학술논문
The ALPINE-ALMA [CII] Survey: Dust emission effective radius up to 3 kpc in the Early Universe
Document Type
Working Paper
Author
Pozzi, F.; Calura, F.; D'Amato, Q.; Gavarente, M.; Bethermin, M.; Boquien, M.; Casasola, V.; Cimatti, A.; Cochrane, R.; Dessauges-Zavadsky, M.; Enia, A.; Esposito, F.; Faisst, A. L.; Gilli, R.; Ginolfi, M.; Gobat, R.; Gruppioni, C.; Hayward, C. C.; Ibar, E.; Koekemoer, A. M.; Lemaux, B. C.; Magdis, G. E.; Molina, J.; Talia, M.; Vallini, L.; Vergani, D.; Zamorani, G.
Source
A&A 686, A187 (2024)
Subject
Language
Abstract
Measurements of the size of dust continuum emission are an important tool for constraining the spatial extent of star formation and hence the build-up of stellar mass. Compact dust emission has generally been observed at Cosmic Noon (z~2-3). However, at earlier epochs, toward the end of the Reionization (z~4-6), only the sizes of a handful of IR-bright galaxies have been measured. In this work, we derive the dust emission sizes of main-sequence galaxies at z~5 from the ALPINE survey. We measure the dust effective radius r_e,FIR in the uv-plane in Band 7 of ALMA for seven ALPINE galaxies with resolved emission and we compare it with rest-frame UV and [CII]158$\mu$m measurements. We study the r_e,FIR-L_IR scaling relation by considering our dust size measurements and all the data in literature at z~4-6. Finally, we compare our size measurements with predictions from simulations. The dust emission in the selected ALPINE galaxies is rather extended (r_e,FIR~1.5-3 kpc), similar to [CII]158 um but a factor of ~2 larger than the rest-frame UV emission. Putting together all the measurements at z~5, spanning 2 decades in luminosity from L_IR ~ 10^11 L_sun to L_IR ~ 10^13 L_sun, the data highlight a steeply increasing trend of the r_e,FIR-L_IR relation at L_IR< 10^12 L_sun, followed by a downturn and a decreasing trend at brighter luminosities. Finally, simulations that extend up to the stellar masses of the ALPINE galaxies considered in the present work predict a sub-set of galaxies (~25% at 10^10 M_sun < M_star < 10^11 M_sun) with sizes as large as those measured.
Comment: 8 pages, Accepted by A&A
Comment: 8 pages, Accepted by A&A