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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. https://resolver.caltech.edu/CaltechAUTHORS:20101220-114013525

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Abstract

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.


Item Type:Article
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http://dx.doi.org/10.1111/j.1365-2966.2010.17620.xDOIArticle
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.
Funders:
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
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20101220-114013525
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
Collection:CaltechAUTHORS
Deposited By: Jason Perez
Deposited On:23 Dec 2010 16:02
Last Modified:03 Oct 2019 02:24

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