Introducing Mexican needlets for CMB analysis: Issues for practical applications and comparison with standard needlets

Details Introducing Mexican needlets for CMB analysis: Issues for practical applications and comparison with standard needlets Introducing Mexican needlets for CMB analysis: Issues for practical applications and comparison with standard needlets

Publishing date

2010-04-30

URL

arxiv.org/abs/1004.5576v3

Journals

S. Scodeller et al. 2011 ApJ 733 121

Science

Astronomy and Astrophysics

Field

Astrophysics

SubField

Cosmology and Extragalactic Astrophysics

Additional info

40 pages, 11 figures, published version, main modification: added section on more realistic galactic and point source masks

Type

Scientific paper

Digital Object Identifier

10.1088/0004-637X/733/2/121

Abstract

Over the last few years, needlets have a emerged as a useful tool for the analysis of Cosmic Microwave Background (CMB) data. Our aim in this paper is first to introduce in the CMB literature a different form of needlets, known as Mexican needlets, first discussed in the mathematical literature by Geller and Mayeli (2009a,b). We then proceed with an extensive study of the properties of both standard and Mexican needlets; these properties depend on some parameters which can be tuned in order to optimize the performance for a given application. Our second aim in this paper is then to give practical advice on how to adjust these parameters in order to achieve the best properties for a given problem in CMB data analysis. In particular we investigate localization properties in real and harmonic spaces and propose a recipe on how to quantify the influence of galactic and point source masks on the needlet coefficients. We also show that for certain parameter values, the Mexican needlets provide a close approximation to the Spherical Mexican Hat Wavelets (whence their name), with some advantages concerning their numerical implementation and the derivation of their statistical properties.

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