University of Hertfordshire

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From the same journal

By the same authors

H-ATLAS : PACS imaging for the Science Demonstration Phase

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  • 904416.pdf

    Accepted author manuscript, 1.01 MB, PDF document

  • E. Ibar
  • R.J. Ivison
  • A. Cava
  • G. Rodighiero
  • S. Buttiglione
  • P. Temi
  • D. Frayer
  • J. Fritz
  • L. Leeuw
  • M. Baes
  • E. Rigby
  • A. Verma
  • S. Serjeant
  • T. Muller
  • R. Auld
  • A. Dariush
  • L. Dunne
  • S. Eales
  • S. Maddox
  • P. Panuzzo
  • E. Pascale
  • M. Pohlen
  • G. de Zotti
  • M. Vaccari
  • R. Hopwood
  • A. Cooray
  • D. Burgarella
  • M.J. Jarvis
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Original languageEnglish
Pages (from-to)38-47
JournalMonthly Notices of the Royal Astronomical Society
Publication statusPublished - 2010


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 deg2 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.


Original article can be found at : Copyright Royal Astronomical Society

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