Precision photometric redshift calibration for galaxy–galaxy weak lensing
Identifieur interne : 000186 ( Main/Exploration ); précédent : 000185; suivant : 000187Precision photometric redshift calibration for galaxy–galaxy weak lensing
Auteurs : R. Mandelbaum [États-Unis, Suisse] ; U. Seljak [Suisse, États-Unis] ; C. M. Hirata [États-Unis] ; S. Bardelli [Italie] ; M. Bolzonella [Italie] ; A. Bongiorno [Italie] ; M. Carollo [Suisse] ; T. Contini [France] ; C. E. Cunha [États-Unis] ; B. Garilli [Italie] ; A. Iovino [Italie] ; P. Kampczyk [Suisse] ; J. Kneib [France] ; C. Knobel [Suisse] ; D. C. Koo [États-Unis] ; F. Lamareille [France] ; O. Le Fèvre [France] ; J. Leborgne [France] ; S. J. Lilly [Suisse] ; C. Maier [Suisse] ; V. Mainieri [Allemagne] ; M. Mignoli [Italie] ; J. A. Newman [États-Unis] ; P. A. Oesch [Suisse] ; E. Perez-Montero [France] ; E. Ricciardelli [Italie] ; M. Scodeggio [États-Unis] ; J. Silverman [Allemagne] ; L. Tasca [France]Source :
- Monthly Notices of the Royal Astronomical Society [ 0035-8711 ] ; 2008-05-11.
English descriptors
Abstract
Accurate photometric redshifts are among the key requirements for precision weak lensing measurements. Both the large size of the Sloan Digital Sky Survey (SDSS) and the existence of large spectroscopic redshift samples that are flux‐limited beyond its depth have made it the optimal data source for developing methods to properly calibrate photometric redshifts for lensing. Here, we focus on galaxy–galaxy lensing in a survey with spectroscopic lens redshifts, as in the SDSS. We develop statistics that quantify the effect of source redshift errors on the lensing calibration and on the weighting scheme, and show how they can be used in the presence of redshift failure and sampling variance. We then demonstrate their use with 2838 source galaxies with spectroscopy from DEEP2 and zCOSMOS, evaluating several public photometric redshift algorithms, in two cases including a full p(z) for each object, and find lensing calibration biases as low as <1 per cent (due to fortuitous cancellation of two types of bias) or as high as 20 per cent for methods in active use (despite the small mean photoz bias of these algorithms). Our work demonstrates that lensing‐specific statistics must be used to reliably calibrate the lensing signal, due to asymmetric effects of (frequently non‐Gaussian) photoz errors. We also demonstrate that large‐scale structure (LSS) can strongly impact the photoz calibration and its error estimation, due to a correlation between the LSS and the photoz errors, and argue that at least two independent degree‐scale spectroscopic samples are needed to suppress its effects. Given the size of our spectroscopic sample, we can reduce the galaxy–galaxy lensing calibration error well below current SDSS statistical errors.
Url:
DOI: 10.1111/j.1365-2966.2008.12947.x
Affiliations:
- Allemagne, France, Italie, Suisse, États-Unis
- Canton de Zurich, Lombardie, Midi-Pyrénées, Occitanie (région administrative), Pennsylvanie, Vénétie, Émilie-Romagne
- Bologne, Milan, Padoue, Pittsburgh, Toulouse, Zurich
- Université de Bologne, Université de Padoue, Université de Pittsburgh, Université de Zurich
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Le Fèvre</name><affiliation wicri:level="1"><country xml:lang="fr">France</country><wicri:regionArea>Laboratoire d'Astrophysique de Marseille</wicri:regionArea></affiliation></author><author><name sortKey="Leborgne, J" sort="Leborgne, J" uniqKey="Leborgne J" first="J." last="Leborgne">J. Leborgne</name><affiliation wicri:level="3"><country xml:lang="fr">France</country><wicri:regionArea>Laboratoire d'Astrophysique de l'Observatoire Midi‐Pyrénées, Toulouse</wicri:regionArea><placeName><region type="region">Occitanie (région administrative)</region><region type="old region">Midi-Pyrénées</region><settlement type="city">Toulouse</settlement></placeName></affiliation></author><author><name