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Herschel SPIRE Fourier Transform Spectrometer: Calibration of its Bright-source Mode

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arxiv 1401.2045 v1 pith:A2TRB2FE submitted 2014-01-09 astro-ph.IM

Nanyao Lu , Edward T. Polehampton , Bruce M. Swinyard , Dominique Benielli , Trevor Fulton , Rosalind Hopwood , Peter Imhof , Tanya Lim
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Nicola Marchili David A. Naylor Bernhard Schulz Sunil Sidher Ivan Valtchanov
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keywords modebright-sourcenominalcalibrationspiredetectorfourierherschel
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The Fourier Transform Spectrometer (FTS) of the Spectral and Photometric Imaging REceiver (SPIRE) on board the ESA Herschel Space Observatory has two detector setting modes: (a) a nominal mode, which is optimized for observing moderately bright to faint astronomical targets, and (b) a bright-source mode recommended for sources significantly brighter than 500 Jy, within the SPIRE FTS bandwidth of 446.7-1544 GHz (or 194-671 microns in wavelength), which employs a reduced detector responsivity and out-of-phase analog signal amplifier/demodulator. We address in detail the calibration issues unique to the bright-source mode, describe the integration of the bright-mode data processing into the existing pipeline for the nominal mode, and show that the flux calibration accuracy of the bright-source mode is generally within 2% of that of the nominal mode, and that the bright-source mode is 3 to 4 times less sensitive than the nominal mode.

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