University of Hertfordshire

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  • 1712.02361v2

    Accepted author manuscript, 7.66 MB, PDF document

  • Matthew W. L. Smith
  • Edo Ibar
  • Steve J. Maddox
  • Elisabetta Valiante
  • Loretta Dunne
  • Stephen Eales
  • Simon Dye
  • Christina Furlanetto
  • Nathan Bourne
  • Phil Cigan
  • Rob J. Ivison
  • Haley Gomez
  • Daniel J. B. Smith
  • Sébastien Viaene
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Original languageEnglish
Article number26
JournalAstrophysical Journal, Supplement Series
Publication statusPublished - 21 Dec 2017


We present the largest submillimeter images that have been made of the extragalactic sky. The Herschel Astrophysical Terahertz Large Area Survey (H-ATLAS) is a survey of 660 deg$^2$ with the PACS and SPIRE cameras in five photometric bands: 100, 160, 250, 350, and 500{\mu}m. In this paper we present the images from our two largest fields which account for ~75% of the survey. The first field is 180.1 deg$^2$ in size centered on the North Galactic Pole (NGP) and the second field is 317.6 deg$^2$ in size centered on the South Galactic Pole. The NGP field serendipitously contains the Coma cluster. Over most (~80%) of the images, the pixel noise, including both instrumental noise and confusion noise, is approximately 3.6, and 3.5 mJy/pix at 100 and 160{\mu}m, and 11.0, 11.1 and 12.3 mJy/beam at 250, 350 and 500{\mu}m, respectively, but reaches lower values in some parts of the images. If a matched filter is applied to optimize point-source detection, our total 1{\sigma} map sensitivity is 5.7, 6.0, and 7.3 mJy at 250, 350, and 500{\mu}m, respectively. We describe the results of an investigation of the noise properties of the images. We make the most precise estimate of confusion in SPIRE maps to date finding values of 3.12+/-0.07, 4.13+/-0.02 and 4.45+/-0.04 mJy/beam at 250, 350, and 500{\mu}m in our un-convolved maps. For PACS we find an estimate of the confusion noise in our fast-parallel observations of 4.23 and 4.62 mJy/beam at 100 and 160{\mu}m. Finally, we give recipes for using these images to carry out photometry, both for unresolved and extended sources.


© 2018 The American Astronomical Society. All rights reserved. 6 Pages, 14 Figures. Submitted to ApJS July 2017, accepted November 2017

ID: 13067484