Year: 2020
Type: article
Abstract: We present 0.″2 resolution Atacama Large Millimeter/submillimeter Array (ALMA) observations at 870 μm 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 μm and James Webb Space Telescope 3–4 μm will explicitly verify this scenario.
Source: The Astrophysical Journal
Authors: Ken-ichi Tadaki, Sirio Belli, Andreas Burkert, Avishai Dekel, Natascha M. Förster Schreiber, Reinhard Genzel, Masao Hayashi, Rodrigo Herrera-Camus, Tadayuki Kodama, Kotaro Kohno, Yusei Koyama, Minju M. Lee, Dieter Lutz, Lamiya Mowla, Erica J. Nelson, Alvio Renzini, Tomoko L. Suzuki, Linda J. Tacconi, Hannah Übler, Emily Wisnioski, Stijn Wuyts
Institutions: National Astronomical Observatory of Japan, Center for Astrophysics Harvard & Smithsonian, Max Planck Institute for Extraterrestrial Physics, Ludwig-Maximilians-Universität München, Hebrew University of Jerusalem, University of Concepción, Tohoku University, Research Center for the Early Universe, The University of Tokyo, Yale University, Osservatorio Astronomico di Padova, Australian National University, ASTRO-3D, ARC Centre of Excellence for All-sky Astrophysics, University of Bath
Language: English
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: bronze
Awards: Spatially Resolving Submillimeter galaxies with ALMA, G3456374072, Revealing the physical processes that accelerate and decelerate galaxy formation, G4974873094, High-resolution Paschen-alpha mapping of galaxy transition processes with Subaru AO-assisted observations, Onsala space observatory infrastructure
OpenAlex ID: W3083090489