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The American Astronomical Society (AAS), established in 1899 and based in Washington, DC, is the major organization of professional astronomers in North America. Its membership of about 7,000 individuals also includes physicists, mathematicians, geologists, engineers, and others whose research and educational interests lie within the broad spectrum of subjects comprising contemporary astronomy. The mission of the AAS is to enhance and share humanity's scientific understanding of the universe.

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Morphology of the Galaxy Distribution from Wavelet Denoising

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© 2005. The American Astronomical Society. All rights reserved. Printed in U.S.A.
,,Citation Vicent J. Martínezet al 2005ApJ634 744DOI 10.1086/497125

Vicent J. Martínez

AFFILIATIONS

Observatori Astronòmic, Universitat de València, Apartat de Correus 22085, E-46071 València, Spain

Jean-Luc Starck

AFFILIATIONS

Commissariat a l'Energie Atomique-Saclay, DAPNIA/SEDI-SAP, Service d’Astrophysique, F-91191 Gif-sur-Yvette, France

Enn Saar

AFFILIATIONS

Tartu Observatoorium, Tõravere, 61602, Estonia

David L. Donoho

AFFILIATIONS

Department of Statistics, Stanford University, Sequoia Hall, Stanford, CA 94305

Simon C. Reynolds

AFFILIATIONS

Blackett Laboratory, Imperial College London, SW7 2AZ, UK

Pablo de la Cruz

AFFILIATIONS

Observatorio Astronómico, Universidad de Valencia, Apartado de Correos 22085, E-46071 Valencia, Spain

Silvestre Paredes

AFFILIATIONS

Departamento de Matemática Aplicada y Estadística, Universidad Politécnica de Cartagena, 30203 Cartagena, Spain

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Dates

  1. Received2005 May 23
  2. Accepted2005 July 29
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0004-637X/634/2/744

Abstract

We have developed a method based on wavelets to obtain the true underlying smooth density from a point distribution. The goal has been to reconstruct the density field in an optimal way, ensuring that the morphology of the reconstructed field reflects the true underlying morphology of the point field, which, as the galaxy distribution, has a genuinely multiscale structure, with near-singular behavior on sheets, filaments, and hot spots. If the discrete distributions are smoothed using Gaussian filters, the morphological properties tend to be closer to those expected for a Gaussian field. The use of wavelet denoising provides us with a unique and more accurate morphological description.

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10.1086/497125

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