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: | 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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