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Caption: Figure 6.
The size–mass distribution of z > 4 massive galaxies presented here. We show the effective semimajor axes measured at rest-frame 0.5 μm (measured in F277W at z = 4 and F444W at z = 7). The points are colored by redshift and the shape indicates the 10 Myr averaged sSFR values from dense basis. The best-fit size–mass relations for quiescent and star-forming galaxies from van der Wel et al. (2014) extrapolated to z = 4–8 are also shown for comparison. The gray line shows the size range of a point source from z = 4 to 7. We find that our sample is primarily star forming and the slope of our sample in the size–mass plane is consistent with the results for star-forming galaxies at lower redshifts, however, they are smaller by a factor of ∼2 than predicted when the relation is extrapolated out to higher redshifts.
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© 2024. The Author(s). Published by the American Astronomical Society.
