PittsburghV1, France, Analysis, bibRecord, 000733

Precision photometric redshift calibration for galaxy-galaxy weak lensing

Identifieur interne : 000733 ( France/Analysis ); précédent : 000732; suivant : 000734

Precision photometric redshift calibration for galaxy-galaxy weak lensing

Auteurs : R. Mandelbaum ; U. Seljak ; C. M. Hirata ; S. Bardelli [Italie] ; M. Bolzonella [France] ; A. Bongiorno [France] ; M. Carollo ; T. Contini [France] ; C. E. Cunha ; B. Garilli [Italie] ; A. Iovino [Italie] ; P. Kampczyk ; J.-P. Kneib [France] ; C. Knobel ; D. C. Koo ; F. Lamareille [France] ; O. Le Fèvre [France] ; J.-F. Leborgne [France] ; S. J. Lilly ; C. Maier ; V. Mainieri ; M. Mignoli ; J. A. Newman ; P. A. Oesch ; E. Perez-Montero ; E. Ricciardelli ; M. Scodeggio [Italie] ; J. Silverman [États-Unis] ; L. Tasca [France]

Source :

Monthly Notices of the Royal Astronomical Society [ 0035-8711 ] ; 2008-05.

RBID : Hal:hal-00287327

English descriptors

mix :
- galaxies: distances and redshifts, gravitational lensing.

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. Based in part on observations undertaken at the European Southern Observatory (ESO) Very Large Telescope (VLT) under Large Programme 175.A-0839. E-mail: rmandelb@ias.edu (RM); seljak@itp.uzh.ch (US) ? Hubble Fellow.

Url:

https://hal.archives-ouvertes.fr/hal-00287327

DOI: 10.1111/J.1365-2966.2008.12947.X

Affiliations:

