Galaxy Modeling with Compound Elliptical Shapelets

Details Galaxy Modeling with Compound Elliptical Shapelets Galaxy Modeling with Compound Elliptical Shapelets

2010-07-09

arxiv.org/abs/1007.1681v2

AJ 140 (2010) 870-879

Astronomy and Astrophysics

Astrophysics

Instrumentation and Methods for Astrophysics

14 pages, 7 figures

Scientific paper

10.1088/0004-6256/140/3/870

Gauss-Hermite and Gauss-Laguerre ("shapelet") decompositions of images have become important tools in galaxy modeling, particularly for the purpose of extracting ellipticity and morphological information from astronomical data. However, the standard shapelet basis functions cannot compactly represent galaxies with high ellipticity or large Sersic index, and the resulting underfitting bias has been shown to present a serious challenge for weak-lensing methods based on shapelets. We present here a new convolution relation and a compound "multi-scale" shapelet basis to address these problems, and provide a proof-of-concept demonstration using a small sample of nearby galaxies.

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