of times higher sensitivity and several times better spatial resolution. In the near- and mid-infrared, wide area sky-surveys will be conducted over pre-selected portions of the sky in 13 bands ranging from 2-200microns. In addition to these photometric surveys, low-resolution spectroscopic capabilities are available for all wavelength bands. The ASTRO-F mission will produce a fundamental database for the next generation of advanced observatories, for example Herschel, and JWST, and will complement the SIRTF mission by virtue of its wide sky coverage.

Active optics and the axisymmetric case: MINITRUST wide-field three-reflection telescopes with mirrors aspherized from tulip and vase forms

2004 ◽  
Author(s):  
Gerard R. Lemaitre ◽  
Pierre Montiel ◽  
Patrice Joulie ◽  
Kjetil Dohlen ◽  
Patrick Lanzoni
Keyword(s):  
Wide Field ◽  
Active Optics ◽  
Axisymmetric Case

scholarly journals Identifying the Most Luminous QSOs in the Universe from Multiwavelength Sky Surveys

2013 ◽  
Vol 9 (S304) ◽  
pp. 204-204
Author(s):  
Amy Kimball ◽  
J. Condon ◽  
C. Lonsdale ◽  
M. Lacy
Keyword(s):  
Galaxy Evolution ◽  
Sloan Digital Sky Survey ◽  
Host Galaxy ◽  
Wide Field ◽  
Host Galaxies ◽  
Sky Surveys ◽  
Bolometric Luminosity ◽  
Star Formation Activity ◽  
Major Merger ◽  
The Universe

AbstractI have combined data from sky surveys in the UV to the mid-IR, along with radio and X-ray data, to identify the most luminous QSOs in the Universe. The primary sky surveys were the Sloan Digital Sky Survey (SDSS) 7th Data Release QSO Catalog, which provides unambiguous broad-line QSO classification and robust redshifts, and the Wide-field Infrared Survey Explorer (WISE) mid-IR catalog, because a large percentage of QSO bolometric luminous emerges in the IR. Out of the 100,000 SDSS/WISE QSOs, we find 140 (< 0.2%) with bolometric luminosity greater than 2×1014Lo, with redshifts ranging from about 1.7 to 5. The most luminous QSO found has Lbol ≈7×1014Lo. Merger-based galaxy evolution models predict that the host galaxies of such sources at peak QSO luminosity are undergoing a short-lived phase of extreme AGN feedback and massive star-formation activity after a major merger. Upcoming sub-mm observations with the new Atacama Large Millimeter/Sub-millimeter Array (ALMA), for a subset of the sample, will soon reveal crucial host galaxy properties of this unique sample.

scholarly journals What did we learn about the Milky Way during the last decade, and what shall we learn using Gaia and LSST?

2013 ◽  
Vol 9 (S298) ◽  
pp. 281-291
Author(s):  
željko Ivezić ◽  
Timothy C. Beers ◽  
Mario Jurić ◽  
Sarah R. Loebman ◽  
Michael Berry
Keyword(s):  
Galaxy Formation ◽  
Milky Way ◽  
Galactic Plane ◽  
Dimensional Space ◽  
Dark Matter Halo ◽  
Wide Field ◽  
Stellar Content ◽  
Large Area ◽  
Sky Surveys ◽  
Improve Measurement

AbstractStudies of stellar populations have been reinvigorated during the last decade by the advent of large-area sky surveys such as SDSS, 2MASS, RAVE, and others. These data, together with theoretical and modeling advances, are revolutionizing our understanding of the nature of the Milky Way, and galaxy formation and evolution in general. The abundance of substructure in the multi-dimensional space of various observables, such as position, kinematics, and metallicity, is by now proven beyond doubt, and demonstrates the importance of mergers in the growth of galaxies. Unlike smooth models that involve simple components, the new data reviewed here clearly exhibit many irregular structures, such as the Sagittarius dwarf tidal stream and the Virgo and Pisces overdensities in the halo, and the Monoceros stream closer to the Galactic plane. These recent developments have made it clear that the Milky Way is a complex and dynamic structure, one that is still being shaped by the merging of neighboring smaller galaxies. Here we summarize developments over the last decade in our mapping of the stellar content of the Milky Way, as well as recent attempts to map the dark matter halo by Loebman et al. (2012) and ISM dust distribution by Berry et al. (2012). We also briefly discuss the next generation of wide-field sky surveys, exemplified by Gaia and LSST, which will improve measurement precision manyfold, and comprise billions of individual stars.

Fast active optics control of wide-field telescopes based on science image analysis

2014 ◽  
Author(s):  
R. Holzlöhner ◽  
A. Rakich ◽  
L. Noethe ◽  
K. Kuijken ◽  
P. Schipani
Keyword(s):  
Image Analysis ◽  
Wide Field ◽  
Active Optics

scholarly journals Image Detection, Characterization and Classification, and the Future Role of CCDS in Wide-Field Astrometry

1994 ◽  
Vol 161 ◽  
pp. 193-203 ◽  
Author(s):  
W.F. van Altena
Keyword(s):  
Wide Field ◽  
Intensive Study ◽  
Schmidt Telescope ◽  
Direct Imaging ◽  
Image Detection ◽  
Sky Surveys ◽  
Future Role ◽  
The Subject ◽  
Photographic Emulsions

The extraction and characterisation of information from photographic emulsions is the subject of this review. Since the major Schmidt Telescope full sky surveys form the bulk of the photographic emulsions currently under intensive study, I will limit my remarks to them, although most would be applicable to any of the emulsions now in use. A listing of the major direct imaging surveys is given in the article by van Altena et al (1993).

Infrared Wide-Field Surveys

1994 ◽  
Vol 161 ◽  
pp. 13-16
Author(s):  
N. Epchtein
Keyword(s):  
Near Infrared ◽  
Wide Field ◽  
Field Surveys ◽  
Sky Surveys ◽  
The Past ◽  
Infrared Spectral Range ◽  
Sky Survey ◽  
Array Technology ◽  
Infrared Spectral ◽  
Infrared Array

Optical wide-field sky surveys have long been basic tools of astronomical investigations. Their extension to the near infrared spectral range, unattainable with photographic techniques, is now possible thanks to the considerable improvements in infrared array technology that have been achieved in the past few years. The astronomical motivations for all-sky 2 μm surveys are summarized, and a brief technical description of the on-going projects, in particular DENIS (Deep Near Infrared Southern Sky Survey) that will be carried out at the European Southern Observatory in 1994–97, is presented.

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