nIFTy cosmology: the clustering consistency of galaxy formation models

Arnau Pujol, Ramin A. Skibba, Enrique Gaztanaga, Andrew Benson, Jeremy Blaizot, Richard Bower, Jorge Carretero, Francisco J. Castander, Andrea Cattaneo, Sofia A. Cora, Darren J. Croton, Weiguang Cui, Daniel Cunnama, Gabriella De Lucia, Julien E. Devriendt, Pascal J. Elahi, Andreea Font, Fabio Fontanot, Juan Garcia-Bellido, Ignacio D. Gargiulo & 18 others Violeta Gonzalez-Perez, John Helly, Bruno M. B. Henriques, Michaela Hirschmann, Alexander Knebe, Jaehyun Lee, Gary A. Mamon, Pierluigi Monaco, Julian Onions, Nelson D. Padilla, Frazer R. Pearce, Chris Power, Rachel S. Somerville, Chaichalit Srisawat, Peter A. Thomas, Edouard Tollet, Cristian A. Vega-Martinez, Sukyoung K. Yi

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Abstract

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 Lambda 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.

Original languageEnglish
Pages (from-to)749-762
Number of pages14
JournalMonthly Notices of the Royal Astronomical Society
Volume469
Issue number1
DOIs
Publication statusPublished - Jul 2017

Cite this

Pujol, A., Skibba, R. A., Gaztanaga, E., Benson, A., Blaizot, J., Bower, R., ... Yi, S. K. (2017). nIFTy cosmology: the clustering consistency of galaxy formation models. Monthly Notices of the Royal Astronomical Society, 469(1), 749-762. https://doi.org/10.1093/mnras/stx913
Pujol, Arnau ; Skibba, Ramin A. ; Gaztanaga, Enrique ; Benson, Andrew ; Blaizot, Jeremy ; Bower, Richard ; Carretero, Jorge ; Castander, Francisco J. ; Cattaneo, Andrea ; Cora, Sofia A. ; 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 D. ; Gonzalez-Perez, Violeta ; Helly, John ; Henriques, Bruno M. B. ; Hirschmann, Michaela ; Knebe, Alexander ; Lee, Jaehyun ; Mamon, Gary A. ; Monaco, Pierluigi ; Onions, Julian ; Padilla, Nelson D. ; Pearce, Frazer R. ; Power, Chris ; Somerville, Rachel S. ; Srisawat, Chaichalit ; Thomas, Peter A. ; Tollet, Edouard ; Vega-Martinez, Cristian A. ; Yi, Sukyoung K. / nIFTy cosmology : the clustering consistency of galaxy formation models. In: Monthly Notices of the Royal Astronomical Society. 2017 ; Vol. 469, No. 1. pp. 749-762.
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abstract = "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 Lambda 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.",
keywords = "methods: numerical, galaxies: haloes, cosmology: theory, DARK-MATTER HALOES, CHALLENGE LIGHTCONE SIMULATION, ACTIVE GALACTIC NUCLEI, LUMINOSITY FUNCTION, SEMIANALYTIC MODEL, ANALYTIC MODEL, MASS FUNCTION, OCCUPATION DISTRIBUTION, BULGE FORMATION, LOCAL UNIVERSE",
author = "Arnau Pujol and Skibba, {Ramin A.} and Enrique Gaztanaga and Andrew Benson and Jeremy Blaizot and Richard Bower and Jorge Carretero and Castander, {Francisco J.} and Andrea Cattaneo and Cora, {Sofia A.} and Croton, {Darren J.} and Weiguang Cui and Daniel Cunnama and {De Lucia}, Gabriella and Devriendt, {Julien E.} and Elahi, {Pascal J.} and Andreea Font and Fabio Fontanot and Juan Garcia-Bellido and Gargiulo, {Ignacio D.} and Violeta Gonzalez-Perez and John Helly and Henriques, {Bruno M. B.} and Michaela Hirschmann and Alexander Knebe and Jaehyun Lee and Mamon, {Gary A.} and Pierluigi Monaco and Julian Onions and Padilla, {Nelson D.} and Pearce, {Frazer R.} and Chris Power and Somerville, {Rachel S.} and Chaichalit Srisawat and Thomas, {Peter A.} and Edouard Tollet and Vega-Martinez, {Cristian A.} and Yi, {Sukyoung K.}",
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language = "English",
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Pujol, A, Skibba, RA, Gaztanaga, E, Benson, A, Blaizot, J, Bower, R, Carretero, J, Castander, FJ, Cattaneo, A, Cora, SA, Croton, DJ, Cui, W, Cunnama, D, De Lucia, G, Devriendt, JE, Elahi, PJ, Font, A, Fontanot, F, Garcia-Bellido, J, Gargiulo, ID, Gonzalez-Perez, V, Helly, J, Henriques, BMB, Hirschmann, M, Knebe, A, Lee, J, Mamon, GA, Monaco, P, Onions, J, Padilla, ND, Pearce, FR, Power, C, Somerville, RS, Srisawat, C, Thomas, PA, Tollet, E, Vega-Martinez, CA & Yi, SK 2017, 'nIFTy cosmology: the clustering consistency of galaxy formation models' Monthly Notices of the Royal Astronomical Society, vol. 469, no. 1, pp. 749-762. https://doi.org/10.1093/mnras/stx913

