The Herschel–ATLAS data release 2, paper I. Submillimeter and far-infrared images of the south and north Galactic poles: the largest Herschel survey of the extragalactic sky

Smith, Matthew W. L. ORCID: https://orcid.org/0000-0002-3532-6970, Ibar, Edo, Maddox, Steve J. ORCID: https://orcid.org/0000-0001-5549-195X, Valiante, Elisabetta, Dunne, Loretta ORCID: https://orcid.org/0000-0001-9880-2543, Eales, Stephen ORCID: https://orcid.org/0000-0002-7394-426X, Dye, Simon, Furlanetto, Christina, Bourne, Nathan, Cigan, Phil, Ivison, Rob J., Gomez, Haley ORCID: https://orcid.org/0000-0003-3398-0052, Smith, Daniel J. B. ORCID: https://orcid.org/0000-0002-3532-6970 and Viaene, Sebastien 2017. The Herschel–ATLAS data release 2, paper I. Submillimeter and far-infrared images of the south and north Galactic poles: the largest Herschel survey of the extragalactic sky. Astrophysical Journal Supplement 233 (2) , 26. 10.3847/1538-4365/aa9b35

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Abstract

We present the largest submillimetre images that have been made of the extragalactic sky. The Herschel Astrophysical Terahertz Large Area Survey (H -ATLAS) is a survey of 660 deg2 with the PACS and SPIRE cameras in five photometric bands - 100, 160, 250, 350 and 500µm. 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 deg2 in size centred on the North Galactic Pole (NGP) and the second field is 317.6 deg2 in size centred 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 160µm, and 11.0, 11.1 and 12.3 mJy/beam at 250, 350 and 500µm, respectively, but reaches lower values in some parts of the images. If a matched-filter is applied to optimise pointsource detection, our total 1σ map sensitivity is 5.7, 6.0, 7.3 mJy at 250, 350 and 500µm, 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 500µm 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 160µm. Finally, we give recipes for using these images to carry out photometry, both for unresolved and extended sources.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Physics and Astronomy
Subjects:	Q Science > QB Astronomy
Publisher:	American Astronomical Society
ISSN:	0067-0049
Date of First Compliant Deposit:	16 November 2017
Date of Acceptance:	14 November 2017
Last Modified:	06 Nov 2024 12:30
URI:	https://orca.cardiff.ac.uk/id/eprint/106622

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