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Environmental density of galaxies from SDSS via Voronoi tessellation

Published online by Cambridge University Press:  12 October 2016

D. Dobrycheva ,
O. Melnyk ,
A. Elyiv  and
I. Vavilova
D. Dobrycheva
Affiliation:
Main Astronomical Observatory of the National Academy of Sciences of Ukraine, 27 Akademika Zabolotnoho St., 03680 Kyiv, Ukraine email: dariadobrycheva@gmail.com, andrii.elyiv@gmail.com, irivav@mao.kiev.ua
O. Melnyk
Affiliation:
Astronomical Observatory, Taras Shevchenko National University of Kyiv, 3 Observatorna St., 04053 Kyiv, Ukraine email: melnykol@gmail.com Dipartimento di Fisica e Astronomia, Universita di Bologna
A. Elyiv
Affiliation:
Main Astronomical Observatory of the National Academy of Sciences of Ukraine, 27 Akademika Zabolotnoho St., 03680 Kyiv, Ukraine email: dariadobrycheva@gmail.com, andrii.elyiv@gmail.com, irivav@mao.kiev.ua Dipartimento di Fisica e Astronomia, Universita di Bologna
I. Vavilova
Affiliation:
Main Astronomical Observatory of the National Academy of Sciences of Ukraine, 27 Akademika Zabolotnoho St., 03680 Kyiv, Ukraine email: dariadobrycheva@gmail.com, andrii.elyiv@gmail.com, irivav@mao.kiev.ua
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Abstract

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The aim of our work was to determine the environmental density of galaxies from SDSS DR9 using the Voronoi tessellation. We constructed the 3D Voronoi tessellation for the volume-limited galaxy sample within 0.02 <z<0.1 and -24 Mr-20.7 using an inverse volume of Voronoi cell as a parameter describing the local environmental density of a galaxy. It allowed us to inspect the morphology - density relation. We obtained that the early type galaxies prefer to reside in the Voronoi cells of smaller volumes (i.e. dense environments) than the late type galaxies, which are located in the larger Voronoi cells (i.e. sparse environments).

Keywords

methods: data analysis; surveys; galaxies: fundamental parametersgeneral
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 11 , Symposium S308: The Zeldovich Universe: Genesis and Growth of the Cosmic Web , June 2014 , pp. 248 - 249
Copyright
Copyright © International Astronomical Union 2016 

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