TY - JOUR
T1 - An improved halo occupation distribution prescription from UNITsim Hα emission-line galaxies
T2 - conformity and modified radial profile
AU - Reyes-Peraza, Guillermo
AU - Avila, Santiago
AU - Gonzalez-Perez, Violeta
AU - Lopez-Cano, Daniel
AU - Knebe, Alexander
AU - Ramakrishnan, Sujatha
AU - Yepes, Gustavo
N1 - Publisher Copyright:
© 2024 The Author(s).
PY - 2024/4/1
Y1 - 2024/4/1
N2 - Emission-line galaxies (ELGs) are targeted by the new generation of spectroscopic surveys to make unprecedented measurements in cosmology from their distribution. Accurately interpreting these data require understanding the imprints imposed by the physics of galaxy formation and evolution on galaxy clustering. In this work, we utilize a semi-analytical model of galaxy formation (SAGE) to explore the necessary components for accurately reproducing the clustering of ELGs. We focus on developing a halo occupation distribution (HOD) prescription able to reproduce the clustering of SAGE galaxies. Typically, HOD models assume that satellite and central galaxies of a given type are independent events. We investigate the need for conformity, i.e. whether the average satellite occupation depends on the existence of a central galaxy of a given type. Incorporating conformity into HOD models is crucial for reproducing the clustering in the reference galaxy sample. Another aspect we investigate is the radial distribution of satellite galaxies within haloes. The traditional density profile models, Navarro–Frenk–White (NFW) and Einasto profiles, fail to accurately replicate the small-scale clustering measured for SAGE satellite galaxies. To overcome this limitation, we propose a generalization of the NFW profile, thereby enhancing our understanding of galaxy clustering.
AB - Emission-line galaxies (ELGs) are targeted by the new generation of spectroscopic surveys to make unprecedented measurements in cosmology from their distribution. Accurately interpreting these data require understanding the imprints imposed by the physics of galaxy formation and evolution on galaxy clustering. In this work, we utilize a semi-analytical model of galaxy formation (SAGE) to explore the necessary components for accurately reproducing the clustering of ELGs. We focus on developing a halo occupation distribution (HOD) prescription able to reproduce the clustering of SAGE galaxies. Typically, HOD models assume that satellite and central galaxies of a given type are independent events. We investigate the need for conformity, i.e. whether the average satellite occupation depends on the existence of a central galaxy of a given type. Incorporating conformity into HOD models is crucial for reproducing the clustering in the reference galaxy sample. Another aspect we investigate is the radial distribution of satellite galaxies within haloes. The traditional density profile models, Navarro–Frenk–White (NFW) and Einasto profiles, fail to accurately replicate the small-scale clustering measured for SAGE satellite galaxies. To overcome this limitation, we propose a generalization of the NFW profile, thereby enhancing our understanding of galaxy clustering.
KW - galaxies: formation
KW - galaxies: haloes
KW - large-scale structure of Universe
KW - methods: numerical
KW - software: simulations
KW - surveys
UR - http://www.scopus.com/inward/record.url?scp=85189334812&partnerID=8YFLogxK
U2 - 10.1093/mnras/stae623
DO - 10.1093/mnras/stae623
M3 - Article
AN - SCOPUS:85189334812
SN - 0035-8711
VL - 529
SP - 3877
EP - 3893
JO - Monthly Notices of the Royal Astronomical Society
JF - Monthly Notices of the Royal Astronomical Society
IS - 4
ER -