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Structure in the 3D Galaxy Distribution. II. Voids and Watersheds of Local Maxima and Minima
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Observational Astronomy.
2015 (English)In: Astrophysical Journal, ISSN 0004-637X, E-ISSN 1538-4357, Vol. 799, no 1, 95- p.Article in journal (Refereed) Published
Abstract [en]

The major uncertainties in studies of the multi-scale structure of the universe arise not from observational errors but from the variety of legitimate definitions and detection methods for individual structures. To facilitate the study of these methodological dependencies, we have carried out 12 different analyses defining structures in various ways. This has been done in a purely geometrical way by utilizing the HOP algorithm as a unique parameter-free method of assigning groups of galaxies to local density maxima or minima. From three density estimation techniques (smoothing kernels, Bayesian blocks, and self-organizing maps) applied to three data sets (the Sloan Digital Sky Survey Data Release 7, the Millennium simulation, and randomly distributed points) we tabulate information that can be used to construct catalogs of structures connected to local density maxima and minima. We also introduce a void finder that utilizes a method to assemble Delaunay tetrahedra into connected structures and characterizes regions empty of galaxies in the source catalog.

Place, publisher, year, edition, pages
2015. Vol. 799, no 1, 95- p.
Keyword [en]
catalogs, cosmology: observations, galaxies: clusters: general, large-scale structure of universe
National Category
Astronomy, Astrophysics and Cosmology
URN: urn:nbn:se:uu:diva-246365DOI: 10.1088/0004-637X/799/1/95ISI: 000348214500093OAI: oai:DiVA.org:uu-246365DiVA: diva2:793903
Available from: 2015-03-09 Created: 2015-03-05 Last updated: 2015-03-09Bibliographically approved

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Way, Michael J.
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