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Minkowski Functionals of SDSS Galaxies I : Analysis of Excursion Sets
Journal article   Open access

Minkowski Functionals of SDSS Galaxies I : Analysis of Excursion Sets

Chiaki Hikage, Jens Schmalzing, Thomas Buchert, Yasushi Suto, Issha Kayo, Atsushi Taruya, Michael S Vogeley, Fiona Hoyle, J. Richard Gott and Jon Brinkmann
Publications of the Astronomical Society of Japan, v 55(5), pp 911-931
25 Oct 2003
DOI: https://doi.org/10.1093/pasj/55.5.911
url
https://doi.org/10.1093/pasj/55.5.911View
Published, Version of Record (VoR)Maybe Open Access (Publisher Bronze),  Open

Abstract

large-scale structure of universe methods: statistical cosmology: observations
We present a first morphometric investigation of a preliminary sample from the SDSS of 154287 galaxies with apparent magnitude $14.5 < m_r < 17.5$ and redshift $0.001 < z < 0.4$ . We measure the Minkowski Functionals, which are a complete set of morphological descriptors. To account for the complicated wedge-like geometry of the present survey data, we construct isodensity contour surfaces from the galaxy positions in redshift space and employ two complementary methods of computing the Minkowski Functionals. We find that the observed Minkowski Functionals for SDSS galaxies are consistent with the prediction of a $\Lambda$ -dominated spatially-flat Cold Dark Matter model with random-Gaussian initial conditions, within the cosmic variance estimated from the corresponding mock catalogue. We expect that future releases of the SDSS survey will allow us to distinguish morphological differences in the galaxy distribution with regard to different morphological types and luminosity ranges.

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Astronomy & Astrophysics
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