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H-ATLAS: PACS imaging for the Science Demonstration Phase

Ibar, Edo and Frayer, D. (2010) H-ATLAS: PACS imaging for the Science Demonstration Phase. Monthly Notices of the Royal Astronomical Society, 409 (1). pp. 38-47. ISSN 0035-8711.

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We describe the reduction of data taken with the PACS instrument on board the Herschel Space Observatory in the Science Demonstration Phase of the Herschel-ATLAS (H-ATLAS) survey, specifically data obtained for a 4 × 4 deg^2 region using Herschel's fast-scan (60 arcsec s^(−1)) parallel mode. We describe in detail a pipeline for data reduction using customized procedures within hipe from data retrieval to the production of science-quality images. We found that the standard procedure for removing cosmic ray glitches also removed parts of bright sources and so implemented an effective two-stage process to minimize these problems. The pronounced 1/f noise is removed from the timelines using 3.4- and 2.5-arcmin boxcar high-pass filters at 100 and 160 μm. Empirical measurements of the point spread function (PSF) are used to determine the encircled energy fraction as a function of aperture size. For the 100- and 160-μm bands, the effective PSFs are ~9 and ~13 arcsec (FWHM), and the 90-per cent encircled energy radii are 13 and 18 arcsec. Astrometric accuracy is good to ≲2 arcsec. The noise in the final maps is correlated between neighbouring pixels and rather higher than advertised prior to launch. For a pair of cross-scans, the 5σ point-source sensitivities are 125–165 mJy for 9–13 arcsec radius apertures at 100 μm and 150–240 mJy for 13–18 arcsec radius apertures at 160 μm.

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Additional Information:© 2010 The Authors. Journal compilation © 2010 RAS. Accepted 2010 August 27. Received 2010 August 26; in original form 2010 June 8. Article first published online: 19 Oct. 2010. PACS has been developed by a consortium of institutes led by MPE (Germany) and including UVIE (Austria); KU Leuven, CSL, IMEC (Belgium); CEA, LAM (France); MPIA (Germany); INAFIFSI/ OAA/OAP/OAT, LENS, SISSA (Italy) and IAC (Spain). This development has been supported by the funding agencies BMVIT (Austria), ESA-PRODEX (Belgium), CEA/CNES (France), DLR (Germany), ASI/INAF (Italy) and CICYT/MCYT (Spain). We would like to thank the PACS–ICC team for providing excellent support to the H-ATLAS project and for the various HIPE developments that comprise the current pipeline. Finally, we thank the referee for comments that significantly improved this paper.
Funding AgencyGrant Number
Bundesministerium für Verkehr, Innovation und Technologie (BMVIT) (Austria)UNSPECIFIED
European Space Agency (ESA) PROgramme for the Development of scientific Experiments (PRODEX) (Belgium)UNSPECIFIED
Commissariat à l'Énergie Atomique/Centre National de la Recherche Scientifique (CEA/CNES)UNSPECIFIED
Deutschland für Luft- und Raumfahrt (DLR) (Germany)UNSPECIFIED
Agenzia Spaziale Italiana/Istituto Nazionale di Astrofisica (ASI/INAF) (Italy)UNSPECIFIED
Comisión Interministerial de Ciencia y Tecnología/Ministerio de Ciencia Y Tecnologia (CICT/MCYT) (Spain)UNSPECIFIED
Subject Keywords:methods: data analysis/ techniques: image processing/ surveys
Issue or Number:1
Record Number:CaltechAUTHORS:20101220-114013525
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Official Citation:Ibar, E., Ivison, R. J., Cava, A., Rodighiero, G., Buttiglione, S., Temi, P., Frayer, D., Fritz, J., Leeuw, L., Baes, M., Rigby, E., Verma, A., Serjeant, S., Müller, T., Auld, R., Dariush, A., Dunne, L., Eales, S., Maddox, S., Panuzzo, P., Pascale, E., Pohlen, M., Smith, D., Zotti, G. d., Vaccari, M., Hopwood, R., Cooray, A., Burgarella, D. and Jarvis, M. (2010), H-ATLAS: PACS imaging for the Science Demonstration Phase. Monthly Notices of the Royal Astronomical Society, 409: 38–47. doi: 10.1111/j.1365-2966.2010.17620.x
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:21441
Deposited By: Jason Perez
Deposited On:23 Dec 2010 16:02
Last Modified:03 Oct 2019 02:24

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