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CECILIA: The Mass–Metallicity Relation of Low-mass Galaxies at Cosmic Noon

  • Authors: Menelaos Raptis, Gwen C. Rudie, Ryan F. Trainor, Noah S. J. Rogers, Allison L. Strom, Nathalie A. Korhonen Cuestas, Caroline von Raesfeld, Ye Lin, Ojima Ojodomo Abraham, Christopher Chapman, Charles C. Steidel, Michael V. Maseda

Menelaos Raptis et al 2026 The Astrophysical Journal Letters 1004 .

  • Provider: AAS Journals

Caption: Figure 6.

A comparison of various low-mass MZR measurements at Cosmic Noon. The MZR for our CECILIA Faint sample (pink squares and shaded rectangles) is shown with the best-fit relation and scatter (purple line and shaded region). We include other direct-Te metallicity samples: two CECILIA Faint sources from N. S. J. Rogers et al. (2025; orange squares), a stack of 52 Lyα emitters (LAEs) at z ∼ 2.56 from R. F. Trainor et al. (2016; green circle), and a stack of gravitationally lensed dwarfs at z ∼ 2.3 from T. Gburek et al. (2023; aqua diamond), which appear generally consistent with the CECILIA Faint sample. We also show the MZR fits at z ∼ 2 and z ∼ 3 from M. Li et al. (2023; blue dotted lines). As discussed in the text, we expect that significant differences in the selection of galaxies between our sample and the M. Li et al. (2023) sample drive the differences in our inferred MZRs.

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