ELTs, AO wavelengths, and science output

Arne Ardeberg; Peter Linde

doi:10.1117/12.789554

22 July 2008 ELTs, AO wavelengths, and science output

Arne Ardeberg, Peter Linde

Proceedings Volume 7012, Ground-based and Airborne Telescopes II; 70121G (2008) https://doi.org/10.1117/12.789554
Event: SPIE Astronomical Telescopes + Instrumentation, 2008, Marseille, France

Abstract

A study is presented of the impact on science data from extremely large telescopes of a transformation of wavelength base for optimization of actuator architecture from 2 200 to 1 250 nm. From the optical path difference (OPD) data for Euro50, we transform to E-ELT OPDs. We compute the corresponding power spectrum, in which we simulate a higher actuator density via high-pass filtering to convert from K to J band actuator-pitch optimization. From the modified power spectrum we derive the correspondingly modified OPDs, PSFs and Strehl ratios. A massive improvement is demonstrated resulting from converting from AO@K to AO@J. This result is followed up by model-based E-ELT imaging in a field in a galactic disc at a distance of 4 Mpc. The improvements in image quality, background and limiting magnitude are very large as are the increases in photometric precision derived from the field imaging. Further, the great science benefit and large opportunities provided by partial AO is demonstrated. In conclusion, while admittedly challenging, pushing AO optimization to wavelengths as short as possible is of prime concern for the science output of ELTs.

Citation Download Citation

Arne Ardeberg and Peter Linde "ELTs, AO wavelengths, and science output", Proc. SPIE 7012, Ground-based and Airborne Telescopes II, 70121G (22 July 2008); https://doi.org/10.1117/12.789554

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KEYWORDS

Actuators

Adaptive optics

Point spread functions

K band

Image quality

Photometry

Telescopes

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