Improved optical mass tracer for galaxy clusters calibrated using weak lensing measurements
Identifieur interne : 000192 ( Main/Exploration ); précédent : 000191; suivant : 000193Improved optical mass tracer for galaxy clusters calibrated using weak lensing measurements
Auteurs : R. Reyes [États-Unis] ; R. Mandelbaum [États-Unis] ; C. Hirata [États-Unis] ; N. Bahcall [États-Unis] ; U. Seljak [Suisse, États-Unis]Source :
- Monthly Notices of the Royal Astronomical Society [ 0035-8711 ] ; 2008-11-01.
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Abstract
We develop an improved mass tracer for clusters of galaxies from optically observed parameters, and calibrate the mass relation using weak gravitational lensing measurements. We employ a sample of ∼13 000 optically selected clusters from the Sloan Digital Sky Survey (SDSS) maxBCG catalogue, with photometric redshifts in the range 0.1–0.3. The optical tracers we consider are cluster richness, cluster luminosity, luminosity of the brightest cluster galaxy (BCG) and combinations of these parameters. We measure the weak lensing signal around stacked clusters as a function of the various tracers, and use it to determine the tracer with the least amount of scatter. We further use the weak lensing data to calibrate the mass normalization. We find that the best mass estimator for massive clusters is a combination of cluster richness, N200, and the luminosity of the BCG, LBCG: , where is the observed mean BCG luminosity at a given richness. This improved mass tracer will enable the use of galaxy clusters as a more powerful tool for constraining cosmological parameters.
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DOI: 10.1111/j.1365-2966.2008.13818.x
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We employ a sample of ∼13 000 optically selected clusters from the Sloan Digital Sky Survey (SDSS) maxBCG catalogue, with photometric redshifts in the range 0.1–0.3. The optical tracers we consider are cluster richness, cluster luminosity, luminosity of the brightest cluster galaxy (BCG) and combinations of these parameters. We measure the weak lensing signal around stacked clusters as a function of the various tracers, and use it to determine the tracer with the least amount of scatter. We further use the weak lensing data to calibrate the mass normalization. We find that the best mass estimator for massive clusters is a combination of cluster richness, N200, and the luminosity of the BCG, LBCG: , where is the observed mean BCG luminosity at a given richness. This improved mass tracer will enable the use of galaxy clusters as a more powerful tool for constraining cosmological parameters.</div></front></TEI><affiliations><list><country><li>Suisse</li><li>États-Unis</li></country><region><li>Canton de Zurich</li></region><settlement><li>Zurich</li></settlement><orgName><li>Université de Zurich</li></orgName></list><tree><country name="États-Unis"><noRegion><name sortKey="Reyes, R" sort="Reyes, R" uniqKey="Reyes R" first="R." last="Reyes">R. Reyes</name></noRegion><name sortKey="Bahcall, N" sort="Bahcall, N" uniqKey="Bahcall N" first="N." last="Bahcall">N. Bahcall</name><name sortKey="Hirata, C" sort="Hirata, C" uniqKey="Hirata C" first="C." last="Hirata">C. Hirata</name><name sortKey="Mandelbaum, R" sort="Mandelbaum, R" uniqKey="Mandelbaum R" first="R." last="Mandelbaum">R. Mandelbaum</name><name sortKey="Seljak, U" sort="Seljak, U" uniqKey="Seljak U" first="U." last="Seljak">U. Seljak</name></country><country name="Suisse"><region name="Canton de Zurich"><name sortKey="Seljak, U" sort="Seljak, U" uniqKey="Seljak U" first="U." last="Seljak">U. Seljak</name></region></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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