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[en] We investigate the sizes of z ∼ 6–8 dropout galaxies using the complete data of the Abell 2744 cluster and parallel fields in the Hubble Frontier Fields program. By directly fitting light profiles of observed galaxies with lensing-distorted Sérsic profiles on the image plane with the
glaficsoftware, we accurately measure intrinsic sizes of 31 z ∼ 6–7 and 8 galaxies, including those as faint as . We find that half-light radii re positively correlates with UV luminosity at each redshift, although the correlation is not very tight. The largest ( kpc) galaxies are mostly red in UV color while the smallest ( kpc) ones tend to be blue. We also find that galaxies with multiple cores tend to be brighter. Combined with previous results at , our result confirms that the average of bright ((0.3–1)) galaxies scales as with . We find that the ratio of re to virial radius is virtually constant at 3.3 ± 0.1% over a wide redshift range, where the virial radii of hosting dark matter halos are derived based on the abundance matching. This constant ratio is consistent with the disk formation model by Mo et al. with , where jd and md are the fractions of the angular momentum and mass within halos confined in the disks. A comparison with various types of local galaxies indicates that our galaxies are most similar to circumnuclear star-forming regions of barred galaxies in the sense that a sizable amount of stars are forming in a very small area.