Toward Accurate Modeling of Galaxy Clustering on Small Scales: Halo Model Extensions and Lingering Tension
This paper represents an effort to provide robust constraints on the galaxy–halo connection and simultaneously test the Planck ΛCDM cosmology using a fully numerical model of small-scale galaxy clustering. We explore two extensions to the standard Halo Occupation Distribution model: assembly bias, w...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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IOP Publishing
2023-01-01
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| Series: | The Astrophysical Journal |
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| Online Access: | https://doi.org/10.3847/1538-4357/acc576 |
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| author | Gillian D. Beltz-Mohrmann Adam O. Szewciw Andreas A. Berlind Manodeep Sinha |
| author_facet | Gillian D. Beltz-Mohrmann Adam O. Szewciw Andreas A. Berlind Manodeep Sinha |
| author_sort | Gillian D. Beltz-Mohrmann |
| collection | DOAJ |
| description | This paper represents an effort to provide robust constraints on the galaxy–halo connection and simultaneously test the Planck ΛCDM cosmology using a fully numerical model of small-scale galaxy clustering. We explore two extensions to the standard Halo Occupation Distribution model: assembly bias, whereby halo occupation depends on both halo mass and the larger environment, and velocity bias, whereby galaxy velocities do not perfectly trace the velocity of the dark matter within the halo. Moreover, we incorporate halo mass corrections to account for the impact of baryonic physics on the halo population. We identify an optimal set of clustering measurements to constrain this “decorated” HOD model for both low- and high-luminosity galaxies in SDSS DR7. We find that, for low-luminosity galaxies, a model with both assembly bias and velocity bias provides the best fit to the clustering measurements, with no tension remaining in the fit. In this model, we find evidence for both central and satellite galaxy assembly bias at the 99% and 95% confidence levels, respectively. In addition, we find evidence for satellite galaxy velocity bias at the 99.9% confidence level. For high-luminosity galaxies, we find no evidence for either assembly bias or velocity bias, but our model exhibits significant tension with SDSS measurements. We find that all of these conclusions still stand when we include the effects of baryonic physics on the halo mass function, suggesting that the tension we find for high-luminosity galaxies may be due to a problem with our assumed cosmological model. |
| first_indexed | 2024-03-12T04:11:33Z |
| format | Article |
| id | doaj.art-0f292dd22fb4476a920730e730e9813c |
| institution | Directory Open Access Journal |
| issn | 1538-4357 |
| language | English |
| last_indexed | 2024-03-12T04:11:33Z |
| publishDate | 2023-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | The Astrophysical Journal |
| spelling | doaj.art-0f292dd22fb4476a920730e730e9813c2023-09-03T10:55:37ZengIOP PublishingThe Astrophysical Journal1538-43572023-01-01948210010.3847/1538-4357/acc576Toward Accurate Modeling of Galaxy Clustering on Small Scales: Halo Model Extensions and Lingering TensionGillian D. Beltz-Mohrmann0https://orcid.org/0000-0002-4392-8920Adam O. Szewciw1https://orcid.org/0000-0001-9094-8433Andreas A. Berlind2https://orcid.org/0000-0002-1814-2002Manodeep Sinha3https://orcid.org/0000-0002-4845-1228Department of Physics and Astronomy, Vanderbilt University , 2201 West End Avenue, Nashville, TN 37235, USA ; gbeltzmohrmann@anl.gov; High Energy Physics Division, Argonne National Laboratory , 9700 South Cass Avenue, Lemont, IL 60439, USADepartment of Physics and Astronomy, Vanderbilt University , 2201 West End Avenue, Nashville, TN 37235, USA ; gbeltzmohrmann@anl.govDepartment of Physics and Astronomy, Vanderbilt University , 2201 West End Avenue, Nashville, TN 37235, USA ; gbeltzmohrmann@anl.gov; National Science Foundation , Division of Astronomical Sciences, Alexandria, VA 22314, USADepartment of Physics and Astronomy, Vanderbilt University , 2201 West End Avenue, Nashville, TN 37235, USA ; gbeltzmohrmann@anl.gov; SA 118, Center for Astrophysics & Supercomputing, Swinburne University of Technology , 1 Alfred St., Hawthorn, VIC 3122, Australia; ARC Centre of Excellence for All Sky Astrophysics in 3 Dimensions (ASTRO 3D) , AustraliaThis paper represents an effort to provide robust constraints on the galaxy–halo connection and simultaneously test the Planck ΛCDM cosmology using a fully numerical model of small-scale galaxy clustering. We explore two extensions to the standard Halo Occupation Distribution model: assembly bias, whereby halo occupation depends on both halo mass and the larger environment, and velocity bias, whereby galaxy velocities do not perfectly trace the velocity of the dark matter within the halo. Moreover, we incorporate halo mass corrections to account for the impact of baryonic physics on the halo population. We identify an optimal set of clustering measurements to constrain this “decorated” HOD model for both low- and high-luminosity galaxies in SDSS DR7. We find that, for low-luminosity galaxies, a model with both assembly bias and velocity bias provides the best fit to the clustering measurements, with no tension remaining in the fit. In this model, we find evidence for both central and satellite galaxy assembly bias at the 99% and 95% confidence levels, respectively. In addition, we find evidence for satellite galaxy velocity bias at the 99.9% confidence level. For high-luminosity galaxies, we find no evidence for either assembly bias or velocity bias, but our model exhibits significant tension with SDSS measurements. We find that all of these conclusions still stand when we include the effects of baryonic physics on the halo mass function, suggesting that the tension we find for high-luminosity galaxies may be due to a problem with our assumed cosmological model.https://doi.org/10.3847/1538-4357/acc576Large-scale structure of the universeGalaxy dark matter halosGalaxy groupsClusteringRedshift surveys |
| spellingShingle | Gillian D. Beltz-Mohrmann Adam O. Szewciw Andreas A. Berlind Manodeep Sinha Toward Accurate Modeling of Galaxy Clustering on Small Scales: Halo Model Extensions and Lingering Tension The Astrophysical Journal Large-scale structure of the universe Galaxy dark matter halos Galaxy groups Clustering Redshift surveys |
| title | Toward Accurate Modeling of Galaxy Clustering on Small Scales: Halo Model Extensions and Lingering Tension |
| title_full | Toward Accurate Modeling of Galaxy Clustering on Small Scales: Halo Model Extensions and Lingering Tension |
| title_fullStr | Toward Accurate Modeling of Galaxy Clustering on Small Scales: Halo Model Extensions and Lingering Tension |
| title_full_unstemmed | Toward Accurate Modeling of Galaxy Clustering on Small Scales: Halo Model Extensions and Lingering Tension |
| title_short | Toward Accurate Modeling of Galaxy Clustering on Small Scales: Halo Model Extensions and Lingering Tension |
| title_sort | toward accurate modeling of galaxy clustering on small scales halo model extensions and lingering tension |
| topic | Large-scale structure of the universe Galaxy dark matter halos Galaxy groups Clustering Redshift surveys |
| url | https://doi.org/10.3847/1538-4357/acc576 |
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