Journal
ASTRONOMY & ASTROPHYSICS
Volume 518, Issue -, Pages -Publisher
EDP SCIENCES S A
DOI: 10.1051/0004-6361/201014535
Keywords
space vehicles: instruments; instrumentation: photometers; instrumentation: spectrographs
Categories
Funding
- BMVIT (Austria)
- ESA-PRODEX (Belgium)
- CEA/CNES (France)
- DLR (Germany)
- ASI/INAF (Italy)
- CICYT/MCYT (Spain)
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The Photodetector Array Camera and Spectrometer (PACS) is one of the three science instruments on ESA's far infrared and submillimetre observatory. It employs two Ge:Ga photoconductor arrays (stressed and unstressed) with 16 x 25 pixels, each, and two filled silicon bolometer arrays with 16 x 32 and 32 x 64 pixels, respectively, to perform integral-field spectroscopy and imaging photometry in the 60-210 mu m wavelength regime. In photometry mode, it simultaneously images two bands, 60-85 mu m or 85-125 mu m and 125-210 mu m, over a field of view of similar to 1.75' x 3.5', with close to Nyquist beam sampling in each band. In spectroscopy mode, it images a field of 47 '' x 47 '', resolved into 5 x 5 pixels, with an instantaneous spectral coverage of similar to 1500 km s(-1) and a spectral resolution of similar to 175 km s(-1). We summarise the design of the instrument, describe observing modes, calibration, and data analysis methods, and present our current assessment of the in-orbit performance of the instrument based on the performance verification tests. PACS is fully operational, and the achieved performance is close to or better than the pre-launch predictions.
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