The ALPINE-ALMA [CII] Survey: Dust emission effective radius up to 3 kpc in the Early Universe
2024
Online
report
Zugriff:
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
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The ALPINE-ALMA [CII] Survey: Dust emission effective radius up to 3 kpc in the Early Universe
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Autor/in / Beteiligte Person: | 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. |
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Veröffentlichung: | 2024 |
Medientyp: | report |
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