sortKey="Lilly, S J" sort="Lilly, S J" uniqKey="Lilly S" first="S. J." last="Lilly">S. J. Lilly</name><affiliation wicri:level="1"><country xml:lang="fr">Suisse</country><wicri:regionArea>Institute of Astronomy, Department of Physics, ETH Zurich, CH‐8093</wicri:regionArea><wicri:noRegion>CH‐8093</wicri:noRegion></affiliation></author><author><name sortKey="Maier, C" sort="Maier, C" uniqKey="Maier C" first="C." last="Maier">C. Maier</name><affiliation wicri:level="1"><country xml:lang="fr">Suisse</country><wicri:regionArea>Institute of Astronomy, Department of Physics, ETH Zurich, CH‐8093</wicri:regionArea><wicri:noRegion>CH‐8093</wicri:noRegion></affiliation></author><author><name sortKey="Mainieri, V" sort="Mainieri, V" uniqKey="Mainieri V" first="V." last="Mainieri">V. Mainieri</name><affiliation wicri:level="1"><country xml:lang="fr">Allemagne</country><wicri:regionArea>European Southern Observatory, Garching</wicri:regionArea><wicri:noRegion>Garching</wicri:noRegion><wicri:noRegion>Garching</wicri:noRegion></affiliation></author><author><name sortKey="Mignoli, M" sort="Mignoli, M" uniqKey="Mignoli M" first="M." last="Mignoli">M. Mignoli</name><affiliation wicri:level="4"><country xml:lang="fr">Italie</country><wicri:regionArea>Dipartimento di Astronomia, Università degli Studi di Bologna, Bologna</wicri:regionArea><orgName type="university">Université de Bologne</orgName><placeName><settlement type="city">Bologne</settlement><region nuts="2" type="region">Émilie-Romagne</region></placeName></affiliation></author><author><name sortKey="Newman, J A" sort="Newman, J A" uniqKey="Newman J" first="J. A." last="Newman">J. A. Newman</name><affiliation wicri:level="4"><country xml:lang="fr">États-Unis</country><wicri:regionArea>Physics and Astronomy Department, University of Pittsburgh, Pittsburgh, PA 15260</wicri:regionArea><orgName type="university">Université de Pittsburgh</orgName><placeName><settlement type="city">Pittsburgh</settlement><region type="state">Pennsylvanie</region></placeName></affiliation></author><author><name sortKey="Oesch, P A" sort="Oesch, P A" uniqKey="Oesch P" first="P. A." last="Oesch">P. A. Oesch</name><affiliation wicri:level="1"><country xml:lang="fr">Suisse</country><wicri:regionArea>Institute of Astronomy, Department of Physics, ETH Zurich, CH‐8093</wicri:regionArea><wicri:noRegion>CH‐8093</wicri:noRegion></affiliation></author><author><name sortKey="Perez Ontero, E" sort="Perez Ontero, E" uniqKey="Perez Ontero E" first="E." last="Perez-Montero">E. Perez-Montero</name><affiliation wicri:level="3"><country xml:lang="fr">France</country><wicri:regionArea>Laboratoire d'Astrophysique de l'Observatoire Midi‐Pyrénées, Toulouse</wicri:regionArea><placeName><region type="region">Occitanie (région administrative)</region><region type="old region">Midi-Pyrénées</region><settlement type="city">Toulouse</settlement></placeName></affiliation></author><author><name sortKey="Ricciardelli, E" sort="Ricciardelli, E" uniqKey="Ricciardelli E" first="E." last="Ricciardelli">E. Ricciardelli</name><affiliation wicri:level="4"><country xml:lang="fr">Italie</country><wicri:regionArea>Dipartimento di Astronomia, Universita di Padova, Padova</wicri:regionArea><orgName type="university">Université de Padoue</orgName><placeName><settlement type="city">Padoue</settlement><region type="region" nuts="2">Vénétie</region></placeName></affiliation></author><author><name sortKey="Scodeggio, M" sort="Scodeggio, M" uniqKey="Scodeggio M" first="M." last="Scodeggio">M. Scodeggio</name><affiliation wicri:level="1"><country xml:lang="fr">États-Unis</country><wicri:regionArea>Department of Astronomy and Astrophysics, University of Chicago, Chicago, IL 60637</wicri:regionArea><wicri:noRegion>IL 60637</wicri:noRegion></affiliation></author><author><name sortKey="Silverman, J" sort="Silverman, J" uniqKey="Silverman J" first="J." last="Silverman">J. Silverman</name><affiliation