Reference : A deconvolution-based algorithm for crowded field photometry with unknown point sprea...
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Space science, astronomy & astrophysics
http://hdl.handle.net/2268/11837
A deconvolution-based algorithm for crowded field photometry with unknown point spread function
English
Magain, Pierre mailto [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique et traitement de l'image >]
Courbin, F. [École Polytechnique Fédérale de Lausanne (EPFL), Laboratoire d'Astrophysique, Observatoire, 1290 Sauverny, Switzerland]
Gillon, Michaël mailto [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique et traitement de l'image >]
Sohy, Sandrine mailto [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique et traitement de l'image >]
Letawe, Géraldine mailto [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Département d'astrophys., géophysique et océanographie (AGO) >]
Chantry, Virginie [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique et traitement de l'image >]
Letawe, Yannick mailto [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique et traitement de l'image >]
1-Jan-2007
Astronomy and Astrophysics
EDP Sciences
461
373-379
Yes (verified by ORBi)
International
0004-6361
1432-0746
Les Ulis
France
[en] techniques: image processing ; techniques: photometric
[en] A new method is presented for determining the point spread function (PSF) of images that lack bright and isolated stars. It is based on the same principles as the MCS image deconvolution algorithm. It uses the information contained in all stellar images to achieve the double task of reconstructing the PSFs for single or multiple exposures of the same field and to extract the photometry of all point sources in the field of view. The use of the full information available allows us to construct an accurate PSF. The possibility to simultaneously consider several exposures makes it well suited to the measurement of the light curves of blended point sources from data that would be very difficult or even impossible to analyse with traditional PSF fitting techniques. The potential of the method for the analysis of ground-based and space-based data is tested on artificial images and illustrated by several examples, including HST/NICMOS images of a lensed quasar and VLT/ISAAC images of a faint blended Mira star in the halo of the giant elliptical galaxy NGC 5128 (Cen A).
http://hdl.handle.net/2268/11837
also: http://hdl.handle.net/2268/11930
10.1051/0004-6361:20042505
http://adsabs.harvard.edu/abs/2007A%26A...461..373M
The authors thank EDP Sciences for their deposit authorisation
http://de.arxiv.org/abs/astro-ph/0609600

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