On Combining Lensing Shear Information from Multiple Filters

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dc.creatorJarvis, Mike
dc.creatorJain, Bhuvnesh
dc.date2007-06-29
dc.date2007-11-28
dc.date.accessioned2026-07-07T11:17:19Z
dc.date.available2026-07-07T11:17:19Z
dc.descriptionWe consider the possible gain in the measurement of lensing shear from imaging data in multiple filters. Galaxy shapes may differ significantly across filters, so that the same galaxy offers multiple samples of the shear. On the other extreme, if galaxy shapes are identical in different filters, one can combine them to improve the signal-to-noise and thus increase the effective number density of faint, high redshift galaxies. We use the GOODS dataset to test these scenarios by calculating the covariance matrix of galaxy ellipticities in four visual filters (B,V,i,z). We find that galaxy shapes are highly correlated, and estimate the gain in galaxy number density by combining their shapes.
dc.description8 pages, no figures, submitted to JCAP
dc.identifierhttps://arxiv.org/abs/0706.4316
dc.identifierhttp://arxiv.org/abs/0706.4316
dc.identifierJCAP0801:003,2008
dc.identifierdoi:10.1088/1475-7516/2008/01/003
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/192971
dc.subjectAstrophysics
dc.titleOn Combining Lensing Shear Information from Multiple Filters
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