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Proceedings Paper

ELTs adaptive optics for multi-objects 3D spectroscopy: key parameters and design rules
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Paper Abstract

In the last few years, new Adaptive Optics [AO] techniques have emerged to answer new astronomical challenges: Ground-Layer AO [GLAO] and Multi-Conjugate AO [MCAO] to access a wider Field of View [FoV], Multi-Object AO [MOAO] for the simultaneous observation of several faint galaxies, eXtreme AO [XAO] for the detection of faint companions. In this paper, we focus our study to one of these applications : high red-shift galaxy observations using MOAO techniques in the framework of Extremely Large Telescopes [ELTs]. We present the high-level specifications of a dedicated instrument. We choose to describe the scientific requirements with the following criteria : 40% of Ensquared Energy [EE] in H band (1.65μm) and in an aperture size from 25 to 150 mas. Considering these specifications we investigate different AO solutions thanks to Fourier based simulations. Sky Coverage [SC] is computed for Natural and Laser Guide Stars [NGS, LGS] systems. We show that specifications are met for NGS-based systems at the cost of an extremely low SC. For the LGS approach, the option of low order correction with a faint NGS is discussed. We demonstrate that, this last solution allows the scientific requirements to be met together with a quasi full SC.

Paper Details

Date Published: 28 June 2006
PDF: 13 pages
Proc. SPIE 6272, Advances in Adaptive Optics II, 62721X (28 June 2006); doi: 10.1117/12.671415
Show Author Affiliations
B. Neichel, ONERA (France)
GEPI, Observatoire de Paris (France)
J.-M. Conan, ONERA (France)
T. Fusco, ONERA (France)
E. Gendron, LESIA, Observatoire de Paris (France)
M. Puech, GEPI, Observatoire de Paris (France)
G. Rousset, LESIA, Observatoire de Paris (France)
ONERA (France)
F. Hammer, GEPI, Observatoire de Paris (France)


Published in SPIE Proceedings Vol. 6272:
Advances in Adaptive Optics II
Brent L. Ellerbroek; Domenico Bonaccini Calia, Editor(s)

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