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Le document en format XML

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<sourceDesc><biblStruct><analytic><title xml:lang="en">Precision photometric redshift calibration for galaxy-galaxy weak lensing</title>
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<author><name sortKey="Seljak, U" sort="Seljak, U" uniqKey="Seljak U" first="U." last="Seljak">U. Seljak</name>
</author>
<author><name sortKey="Hirata, C M" sort="Hirata, C M" uniqKey="Hirata C" first="C. M." last="Hirata">C. M. Hirata</name>
</author>
<author><name sortKey="Bardelli, S" sort="Bardelli, S" uniqKey="Bardelli S" first="S." last="Bardelli">S. Bardelli</name>
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          <orgName type="acronym">INAF</orgName>
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</affiliation>
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</affiliation>
</author>
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<author><name sortKey="Carollo, M" sort="Carollo, M" uniqKey="Carollo M" first="M." last="Carollo">M. Carollo</name>
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<author><name sortKey="Contini, T" sort="Contini, T" uniqKey="Contini T" first="T." last="Contini">T. Contini</name>
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<author><name sortKey="Cunha, C E" sort="Cunha, C E" uniqKey="Cunha C" first="C. E." last="Cunha">C. E. Cunha</name>
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<author><name sortKey="Garilli, B" sort="Garilli, B" uniqKey="Garilli B" first="B." last="Garilli">B. Garilli</name>
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<author><name sortKey="Iovino, A" sort="Iovino, A" uniqKey="Iovino A" first="A." last="Iovino">A. Iovino</name>
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</affiliation>
</author>
<author><name sortKey="Kampczyk, P" sort="Kampczyk, P" uniqKey="Kampczyk P" first="P." last="Kampczyk">P. Kampczyk</name>
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<author><name sortKey="Kneib, J P" sort="Kneib, J P" uniqKey="Kneib J" first="J.-P." last="Kneib">J.-P. Kneib</name>
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<author><name sortKey="Knobel, C" sort="Knobel, C" uniqKey="Knobel C" first="C." last="Knobel">C. Knobel</name>
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<author><name sortKey="Koo, D C" sort="Koo, D C" uniqKey="Koo D" first="D. C." last="Koo">D. C. Koo</name>
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<author><name sortKey="Lamareille, F" sort="Lamareille, F" uniqKey="Lamareille F" first="F." last="Lamareille">F. Lamareille</name>
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<author><name sortKey="Tasca, L" sort="Tasca, L" uniqKey="Tasca L" first="L." last="Tasca">L. Tasca</name>
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<country>France</country>
<placeName><settlement type="city">Marseille</settlement>
<region type="region" nuts="2">Provence-Alpes-Côte d'Azur</region>
</placeName>
<orgName type="university">Université d'Aix-Marseille</orgName>
</affiliation>
</author>
</analytic>
<idno type="DOI">10.1111/J.1365-2966.2008.12947.X</idno>
<series><title level="j">Monthly Notices of the Royal Astronomical Society</title>
<idno type="ISSN">0035-8711</idno>
<imprint><date type="datePub">2008-05</date>
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<profileDesc><textClass><keywords scheme="mix" xml:lang="en"><term>galaxies: distances and redshifts</term>
<term>gravitational lensing</term>
</keywords>
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</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. Based in part on observations undertaken at the European Southern Observatory (ESO) Very Large Telescope (VLT) under Large Programme 175.A-0839. E-mail: rmandelb@ias.edu (RM); seljak@itp.uzh.ch (US) ? Hubble Fellow.</div>
</front>
</TEI>
<affiliations><list><country><li>France</li>
<li>Italie</li>
<li>États-Unis</li>
</country>
<region><li>Provence-Alpes-Côte d'Azur</li>
</region>
<settlement><li>Marseille</li>
</settlement>
<orgName><li>Université d'Aix-Marseille</li>
</orgName>
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<tree><noCountry><name sortKey="Carollo, M" sort="Carollo, M" uniqKey="Carollo M" first="M." last="Carollo">M. Carollo</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="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="Koo, D C" sort="Koo, D C" uniqKey="Koo D" first="D. C." last="Koo">D. C. Koo</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="Mainieri, V" sort="Mainieri, V" uniqKey="Mainieri V" first="V." last="Mainieri">V. Mainieri</name>
<name sortKey="Mandelbaum, R" sort="Mandelbaum, R" uniqKey="Mandelbaum R" first="R." last="Mandelbaum">R. Mandelbaum</name>
<name sortKey="Mignoli, M" sort="Mignoli, M" uniqKey="Mignoli M" first="M." last="Mignoli">M. Mignoli</name>
<name sortKey="Newman, J A" sort="Newman, J A" uniqKey="Newman J" first="J. A." last="Newman">J. A. Newman</name>
<name sortKey="Oesch, P A" sort="Oesch, P A" uniqKey="Oesch P" first="P. A." last="Oesch">P. A. Oesch</name>
<name sortKey="Perez Montero, E" sort="Perez Montero, E" uniqKey="Perez Montero E" first="E." last="Perez-Montero">E. Perez-Montero</name>
<name sortKey="Ricciardelli, E" sort="Ricciardelli, E" uniqKey="Ricciardelli E" first="E." last="Ricciardelli">E. Ricciardelli</name>
<name sortKey="Seljak, U" sort="Seljak, U" uniqKey="Seljak U" first="U." last="Seljak">U. Seljak</name>
</noCountry>
<country name="Italie"><noRegion><name sortKey="Bardelli, S" sort="Bardelli, S" uniqKey="Bardelli S" first="S." last="Bardelli">S. Bardelli</name>
</noRegion>
<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="Scodeggio, M" sort="Scodeggio, M" uniqKey="Scodeggio M" first="M." last="Scodeggio">M. Scodeggio</name>
</country>
<country name="France"><noRegion><name sortKey="Bolzonella, M" sort="Bolzonella, M" uniqKey="Bolzonella M" first="M." last="Bolzonella">M. Bolzonella</name>
</noRegion>
<name sortKey="Bongiorno, A" sort="Bongiorno, A" uniqKey="Bongiorno A" first="A." last="Bongiorno">A. Bongiorno</name>
<name sortKey="Contini, T" sort="Contini, T" uniqKey="Contini T" first="T." last="Contini">T. Contini</name>
<name sortKey="Kneib, J P" sort="Kneib, J P" uniqKey="Kneib J" first="J.-P." last="Kneib">J.-P. 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 F" sort="Leborgne, J F" uniqKey="Leborgne J" first="J.-F." last="Leborgne">J.-F. Leborgne</name>
<name sortKey="Tasca, L" sort="Tasca, L" uniqKey="Tasca L" first="L." last="Tasca">L. Tasca</name>
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<country name="États-Unis"><noRegion><name sortKey="Silverman, J" sort="Silverman, J" uniqKey="Silverman J" first="J." last="Silverman">J. Silverman</name>
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Precision photometric redshift calibration for galaxy-galaxy weak lensing

Precision photometric redshift calibration for galaxy-galaxy weak lensing

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