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5 March 2003 The Photodetector Array Camera & Spectrometer (PACS) for the Herschel Space Observatory
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The Photodetector Array Camera and Spectrometer (PACS) is one of the three science instruments for ESA's far infrared and submillimetre observatory, Herschel. It employs two Ge:Ga photoconductor arrays (stressed and unstressed) with 16 x 25 pixels, each, and two filled Si bolometer arrays with 16 x 32 and 32 x 64 pixels, respectively, to perform imaging line spectroscopy and imaging photometry in the 60-210 μm wavelength band. In photometry mode, it will simultaneously image two bands, 60-85 or 85-130 μm and 130-210 μm, over a field of view of ~1.75' x 3.5', with full beam sampling in each band. In spectroscopy mode, it will image a field of ~ 50", resolved into 5 x 5 pixels, with an instantaneous spectral coverage of ~1500 km/s and a spectral resolution of ~ 175km/s. In both modes background-noise limited performance is expected, with sensitivities (5σ in 1h) of ~ 3 mJy or 3-10x10-18W/m2, respectively.
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Albrecht Poglitsch, Christoffel Waelkens, and Norbert Geis "The Photodetector Array Camera & Spectrometer (PACS) for the Herschel Space Observatory", Proc. SPIE 4850, IR Space Telescopes and Instruments, (5 March 2003);

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