Tracing the cosmic web
The cosmic web is one of the most striking features of the distribution of galaxies and dark matter on the largest scales in the Universe. It is composed of dense regions packed full of galaxies, long filamentary bridges, flattened sheets and vast low-density voids. The study of the cosmic web has f...
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2018
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paper:paper_00358711_v473_n1_p1195_Libeskind2023-06-08T15:01:48Z Tracing the cosmic web Cosmology: theory Dark matter Large-scale structure of the Universe Methods: data analysis The cosmic web is one of the most striking features of the distribution of galaxies and dark matter on the largest scales in the Universe. It is composed of dense regions packed full of galaxies, long filamentary bridges, flattened sheets and vast low-density voids. The study of the cosmic web has focused primarily on the identification of such features, and on understanding the environmental effects on galaxy formation and halo assembly. As such, a variety of different methods have been devised to classify the cosmic web - depending on the data at hand, be it numerical simulations, large sky surveys or other. In this paper, we bring 12 of these methods together and apply them to the same data set in order to understand how they compare. In general, these cosmic-web classifiers have been designed with different cosmological goals in mind, and to study different questions. Therefore, one would not a priori expect agreement between different techniques; however, many of these methods do converge on the identification of specific features. In this paper, we study the agreements and disparities of the different methods. For example, each method finds that knots inhabit higher density regions than filaments, etc. and that voids have the lowest densities. For a given web environment, we find a substantial overlap in the density range assigned by each web classification scheme. We also compare classifications on a halo-by-halo basis; for example, we find that 9 of 12 methods classify around a third of group-mass haloes (i.e. M halo ~ 10 13.5 h -1 M ⊙ ) as being in filaments. Lastly, so that any future cosmic-web classification scheme can be compared to the 12 methods used here, we have made all the data used in this paper public. © 2017 The Authors. 2018 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00358711_v473_n1_p1195_Libeskind http://hdl.handle.net/20.500.12110/paper_00358711_v473_n1_p1195_Libeskind |
| institution |
Universidad de Buenos Aires |
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I-28 |
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R-134 |
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Cosmology: theory Dark matter Large-scale structure of the Universe Methods: data analysis |
| spellingShingle |
Cosmology: theory Dark matter Large-scale structure of the Universe Methods: data analysis Tracing the cosmic web |
| topic_facet |
Cosmology: theory Dark matter Large-scale structure of the Universe Methods: data analysis |
| description |
The cosmic web is one of the most striking features of the distribution of galaxies and dark matter on the largest scales in the Universe. It is composed of dense regions packed full of galaxies, long filamentary bridges, flattened sheets and vast low-density voids. The study of the cosmic web has focused primarily on the identification of such features, and on understanding the environmental effects on galaxy formation and halo assembly. As such, a variety of different methods have been devised to classify the cosmic web - depending on the data at hand, be it numerical simulations, large sky surveys or other. In this paper, we bring 12 of these methods together and apply them to the same data set in order to understand how they compare. In general, these cosmic-web classifiers have been designed with different cosmological goals in mind, and to study different questions. Therefore, one would not a priori expect agreement between different techniques; however, many of these methods do converge on the identification of specific features. In this paper, we study the agreements and disparities of the different methods. For example, each method finds that knots inhabit higher density regions than filaments, etc. and that voids have the lowest densities. For a given web environment, we find a substantial overlap in the density range assigned by each web classification scheme. We also compare classifications on a halo-by-halo basis; for example, we find that 9 of 12 methods classify around a third of group-mass haloes (i.e. M halo ~ 10 13.5 h -1 M ⊙ ) as being in filaments. Lastly, so that any future cosmic-web classification scheme can be compared to the 12 methods used here, we have made all the data used in this paper public. © 2017 The Authors. |
| title |
Tracing the cosmic web |
| title_short |
Tracing the cosmic web |
| title_full |
Tracing the cosmic web |
| title_fullStr |
Tracing the cosmic web |
| title_full_unstemmed |
Tracing the cosmic web |
| title_sort |
tracing the cosmic web |
| publishDate |
2018 |
| url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00358711_v473_n1_p1195_Libeskind http://hdl.handle.net/20.500.12110/paper_00358711_v473_n1_p1195_Libeskind |
| _version_ |
1768544400691953664 |