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- Title
Herschel SPIRE fourier transform spectrometer: calibration of its bright-source mode.
- Authors
Lu, Nanyao; Polehampton, Edward; Swinyard, Bruce; Benielli, Dominique; Fulton, Trevor; Hopwood, Rosalind; Imhof, Peter; Lim, Tanya; Marchili, Nicola; Naylor, David; Schulz, Bernhard; Sidher, Sunil; Valtchanov, Ivan
- Abstract
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.
- Subjects
FOURIER transform spectrometers; CALIBRATION; ASTRONOMICAL observations; BANDWIDTHS; ANALOG function generators; DETECTORS; WAVELENGTHS
- Publication
Experimental Astronomy, 2014, Vol 37, Issue 2, p239
- ISSN
0922-6435
- Publication type
Article
- DOI
10.1007/s10686-013-9359-9