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Proceedings Paper

The Photodetector Array Camera and Spectrometer (PACS) for the Herschel Space Observatory
Author(s): Albrecht Poglitsch; Christoffel Waelkens; Otto H. Bauer; Jordi Cepa; Helmut Feuchtgruber; Thomas Henning; Chris van Hoof; Franz Kerschbaum; Oliver Krause; Etienne Renotte; Louis Rodriguez; Paolo Saraceno; Bart Vandenbussche
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Paper Abstract

The Photodetector Array Camera and Spectrometer (PACS) is one of the three science instruments for ESA's far infrared and submillimeter observatory Herschel. It employs two Ge:Ga photoconductor arrays (stressed and unstressed) with 16 × 25 pixels, each, and two filled silicon bolometer arrays with 16 × 32 and 32 × 64 pixels, respectively, to perform imaging line spectroscopy and imaging photometry in the 60 - 210μm wavelength band. In photometry mode, it will simultaneously image two bands, 60 - 85μm or 85 - 125μm and 125 - 210μm, over a field of view of ~ 1.75' × 3.5', with close to Nyquist beam sampling in each band. In spectroscopy mode, it will image a field of ~ 50" × 50", resolved into 5 × 5 pixels, with an instantaneous spectral coverage of ~ 1500 km/s and a spectral resolution of ~ 175 km/s. In both modes the performance is expected to be not far from background-noise limited, with sensitivities (5σ in 1h) of ~ 4 mJy or 3 - 20 × 10-18W/m2, respectively. We summarize the design of the instrument, describe the observing modes in combination with the telescope pointing modes, report results from instrument level performance tests and calibration of the Flight Model, and present our current prediction of the in-orbit performance of the instrument based on the ground tests.

Paper Details

Date Published: 12 July 2008
PDF: 12 pages
Proc. SPIE 7010, Space Telescopes and Instrumentation 2008: Optical, Infrared, and Millimeter, 701005 (12 July 2008); doi: 10.1117/12.790016
Show Author Affiliations
Albrecht Poglitsch, Max-Planck-Institut für extraterrestrische Physik (Germany)
Christoffel Waelkens, Katholieke Univ. Leuven (Belgium)
Otto H. Bauer, Max-Planck-Institut für extraterrestrische Physik (Germany)
Jordi Cepa, Instituto de Astrofisica de Canarias (Spain)
Helmut Feuchtgruber, Max-Planck-Institut für extraterrestrische Physik (Germany)
Thomas Henning, Max-Planck-Institut für Astronomie (Germany)
Chris van Hoof, Interuniversity Microelectronics Ctr. (Belgium)
Franz Kerschbaum, Institut für Astronomie der Univ. Wien (Austria)
Oliver Krause, Max-Planck-Institut für Astronomie (Germany)
Etienne Renotte, Ctr. Spatial de Liège (Belgium)
Louis Rodriguez, Commissariat à l'Energie Atomique (France)
Paolo Saraceno, Istituto di Fisica dello Spazio Interplanetario (Italy)
Bart Vandenbussche, Katholieke Univ. Leuven (Belgium)


Published in SPIE Proceedings Vol. 7010:
Space Telescopes and Instrumentation 2008: Optical, Infrared, and Millimeter
Jacobus M. Oschmann; Mattheus W. M. de Graauw; Howard A. MacEwen, Editor(s)

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