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.
Documento: | Artículo |
Título: | Tracing the cosmic web |
Autor: | Libeskind, N.I.; van de Weygaert, R.; Cautun, M.; Falck, B.; Tempel, E.; Abel, T.; Alpaslan, M.; Aragón-Calvo, M.A.; Forero-Romero, J.E.; Gonzalez, R.; Gottlöber, S.; Hahn, O.; Hellwing, W.A.; Hoffman, Y.; Jones, B.J.T.; Kitaura, F.; Knebe, A.; Manti, S.; Neyrinck, M.; Nuza, S.E.; Padilla, N.; Platen, E.; Ramachandra, N.; Robotham, A.; Saar, E.; Shandarin, S.; Steinmetz, M.; Stoica, R.S.; Sousbie, T.; Yepes, G. |
Filiación: | Leibniz-Institute für Astrophysik Potsdam (AIP), An der Sternwarte 16, Potsdam, D-14482, Germany Kapteyn Astronomical Institute, University of Groningen, PO Box 800, Groningen, NL-9700 AV, Netherlands Institute for Computational Cosmology, Durham University, South Road, Durham, DH1 3LE, United Kingdom Institute of Theoretical Astrophysics, University of Oslo, PO Box 1029, Blindern, Oslo, N-0315, Norway Tartu Observatory, Observatooriumi 1, Tõravere, 61602, Estonia Kavli Institute for Particle Astrophysics and Cosmology, Stanford University, Menlo Park, CA 94025, United States Department of Physics, Stanford University, Stanford, CA 94305, United States NASA Ames Research Center N232, Moffett Field, Mountain View, CA 94035, United States Instituto Astronomico de Ensenada, UNAM, Mexico Departamento de Física, Universidad de los Andes, Edificio Ip, Cra. 1 No. 18A-10, Bogotá, 111711, Colombia Instituto de Astrofísica, Pontificia Universidad Catolica de Chile, Santiago, 8970117, Chile Centro de Astro-Ingeniería, Pontificia Universidad Catolica de Chile, Santiago, 8970117, Chile Observatoire de la Cote d'Azur, Laboratoire Lagrange, Boulevard de l'Observatoire, CS 34229, Nice, F-06304, France Institute of Cosmology and Gravitation, University of Portsmouth, Portsmouth, PO1 3FX, United Kingdom JanuszGil Institute of Astronomy, University of ZielonaGóra, Ul. Szafrana 2, Zielona Góra, PL-65-516, Poland Racah Institute of Physics, Hebrew University of Jerusalem, Givat Ram, Jerusalem, 91904, Israel Instituto de Astrofísica de Canarias (IAC), C/Vía Láctea, s/n, La Laguna, Tenerife, E-38200, Spain Departamento Astrofísica, Universidad de La Laguna (ULL), La Laguna, Tenerife, E-38206, Spain Departamento de Física Teórica, Módulo 15, Facultad de Ciencias, Universidad Autónoma de Madrid, Madrid, E-28049, Spain Astro-UAM, UAM, Unidad Asociada CSIC, Spain Scuola Normale Superiore, Piazza dei Cavalieri 7, Pisa, I-56126, Italy Instituto de Astronomía y Física del Espacio (IAFE, CONICETUBA), CC 67, Suc. 28, Buenos Aires, 1428, Argentina Department of Physics and Astronomy, University of Kansas, Lawrence, KS 66045, United States ICRAR, M468, University of Western Australia, Crawley, WA 6009, Australia Institut Elie Cartan de Lorraine, Université de Lorraine, Vandoeuvre-lés-Nancy Cedex, F-54506, France Institut de Mécanique Céleste et Calcul des Ephemérides (IMCCE), Observatoire de Paris, Paris, F-75014, France Institut d'Astrophysique de Paris, CNRS UMR 7095 and UPMC, 98bis, bd Arago, Paris, F-75014, France |
Palabras clave: | Cosmology: theory; Dark matter; Large-scale structure of the Universe; Methods: data analysis |
Año: | 2018 |
Volumen: | 473 |
Número: | 1 |
Página de inicio: | 1195 |
Página de fin: | 1217 |
DOI: | http://dx.doi.org/10.1093/mnras/stx1976 |
Título revista: | Monthly Notices of the Royal Astronomical Society |
Título revista abreviado: | Mon. Not. R. Astron. Soc. |
ISSN: | 00358711 |
CODEN: | MNRAA |
Registro: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00358711_v473_n1_p1195_Libeskind |