The dwarf stellar mass function in different environments and the lack of a generic missing dwarfs problem in ΛCDM

Exploring foci of: Monthly Notices of the Royal Astronomical Society • Vol 544 • No 4 The dwarf stellar mass function in different environments and the lack of a generic missing dwarfs problem in ΛCDM October 2025 • Ilin Lazar, Sugata Kaviraj, Garreth Martin, A. E. Watkins, Darshan Kakkad, B Bichang’a, Katarina Kraljic, Sukyoung K. Yi, Yohan Dubois, Julien Devrie… ABSTRACT 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 ($M_\star$ $&amp;lt;$ 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) predictio… Open Article Page

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