Difference imaging photometry of blended gravitational microlensing events with a numerical kernel
Identifieur interne : 001E88 ( Istex/Curation ); précédent : 001E87; suivant : 001E89Difference imaging photometry of blended gravitational microlensing events with a numerical kernel
Auteurs : M. D. Albrow [Nouvelle-Zélande] ; K. Horne ; D. M. Bramich [Espagne] ; P. Fouqué [France] ; V. R. Miller [Nouvelle-Zélande] ; J.-P. Beaulieu [France] ; C. Coutures [France] ; J. Menzies [Afrique du Sud] ; A. Williams [Australie] ; V. Batista [France] ; D. P. Bennett [États-Unis] ; S. Brillant [Chili] ; A. Cassan [Allemagne] ; S. Dieters [France] ; D. Dominis Prester [Croatie] ; J. Donatowicz [Autriche] ; J. Greenhill [Australie] ; N. Kains ; S. R. Kane [États-Unis] ; D. Kubas [Chili] ; J. B. Marquette [France] ; K. R. Pollard [Nouvelle-Zélande] ; K. C. Sahu [États-Unis] ; Y. Tsapras [États-Unis] ; J. Wambsganss [Allemagne] ; M. Zub [Allemagne]Source :
- Monthly Notices of the Royal Astronomical Society [ 0035-8711 ] ; 2009-08-21.
Abstract
The numerical kernel approach to difference imaging has been implemented and applied to gravitational microlensing events observed by the PLANET collaboration. The effect of an error in the source-star coordinates is explored and a new algorithm is presented for determining the precise coordinates of the microlens in blended events, essential for accurate photometry of difference images. It is shown how the photometric reference flux need not be measured directly from the reference image but can be obtained from measurements of the difference images combined with the knowledge of the statistical flux uncertainties. The improved performance of the new algorithm, relative to isis2, is demonstrated.
Url:
DOI: 10.1111/j.1365-2966.2009.15098.x
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<author><name sortKey="Sahu, K C" sort="Sahu, K C" uniqKey="Sahu K" first="K. C." last="Sahu">K. C. Sahu</name>
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<affiliation><mods:affiliation>Astrophysics Research Institute, Liverpool John Moores University, Liverpool CH41 1LD</mods:affiliation>
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<author><name sortKey="Wambsganss, J" sort="Wambsganss, J" uniqKey="Wambsganss J" first="J." last="Wambsganss">J. Wambsganss</name>
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<author><name sortKey="Zub, M" sort="Zub, M" uniqKey="Zub M" first="M." last="Zub">M. Zub</name>
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<series><title level="j">Monthly Notices of the Royal Astronomical Society</title>
<title level="j" type="abbrev">Monthly Notices of the Royal Astronomical Society</title>
<idno type="ISSN">0035-8711</idno>
<idno type="eISSN">1365-2966</idno>
<imprint><publisher>Blackwell Publishing Ltd</publisher>
<pubPlace>Oxford, UK</pubPlace>
<date type="published" when="2009-08-21">2009-08-21</date>
<biblScope unit="volume">397</biblScope>
<biblScope unit="issue">4</biblScope>
<biblScope unit="page" from="2099">2099</biblScope>
<biblScope unit="page" to="2105">2105</biblScope>
</imprint>
<idno type="ISSN">0035-8711</idno>
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<front><div type="abstract">The numerical kernel approach to difference imaging has been implemented and applied to gravitational microlensing events observed by the PLANET collaboration. The effect of an error in the source-star coordinates is explored and a new algorithm is presented for determining the precise coordinates of the microlens in blended events, essential for accurate photometry of difference images. It is shown how the photometric reference flux need not be measured directly from the reference image but can be obtained from measurements of the difference images combined with the knowledge of the statistical flux uncertainties. The improved performance of the new algorithm, relative to isis2, is demonstrated.</div>
</front>
</TEI>
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