Correcting the extended-source calibration for the Herschel SPIRE Fourier-transform spectrometer

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dc.contributor.authorValtchanov, I.
dc.contributor.authorHopwood, R.
dc.contributor.authorBendo, G.
dc.contributor.authorBenson, Christopher S.
dc.contributor.authorConversi, L.
dc.contributor.authorFulton, T.
dc.contributor.authorGriffin, M. J.
dc.contributor.authorJoubaud, T.
dc.contributor.authorLim, T.
dc.contributor.authorLu, N.
dc.contributor.authorMarchili, N.
dc.contributor.authorMakiwa, G.
dc.contributor.authorMeyer, R. A.
dc.contributor.authorNaylor, David A.
dc.contributor.authorNorth, C.
dc.contributor.authorPapageorgiou, A.
dc.contributor.authorPearson, C.
dc.contributor.authorPolehampton, E. T.
dc.contributor.authorScott, Jeremy P.
dc.contributor.authorSchulz, B.
dc.contributor.authorSpencer, Locke Dean
dc.contributor.authorvan der Wiel, M. H. D.
dc.contributor.authorWu, R.
dc.date.accessioned2019-12-13T19:00:30Z
dc.date.available2019-12-13T19:00:30Z
dc.date.issued2017
dc.descriptionSherpa Romeo green journal. Permission to archive final published version.en_US
dc.description.abstractWe describe an update to the Herschel-Spectral and Photometric Imaging Receiver (SPIRE) Fourier-transform spectrometer (FTS) calibration for extended sources, which incorporates a correction for the frequency-dependent far-field feedhorn efficiency, ηff. This significant correction affects all FTS extended-source calibrated spectra in sparse or mapping mode, regardless of the spectral resolution. Line fluxes and continuum levels are underestimated by factors of 1.3–2 in the spectrometer long wavelength band (447–1018 GHz; 671–294 µm) and 1.4–1.5 in the spectrometer short wavelength band (944–1568 GHz; 318–191 µm). The correctionwasimplementedintheFTSpipelineversion14.1andhasalsobeendescribedinthe SPIRE Handbook since 2017 February. Studies based on extended-source calibrated spectra produced prior to this pipeline version should be critically reconsidered using the current products available in the Herschel Science Archive. Once the extended-source calibrated spectra are corrected for ηff, the synthetic photometry and the broad-band intensities from SPIRE photometer maps agree within 2–4percent – similar levels to the comparison of point-source calibrated spectra and photometry from point-source calibrated maps. The two calibration schemes for the FTS are now self-consistent: the conversion between the corrected extended-source and point-source calibrated spectra can be achieved with the beam solid angle and a gain correction that accounts for the diffraction loss.en_US
dc.description.peer-reviewYesen_US
dc.identifier.citationValtchanov, I., Hopwood, R., Bendo, G., Benson, C., Conversi, L., Fulton, T., ...Wu, R. (2017). Correcting the extended-source calibration for the Herschel-SPIRE Fourier-transform spectrometer. Monthly Notices of the Royal Astronomical Society, 475(1), 321-330. doi:10.1093/mnras/stx3178en_US
dc.identifier.urihttps://hdl.handle.net/10133/5631
dc.language.isoen_USen_US
dc.publisherOxford University Pressen_US
dc.publisher.departmentDepartment of Physics and Astronomyen_US
dc.publisher.facultyArts and Scienceen_US
dc.publisher.institutionEuropean Space Astronomy Centre (Spain)en_US
dc.publisher.institutionImperial College Londonen_US
dc.publisher.institutionUniversity of Manchesteren_US
dc.publisher.institutionUniversity of Lethbridgeen_US
dc.publisher.institutionBlue Sky Spectroscopyen_US
dc.publisher.institutionCardiff Universityen_US
dc.publisher.institutionRutherford Appleton Laboratoryen_US
dc.publisher.institutionUniversidad de Chileen_US
dc.publisher.institutionIAPS-INAFen_US
dc.publisher.institutionEcole Polytechnique Fédérale de Lausanneen_US
dc.publisher.institutionThe Open Universityen_US
dc.publisher.institutionUniversity of Oxforden_US
dc.publisher.institutionCalifornia Institute of Technologyen_US
dc.publisher.institutionASTRON, the Netherlands Institute for Radio Astronomyen_US
dc.publisher.institutionSorbonne Universitésen_US
dc.publisher.urlhttps://doi.org/10.1093/mnras/stx3178en_US
dc.subjectInstrumentationen_US
dc.subjectSpectographsen_US
dc.subjectSpace vehiclesen_US
dc.subjectInstruments - Techniquesen_US
dc.subjectSpectroscopicen_US
dc.titleCorrecting the extended-source calibration for the Herschel SPIRE Fourier-transform spectrometeren_US
dc.typeArticleen_US
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