Physical Correlations of the Scatter between Galaxy Mass, Stellar Content, and Halo Mass. Bradshaw, C., Leauthaud, A., Hearin, A., Huang, S., & Behroozi, P. arXiv e-prints, 1905:arXiv:1905.09353, May, 2019. ![Physical Correlations of the Scatter between Galaxy Mass, Stellar Content, and Halo Mass [link]](https://bibbase.org/img/filetypes/link.svg "link")
Paper abstract bibtex We use the UniverseMachine to analyze the source of scatter between the central galaxy mass, the total stellar mass in the halo, and the dark matter halo mass. We also propose a new halo mass estimator, the cen+N mass: the sum of the stellar mass of the central and the N most massive satellites. We show that, when real space positions are perfectly known, the cen+N mass has scatter competitive with that of richness-based estimators. However, in redshift space, the cen+N mass suffers less from projection effects in the UniverseMachine model. The cen+N mass is therefore a viable low scatter halo mass estimator, and should be considered an important tool to constrain cosmology with upcoming spectroscopic data from DESI. We analyze the scatter in stellar mass at fixed halo mass and show that the total stellar mass in a halo is uncorrelated with secondary halo properties, but that the central stellar mass is a function of both halo mass and halo age. This is because central galaxies in older halos have had more time to grow via accretion. If the UniverseMachine model is correct, accurate galaxy-halo modeling of mass selected samples therefore needs to consider halo age in addition to mass.
@article{bradshaw_physical_2019,
title = {Physical {Correlations} of the {Scatter} between {Galaxy} {Mass}, {Stellar} {Content}, and {Halo} {Mass}},
volume = {1905},
url = {http://adsabs.harvard.edu/abs/2019arXiv190509353B},
abstract = {We use the UniverseMachine to analyze the source of scatter between the
central galaxy mass, the total stellar mass in the halo, and the dark
matter halo mass. We also propose a new halo mass estimator, the cen+N
mass: the sum of the stellar mass of the central and the N most massive
satellites. We show that, when real space positions are perfectly known,
the cen+N mass has scatter competitive with that of richness-based
estimators. However, in redshift space, the cen+N mass suffers less from
projection effects in the UniverseMachine model. The cen+N mass is
therefore a viable low scatter halo mass estimator, and should be
considered an important tool to constrain cosmology with upcoming
spectroscopic data from DESI. We analyze the scatter in stellar mass at
fixed halo mass and show that the total stellar mass in a halo is
uncorrelated with secondary halo properties, but that the central
stellar mass is a function of both halo mass and halo age. This is
because central galaxies in older halos have had more time to grow via
accretion. If the UniverseMachine model is correct, accurate galaxy-halo
modeling of mass selected samples therefore needs to consider halo age
in addition to mass.},
urldate = {2019-05-29},
journal = {arXiv e-prints},
author = {Bradshaw, Christopher and Leauthaud, Alexie and Hearin, Andrew and Huang, Song and Behroozi, Peter},
month = may,
year = {2019},
keywords = {Astrophysics - Astrophysics of Galaxies, Astrophysics - Cosmology and Nongalactic Astrophysics},
pages = {arXiv:1905.09353},
}
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We also propose a new halo mass estimator, the cen+N\nmass: the sum of the stellar mass of the central and the N most massive\nsatellites. We show that, when real space positions are perfectly known,\nthe cen+N mass has scatter competitive with that of richness-based\nestimators. However, in redshift space, the cen+N mass suffers less from\nprojection effects in the UniverseMachine model. The cen+N mass is\ntherefore a viable low scatter halo mass estimator, and should be\nconsidered an important tool to constrain cosmology with upcoming\nspectroscopic data from DESI. We analyze the scatter in stellar mass at\nfixed halo mass and show that the total stellar mass in a halo is\nuncorrelated with secondary halo properties, but that the central\nstellar mass is a function of both halo mass and halo age. This is\nbecause central galaxies in older halos have had more time to grow via\naccretion. 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