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Tadaki, Ken-ichi; Belli, Sirio; Burkert, Andreas; Dekel, Avishai; Förster Schreiber, Natascha M.; Genzel, Reinhard; Hayashi, Masao; Herrera-Camus, Rodrigo; Kodama, Tadayuki; Kohno, Kotaro; Koyama, Yusei; Lee, Minju M.; Lutz, Dieter; Mowla, Lamiya; Nelson, Erica J.; Renzini, Alvio; Suzuki, Tomoko L.; Tacconi, Linda J.; Übler, Hannah; Wisnioski, Emily; Wuyts, Stijn
The Astrophysical journal, 09/2020, Letnik: 901, Številka: 1Journal Article
We present 0 2 resolution Atacama Large Millimeter/submillimeter Array (ALMA) observations at 870 m in a stellar mass-selected sample of 85 massive ( ) star-forming galaxies (SFGs) at in the CANDELS/3D-Hubble Space Telescope fields of UDS and GOODS-S. We measure the effective radius of the rest-frame far-infrared (FIR) emission for 62 massive SFGs. They are distributed over wide ranges of FIR size from to . The effective radius of the FIR emission is smaller by a factor of than the effective radius of the optical emission and is smaller by a factor of than the half-mass radius. Taking into account potential extended components, the FIR size would change only by ∼10%. By combining the spatial distributions of the FIR and optical emission, we investigate how galaxies change the effective radius of the optical emission and the stellar mass within a radius of 1 kpc, . The compact starburst puts most of the massive SFGs on the mass-size relation for quiescent galaxies (QGs) at z ∼ 2 within 300 Myr if the current star formation activity and its spatial distribution are maintained. We also find that within 300 Myr, ∼38% of massive SFGs can reach the central mass of , which is around the boundary between massive SFGs and QGs. These results suggest an outside-in transformation scenario in which a dense core is formed at the center of a more extended disk, likely via dissipative in-disk inflows. Synchronized observations at ALMA 870 m and James Webb Space Telescope 3-4 m will explicitly verify this scenario.
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