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arXiv:0706.4316 (astro-ph)
[Submitted on 29 Jun 2007 (v1), last revised 28 Nov 2007 (this version, v2)]

Title:On Combining Lensing Shear Information from Multiple Filters

Authors:Mike Jarvis, Bhuvnesh Jain (U Penn)
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Abstract: We 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.
Comments: 8 pages, no figures, submitted to JCAP
Subjects: Astrophysics (astro-ph)
Cite as: arXiv:0706.4316 [astro-ph]
  (or arXiv:0706.4316v2 [astro-ph] for this version)
  https://doi.org/10.48550/arXiv.0706.4316
Journal reference: JCAP0801:003,2008
Related DOI: https://doi.org/10.1088/1475-7516/2008/01/003

Submission history

From: Bhuvnesh Jain [view email]
[v1] Fri, 29 Jun 2007 14:53:28 UTC (8 KB)
[v2] Wed, 28 Nov 2007 20:06:04 UTC (9 KB)
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