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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 2.

Left: estimated stellar masses for galaxies with and without MIRI photometry. With one exception (the Larson et al. 2023 galaxy, which also has spectroscopic confirmation), including MIRI photometric constraints does not significantly alter the recovered stellar masses (average ΔM ≲ 0.1 dex), though it does reduce the median error by ∼0.05 dex. Right: comparison of photometric to measured spectroscopic redshifts for sources covered by NIRSpec (five sources) and WFSS (22 sources). Similar to previous analyses of JWST spectroscopy (e.g., Arrabal Haro et al. 2023; Fujimoto et al. 2023), we do observe a slight systematic offset between the photometric redshift estimates and the confirmed spectroscopic redshifts, with all but two galaxies having confirmed spectroscopic redshifts lower than the best-fit photometric estimates. However, we find general good agreement between z phot and z spec, with only four sources with Δz > 0.5, and no catastrophic outliers. We update our SED fitting with spectroscopic redshifts when available.

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