The ALPINE-ALMA [CII] Survey: Dust emission effective radius up to 3 kpc in the Early Universe
arxiv(2024)
摘要
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]158μm 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
sizes as large as those measured.
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