H-ATLAS: PACS imaging for the Science Demonstration Phase

Ibar, Edo, 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, Robbie Richard, Dariush, Aliakbar, Dunne, L., Eales, Stephen Anthony ORCID: https://orcid.org/0000-0002-7394-426X, Maddox, S., Panuzzo, P., Pascale, Enzo ORCID: https://orcid.org/0000-0002-3242-8154, Pohlen, Michael, Smith, D., Zotti, G. de, 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 (1) , pp. 38-47. 10.1111/j.1365-2966.2010.17620.x

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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 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.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Physics and Astronomy
Subjects:	Q Science > QB Astronomy
Uncontrolled Keywords:	methods: data analysis; techniques: image processing; surveys
Additional Information:	Pdf uploaded in accordance with publisher's policy at http://www.sherpa.ac.uk/romeo/issn/0035-8711/ (accessed 20/02/2014).
Publisher:	Royal Astronomical Society
ISSN:	0035-8711
Date of First Compliant Deposit:	30 March 2016
Last Modified:	23 May 2023 21:04
URI:	https://orca.cardiff.ac.uk/id/eprint/20039

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