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H-ATLAS: PACS imaging for the Science Demonstration Phase E. Ibar et al. PACS data reduction.
- Source :
-
Monthly Notices of the Royal Astronomical Society . Nov2010, Vol. 409 Issue 1, p38-47. 10p. 3 Color Photographs, 1 Diagram, 2 Charts, 6 Graphs. - Publication Year :
- 2010
-
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 deg region using Herschel's fast-scan (60 arcsec s) parallel mode. We describe in detail a pipeline for data reduction using customized procedures within 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 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. [ABSTRACT FROM AUTHOR]
- Subjects :
- *DATA analysis
*IMAGE processing
*IONIZING radiation
*ASTRONOMY
*PHYSICAL sciences
Subjects
Details
- Language :
- English
- ISSN :
- 00358711
- Volume :
- 409
- Issue :
- 1
- Database :
- Academic Search Index
- Journal :
- Monthly Notices of the Royal Astronomical Society
- Publication Type :
- Academic Journal
- Accession number :
- 55088501
- Full Text :
- https://doi.org/10.1111/j.1365-2966.2010.17620.x