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Evidence for a Shallow Evolution in the Volume Densities of Massive Galaxies at z = 4–8 from CEERS

  • Authors: Katherine Chworowsky, Steven L. Finkelstein, Michael Boylan-Kolchin, Elizabeth J. McGrath, Kartheik G. Iyer, Casey Papovich, Mark Dickinson, Anthony J. Taylor, L. Y. Aaron Yung, Pablo Arrabal Haro, Micaela B. Bagley, Bren E. Backhaus, Rachana Bhatawdekar, Yingjie Cheng, Nikko J. Cleri, Justin W. Cole, M. C. Cooper, Luca Costantin, Avishai Dekel, Maximilien Franco, Seiji Fujimoto, Christopher C. Hayward, Benne W. Holwerda, Marc Huertas-Company, Michaela Hirschmann, Taylor A. Hutchison, Anton M. Koekemoer, Rebecca L. Larson, Zhaozhou Li, Arianna S. Long, Ray A. Lucas, Nor Pirzkal, Giulia Rodighiero, Rachel S. Somerville, Brittany N. Vanderhoof, Alexander de la Vega, Stephen M. Wilkins, Guang Yang, Jorge A. Zavala

Katherine Chworowsky et al 2024 The Astronomical Journal 168 .

  • Provider: AAS Journals

Caption: Figure 1.

The distributions in redshift and stellar mass of the full CEERS catalog (Finkelstein et al. 2024), as measured by dense basis (with eazy priors on the dense basis–derived redshift). The darker shaded region denotes our redshift and mass ranges of interest, while the dark points indicate any source which has been visually inspected, the larger of which are sources whose median stellar mass and redshift satisfy our high-redshift mass criteria. We also show galaxies with MIRI coverage (red triangles) and those with spectroscopic confirmation (orange triangles). The galaxies marked with a red box are “extremely red objects” (EROs): F444W point sources with red F277W − F444W colors that are likely hosts to dust-reddened AGN (discussion in Section 3.5). We find 118 galaxies with median stellar mass and redshift values in our region of interest, including objects up to z ∼ 7.5. Notably, we find no sources at ﹩{\mathrm{log}}_{10}({M}_{\star }/{M}_{\odot })﹩ > 11 or at z > 8, and the highest-redshift sources we do find are all classified as EROs; thus reliable mass measurements are not possible.

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