The dwarf stellar mass function in different environments and the lack of a generic missing dwarfs problem in ΛCDM Article Swipe
Ilin Lazar
,
Sugata Kaviraj
,
Garreth Martin
,
A. E. Watkins
,
Darshan Kakkad
,
B Bichang’a
,
Katarina Kraljic
,
Sukyoung K. Yi
,
Yohan Dubois
,
Julien Devriendt
,
Sébastien Peirani
,
Christophe Pichon
·
YOU?
·
· 2025
· Open Access
·
· DOI: https://doi.org/10.1093/mnras/staf1870
YOU?
·
· 2025
· Open Access
·
· DOI: https://doi.org/10.1093/mnras/staf1870
We combine deep photometric data in the COSMOS and XMM-LSS fields with high-resolution cosmological hydrodynamical simulations to explore two key questions: (1) how does the galaxy stellar mass function, particularly in the dwarf ($M_\star$ $<$ 10$^{9.5}$ M$_\odot$) regime, vary with environment, defined as the distance from large-scale structure (LSS) traced by nodes and filaments in the cosmic web? (2) is there a generic ‘missing dwarfs’ problem in Lambda cold dark matter ($\Lambda$CDM) predictions when all environments – and not just satellites around Milky Way like galaxies – are considered? The depth of the observational data used here enables us to construct complete, unbiased samples of galaxies, down to $M_{\star }$ $\sim$ 10$^7$ M$_{\odot }$ and out to $z\sim 0.4$. Strong environmental differences are found for the galaxy stellar mass function when considering distance from LSS. As we move closer to LSS, the dwarf mass function becomes progressively flatter and the knee of the mass function shifts to larger stellar masses, both of which result in a higher ratio of massive to dwarf galaxies. While the stellar mass functions from the three simulations (NewHorizon, TNG50, and FIREbox) considered here do not completely agree across the dwarf regime, there is no evidence of a generic missing dwarfs problem in the context of $\Lambda$CDM, akin to the results of recent work that demonstrates that there is no missing satellites problem around Galactic analogues.
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- article
- Language
- en
- Landing Page
- https://doi.org/10.1093/mnras/staf1870
- https://academic.oup.com/mnras/advance-article-pdf/doi/10.1093/mnras/staf1870/65042066/staf1870.pdf
- OA Status
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- OpenAlex ID
- https://openalex.org/W4415703976
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https://doi.org/10.1093/mnras/staf1870Digital Object Identifier
- Title
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The dwarf stellar mass function in different environments and the lack of a generic missing dwarfs problem in ΛCDMWork title
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articleOpenAlex work type
- Language
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enPrimary language
- Publication year
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2025Year of publication
- Publication date
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2025-10-29Full publication date if available
- Authors
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Ilin Lazar, Sugata Kaviraj, Garreth Martin, A. E. Watkins, Darshan Kakkad, B Bichang’a, Katarina Kraljic, Sukyoung K. Yi, Yohan Dubois, Julien Devriendt, Sébastien Peirani, Christophe PichonList of authors in order
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https://doi.org/10.1093/mnras/staf1870Publisher landing page
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https://academic.oup.com/mnras/advance-article-pdf/doi/10.1093/mnras/staf1870/65042066/staf1870.pdfDirect link to full text PDF
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YesWhether a free full text is available
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goldOpen access status per OpenAlex
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https://academic.oup.com/mnras/advance-article-pdf/doi/10.1093/mnras/staf1870/65042066/staf1870.pdfDirect OA link when available
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