wicri:level="1"><country xml:lang="fr">Allemagne</country><wicri:regionArea>Max‐Planck‐Institut für Extraterrestrische Physik, Garching</wicri:regionArea><wicri:noRegion>Garching</wicri:noRegion><wicri:noRegion>Garching</wicri:noRegion></affiliation></author><author><name sortKey="Tasca, L" sort="Tasca, L" uniqKey="Tasca L" first="L." last="Tasca">L. Tasca</name><affiliation wicri:level="1"><country xml:lang="fr">France</country><wicri:regionArea>Laboratoire d'Astrophysique de Marseille</wicri:regionArea></affiliation></author></analytic><monogr></monogr><series><title level="j">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="2008-05-11">2008-05-11</date><biblScope unit="volume">386</biblScope><biblScope unit="issue">2</biblScope><biblScope unit="page" from="781">781</biblScope><biblScope unit="page" to="806">806</biblScope></imprint><idno type="ISSN">0035-8711</idno></series><idno type="istex">D4C919C5993C829A58D773F34D6EFB07769C9F89</idno><idno type="DOI">10.1111/j.1365-2966.2008.12947.x</idno><idno type="ArticleID">MNR12947</idno></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0035-8711</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>galaxies: distances and redshifts</term><term>gravitational lensing</term></keywords></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Accurate photometric redshifts are among the key requirements for precision weak lensing measurements. Both the large size of the Sloan Digital Sky Survey (SDSS) and the existence of large spectroscopic redshift samples that are flux‐limited beyond its depth have made it the optimal data source for developing methods to properly calibrate photometric redshifts for lensing. Here, we focus on galaxy–galaxy lensing in a survey with spectroscopic lens redshifts, as in the SDSS. We develop statistics that quantify the effect of source redshift errors on the lensing calibration and on the weighting scheme, and show how they can be used in the presence of redshift failure and sampling variance. We then demonstrate their use with 2838 source galaxies with spectroscopy from DEEP2 and zCOSMOS, evaluating several public photometric redshift algorithms, in two cases including a full p(z) for each object, and find lensing calibration biases as low as <1 per cent (due to fortuitous cancellation of two types of bias) or as high as 20 per cent for methods in active use (despite the small mean photoz bias of these algorithms). Our work demonstrates that lensing‐specific statistics must be used to reliably calibrate the lensing signal, due to asymmetric effects of (frequently non‐Gaussian) photoz errors. We also demonstrate that large‐scale structure (LSS) can strongly impact the photoz calibration and its error estimation, due to a correlation between the LSS and the photoz errors, and argue that at least two independent degree‐scale spectroscopic samples are needed to suppress its effects. Given the size of our spectroscopic sample, we can reduce the galaxy–galaxy lensing calibration error well below current SDSS statistical errors.</div></front></TEI><affiliations><list><country><li>Allemagne</li><li>France</li><li>Italie</li><li>Suisse</li><li>États-Unis</li></country><region><li>Canton de Zurich</li><li>Lombardie</li><li>Midi-Pyrénées</li><li>Occitanie (région administrative)</li><li>Pennsylvanie</li><li>Vénétie</li><li>Émilie-Romagne</li></region><settlement><li>Bologne</li><li>Milan</li><li>Padoue</li><li>Pittsburgh</li><li>Toulouse</li><li>Zurich</li></settlement><orgName><li>Université de Bologne</li><li>Université de Padoue</li><li>Université de Pittsburgh</li><li>Université de Zurich</li></orgName></list><tree><country name="États-Unis"><noRegion><name sortKey="Mandelbaum, R" sort="Mandelbaum, R" uniqKey="Mandelbaum R" first="R." last="Mandelbaum">R. Mandelbaum</name></noRegion><name sortKey="Cunha, C E" sort="Cunha, C E" uniqKey="Cunha C" first="C. E." last="Cunha">C. E. Cunha</name><name