nIFTy cosmology: The clustering consistency of galaxy formation models

Authors
Pujol, Arnau; Skibba, Ramin A.; Gaztañaga, Enrique; Benson, Andrew; Blaizot, Jeremy; Bower, Richard; Carretero, Jorge; Castander, Francisco J.; Cattaneo, Andrea; Cora, Sofia Alejandra; Croton, Darren J.; Cui, Weiguang; Cunnama, Daniel; De Lucia, Gabriella; Devriendt, Julien E.; Elahi, Pascal J.; Font, Andreea; Fontanot, Fabio; Garcia Bellido, Juan; Gargiulo, Ignacio Daniel; Gonzalez Perez, Violeta; Helly, John; Henriques, Bruno M. B.; Hirschmann, Michaela; Knebe, Alexander; Lee, Jaehyun; Mamon, Gary A.; Monaco, Pierluigi; Onions, Julian; Padilla, Nelson David; Pearce, Frazer R.; Power, Chris; Somerville, Rachel S.; Srisawat, Chaichalit; Thomas, Peter A.; Tollet, Edouard; Vega Martínez, Cristian Antonio; Yi, Sukyoung K.
Publication Year
2017
Language
English
Format
article
Status
Published version
Description
We present a clustering comparison of 12 galaxy formation models [including semi-analytic models (SAMs) and halo occupation distribution (HOD) models] all run on halo catalogues and merger trees extracted from a single Λ cold dark matter N-body simulation. We compare the results of the measurements of the mean halo occupation numbers, the radial distribution of galaxies in haloes and the two-point correlation functions (2PCF). We also study the implications of the different treatments of orphan (galaxies not assigned to any dark matter subhalo) and non-orphan galaxies in these measurements. Our main result is that the galaxy formation models generally agree in their clustering predictions but they disagree significantly between HOD and SAMs for the orphan satellites. Although there is a very good agreement between the models on the 2PCF of central galaxies, the scatter between the models when orphan satellites are included can be larger than a factor of 2 for scales smaller than 1 h-1 Mpc. We also show that galaxy formation models that do not include orphan satellite galaxies have a significantly lower 2PCF on small scales, consistent with previous studies. Finally, we show that the 2PCF of orphan satellites is remarkably different between SAMs and HOD models. Orphan satellites in SAMs present a higher clustering than in HOD models because they tend to occupy more massive haloes. We conclude that orphan satellites have an important role on galaxy clustering and they are the main cause of the differences in the clustering between HOD models and SAMs.
Fil: Pujol, Arnau. Institut de Ciències De'l Espai; España
Fil: Skibba, Ramin A.. Center For Astrophysics And Space Sciences; Estados Unidos
Fil: Gaztañaga, Enrique. Institut de Ciències De'l Espai; España
Fil: Benson, Andrew. Carnegie Observatories; Estados Unidos
Fil: Blaizot, Jeremy. Université de Lyon; Francia
Fil: Bower, Richard. Institute For Computational Cosmology; Reino Unido
Fil: Carretero, Jorge. The Barcelona Institute Of Science And Technology; España
Fil: Castander, Francisco J.. Institut de Ciències De'l Espai; España
Fil: Cattaneo, Andrea. Centre National de la Recherche Scientifique; Francia
Fil: Cora, Sofia Alejandra. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Astrofísica La Plata. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas. Instituto de Astrofísica La Plata; Argentina
Fil: Croton, Darren J.. Swinburne University Of Technology; Australia
Fil: Cui, Weiguang. Universidad Autónoma de Madrid; España
Fil: Cunnama, Daniel. South African Astronomical Observatory; Sudáfrica
Fil: De Lucia, Gabriella. Osservatorio Astronomico Di Trieste; Italia
Fil: Devriendt, Julien E.. University of Oxford; Reino Unido
Fil: Elahi, Pascal J.. Sydney Institute For Astronomy; Australia
Fil: Font, Andreea. Liverpool John Moores University; Reino Unido
Fil: Fontanot, Fabio. Astronomical Observatory Of Trieste; Italia
Fil: Garcia Bellido, Juan. Universidad Autónoma de Madrid; España
Fil: Gargiulo, Ignacio Daniel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Astrofísica La Plata. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas. Instituto de Astrofísica La Plata; Argentina
Fil: Gonzalez Perez, Violeta. Institute For Computational Cosmology; Reino Unido
Fil: Helly, John. Institute For Computational Cosmology; Reino Unido
Fil: Henriques, Bruno M. B.. Max Planck Institut Fur Astrophysics; Alemania
Fil: Hirschmann, Michaela. Institut de Astrophysique de Paris; Francia
Fil: Knebe, Alexander. Instituto de Fisica Teorica; España
Fil: Lee, Jaehyun. Yonsei University; Corea del Sur
Fil: Mamon, Gary A.. Institut de Astrophysique de Paris; Francia
Fil: Monaco, Pierluigi. Astronomical Observatory Of Trieste; Italia
Fil: Onions, Julian. The University Of Nottingham. School Of Physics & Astronomy; Reino Unido
Fil: Padilla, Nelson David. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Astrofísica La Plata. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas. Instituto de Astrofísica La Plata; Argentina
Fil: Pearce, Frazer R.. Science and Technology Facilities Council of Nottingham. Rutherford Appleton Laboratory; Reino Unido. University of Nottingham; Estados Unidos
Fil: Power, Chris. International Centre For Radio Astronomy Reasearch; Australia
Fil: Somerville, Rachel S.. International Centre For Radio Astronomy Research; Australia
Fil: Srisawat, Chaichalit. University of Sussex; Reino Unido
Fil: Thomas, Peter A.. University of Sussex; Reino Unido
Fil: Tollet, Edouard. Observatoire de París; Francia
Fil: Vega Martínez, Cristian Antonio. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Astrofísica La Plata. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas. Instituto de Astrofísica La Plata; Argentina
Fil: Yi, Sukyoung K.. Yonsei University; Corea del Sur
Subject
COSMOLOGY: THEORY
GALAXIES: HALOES
METHODS: NUMERICAL
Astronomía
Ciencias Físicas
CIENCIAS NATURALES Y EXACTAS
Access level
Open access
License
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
Repository
CONICET Digital (CONICET)
Institution
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identifier
oai:ri.conicet.gov.ar:11336/82490