nIFTy cosmology : the clustering consistency of galaxy formation models. / Pujol, Arnau; Skibba, Ramin A.; Gaztanaga, Enrique; Benson, Andrew; Blaizot, Jeremy; Bower, Richard; Carretero, Jorge; Castander, Francisco J.; Cattaneo, Andrea; Cora, Sofia A.; 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 D.; Gonzalez-Perez, Violeta; Helly, John; Henriques, Bruno M. B.; Hirschmann, Michaela; Knebe, Alexander; Lee, Jaehyun; Mamon, Gary A.; Monaco, Pierluigi; Onions, Julian; Padilla, Nelson D.; Pearce, Frazer R.; Power, Chris; Somerville, Rachel S.; Srisawat, Chaichalit; Thomas, Peter A.; Tollet, Edouard; Vega-Martinez, Cristian A.; Yi, Sukyoung K.

In: Monthly Notices of the Royal Astronomical Society, Vol. 469, No. 1, 07.2017, p. 749-762.

Research output: Contribution to journalArticle

TY - JOUR

T1 - nIFTy cosmology

T2 - the clustering consistency of galaxy formation models

AU - Pujol, Arnau

AU - Skibba, Ramin A.

AU - Gaztanaga, Enrique

AU - Benson, Andrew

AU - Blaizot, Jeremy

AU - Bower, Richard

AU - Carretero, Jorge

AU - Castander, Francisco J.

AU - Cattaneo, Andrea

AU - Cora, Sofia A.

AU - Croton, Darren J.

AU - Cui, Weiguang

AU - Cunnama, Daniel

AU - De Lucia, Gabriella

AU - Devriendt, Julien E.

AU - Elahi, Pascal J.

AU - Font, Andreea

AU - Fontanot, Fabio

AU - Garcia-Bellido, Juan

AU - Gargiulo, Ignacio D.

AU - Gonzalez-Perez, Violeta

AU - Helly, John

AU - Henriques, Bruno M. B.

AU - Hirschmann, Michaela

AU - Knebe, Alexander

AU - Lee, Jaehyun

AU - Mamon, Gary A.

AU - Monaco, Pierluigi

AU - Onions, Julian

AU - Padilla, Nelson D.

AU - Pearce, Frazer R.

AU - Power, Chris

AU - Somerville, Rachel S.

AU - Srisawat, Chaichalit

AU - Thomas, Peter A.

AU - Tollet, Edouard

AU - Vega-Martinez, Cristian A.

AU - Yi, Sukyoung K.

PY - 2017/7

Y1 - 2017/7

N2 - 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 Lambda 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.

AB - 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 Lambda 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.

KW - methods: numerical

KW - galaxies: haloes

KW - cosmology: theory

KW - DARK-MATTER HALOES

KW - CHALLENGE LIGHTCONE SIMULATION

KW - ACTIVE GALACTIC NUCLEI

KW - LUMINOSITY FUNCTION

KW - SEMIANALYTIC MODEL

KW - ANALYTIC MODEL

KW - MASS FUNCTION

KW - OCCUPATION DISTRIBUTION

KW - BULGE FORMATION

KW - LOCAL UNIVERSE

U2 - 10.1093/mnras/stx913

DO - 10.1093/mnras/stx913

M3 - Article

VL - 469

SP - 749

EP - 762

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

SN - 0035-8711

IS - 1

ER -