sortKey="Cunha, C E" sort="Cunha, C E" uniqKey="Cunha C" first="C. E." last="Cunha">C. E. Cunha</name><name sortKey="Hirata, C M" sort="Hirata, C M" uniqKey="Hirata C" first="C. M." last="Hirata">C. M. Hirata</name><name sortKey="Koo, D C" sort="Koo, D C" uniqKey="Koo D" first="D. C." last="Koo">D. C. Koo</name><name sortKey="Newman, J A" sort="Newman, J A" uniqKey="Newman J" first="J. A." last="Newman">J. A. Newman</name><name sortKey="Scodeggio, M" sort="Scodeggio, M" uniqKey="Scodeggio M" first="M." last="Scodeggio">M. Scodeggio</name><name sortKey="Seljak, U" sort="Seljak, U" uniqKey="Seljak U" first="U." last="Seljak">U. Seljak</name></country><country name="Suisse"><noRegion><name sortKey="Mandelbaum, R" sort="Mandelbaum, R" uniqKey="Mandelbaum R" first="R." last="Mandelbaum">R. Mandelbaum</name></noRegion><name sortKey="Carollo, M" sort="Carollo, M" uniqKey="Carollo M" first="M." last="Carollo">M. Carollo</name><name sortKey="Kampczyk, P" sort="Kampczyk, P" uniqKey="Kampczyk P" first="P." last="Kampczyk">P. Kampczyk</name><name sortKey="Knobel, C" sort="Knobel, C" uniqKey="Knobel C" first="C." last="Knobel">C. Knobel</name><name sortKey="Lilly, S J" sort="Lilly, S J" uniqKey="Lilly S" first="S. J." last="Lilly">S. J. Lilly</name><name sortKey="Maier, C" sort="Maier, C" uniqKey="Maier C" first="C." last="Maier">C. Maier</name><name sortKey="Oesch, P A" sort="Oesch, P A" uniqKey="Oesch P" first="P. A." last="Oesch">P. A. Oesch</name><name sortKey="Seljak, U" sort="Seljak, U" uniqKey="Seljak U" first="U." last="Seljak">U. Seljak</name><name sortKey="Seljak, U" sort="Seljak, U" uniqKey="Seljak U" first="U." last="Seljak">U. Seljak</name></country><country name="Italie"><noRegion><name sortKey="Bardelli, S" sort="Bardelli, S" uniqKey="Bardelli S" first="S." last="Bardelli">S. Bardelli</name></noRegion><name sortKey="Bolzonella, M" sort="Bolzonella, M" uniqKey="Bolzonella M" first="M." last="Bolzonella">M. Bolzonella</name><name sortKey="Bongiorno, A" sort="Bongiorno, A" uniqKey="Bongiorno A" first="A." last="Bongiorno">A. Bongiorno</name><name sortKey="Bongiorno, A" sort="Bongiorno, A" uniqKey="Bongiorno A" first="A." last="Bongiorno">A. Bongiorno</name><name sortKey="Garilli, B" sort="Garilli, B" uniqKey="Garilli B" first="B." last="Garilli">B. Garilli</name><name sortKey="Iovino, A" sort="Iovino, A" uniqKey="Iovino A" first="A." last="Iovino">A. Iovino</name><name sortKey="Mignoli, M" sort="Mignoli, M" uniqKey="Mignoli M" first="M." last="Mignoli">M. Mignoli</name><name sortKey="Ricciardelli, E" sort="Ricciardelli, E" uniqKey="Ricciardelli E" first="E." last="Ricciardelli">E. Ricciardelli</name></country><country name="France"><region name="Occitanie (région administrative)"><name sortKey="Contini, T" sort="Contini, T" uniqKey="Contini T" first="T." last="Contini">T. Contini</name></region><name sortKey="Kneib, J" sort="Kneib, J" uniqKey="Kneib J" first="J." last="Kneib">J. Kneib</name><name sortKey="Lamareille, F" sort="Lamareille, F" uniqKey="Lamareille F" first="F." last="Lamareille">F. Lamareille</name><name sortKey="Le Fevre, O" sort="Le Fevre, O" uniqKey="Le Fevre O" first="O." last="Le Fèvre">O. Le Fèvre</name><name sortKey="Leborgne, J" sort="Leborgne, J" uniqKey="Leborgne J" first="J." last="Leborgne">J. Leborgne</name><name sortKey="Perez Ontero, E" sort="Perez Ontero, E" uniqKey="Perez Ontero E" first="E." last="Perez-Montero">E. Perez-Montero</name><name sortKey="Tasca, L" sort="Tasca, L" uniqKey="Tasca L" first="L." last="Tasca">L. Tasca</name></country><country name="Allemagne"><noRegion><name sortKey="Mainieri, V" sort="Mainieri, V" uniqKey="Mainieri V" first="V." last="Mainieri">V. Mainieri</name></noRegion><name sortKey="Silverman, J" sort="Silverman, J" uniqKey="Silverman J" first="J." last="Silverman">J. Silverman</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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