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IMPALAS Fabry-Perot System

IMPALAS Fabry-Perot System. Full two-dimensional spectroscopic imaging 8’ (diameter) field of view seeing-limited spatial resolution Three spectral resolution modes 500 – 1000 2500 12500 25 km/s 5 km/s 1 km/s Wavelength range: 430 – 860 nm (continuous). Sensitivity.

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IMPALAS Fabry-Perot System

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  1. IMPALAS Fabry-Perot System • Full two-dimensional spectroscopic imaging • 8’ (diameter) field of view • seeing-limited spatial resolution • Three spectral resolution modes • 500 – 1000 2500 12500 • 25 km/s 5 km/s 1 km/s • Wavelength range: 430 – 860 nm (continuous)

  2. Sensitivity Exposure times for a single S/N = 10 per sample image Samples: Absorption 3x3 bp(0.78”) Emission 4x4 bp (1.0”) 9 – 15 exposures required for a typical datacube

  3. Etalons and Filters • Dual etalon system • R=500-1000: low resolution etalon + filter • R=2500: low + mid-resolution etalons + filter • R=12500: low + high-resolution etalons + filter • Etalon finesse 30 (FWHM / Order Separation) • – peak transmission ~ 80% • ~ 30 filters required

  4. Spectral Range • Users desire 350 – 900 nm range • Etalon coatings provide ~ 1 octave range • Science drivers • kinematics • emission: Hα (656.3 nm) or [OIII] (500.7 nm) • absorption: Hα, Ca (854.2 nm), Mg (518.3 nm) • nebular line analysis • [OIII] (495.9+500.7)/436.3, [NII] (654.8+658.3)/575.5 • [SII] 671.6/673.1 • H Balmer ratios: 656.3 486.1, 434.0

  5. Cosmology

  6. Choose 430 – 860 nm spectral range • satisfies largest number of users • supports almost all imaging science programs • Future upgrade • either: add blue etalon • or: strip & recoat existing etalon (60% cost) • in both cases: add blue filters

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