Dust emission from the bulk of galaxies in the Epoch of Reionisation
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985815%3A90106%2F25%3A00646498" target="_blank" >RIV/67985815:90106/25:00646498 - isvavai.cz</a>
Result on the web
<a href="https://doi.org/10.1051/0004-6361/202453278" target="_blank" >https://doi.org/10.1051/0004-6361/202453278</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1051/0004-6361/202453278" target="_blank" >10.1051/0004-6361/202453278</a>
Alternative languages
Result language
angličtina
Original language name
Dust emission from the bulk of galaxies in the Epoch of Reionisation
Original language description
The excess of UV-bright galaxies observed at z > 10 has been one of the major surprises of the early JWST observations. Several explanations have been proposed to understand the mild change in space density of the UV-bright galaxies at these high redshifts, among them an evolution of dust attenuation properties in galaxies. However, our view of dust in primordial galaxies is limited towards a few tens of z similar to 7 galaxies, pre-selected from UV-optical observations, and are thus not necessarily representative of the bulk of the sources at these redshifts. In this work, we aim to constrain the dust properties of galaxies at 6 < z < 12 by making the most of the A(3)COSMOS database in the JADES/GOODS-South field. We stacked ALMA band 6 and 7 observations of 4464 JADES galaxies covered by the A(3)COSMOS database and used the measurements as constraints to perform UV-to-FIR SED modelling. We obtained tentative signals for the brightest UV galaxies (M-UV <19 mag) as well as for the most massive ones (logM(star)/M-circle dot > 9) at 6 < z < 7, and upper limits for fainter (M-UV >19 mag), lower-mass sources (logM(star)/M-circle dot < 9), or ones at higher redshift (z > 7). Fitting these 6 < z < 7 galaxies with ALMA constraints results in lower star formation rates (-0.4 dex) and FUV attenuation (-0.5 mag) for galaxies with logM(star)/M-circle dot > 8, compared to the fit without FIR. We extend the L-IR vs M-UV relation down to M-UV =19 mag and show a tentative breakdown of the relation at fainter UV magnitudes. The positions of the JADES z similar to 6.5 sample on the infrared excess (IRX) versus beta and IRX versus M-star diagrams are consistent with the ones of the ALPINE (z similar to 5.5) and REBELS (z similar to 6.5) samples, suggesting that the dust composition and content of our mass-selected sample are similar to the ones of these UV-selected galaxies. Extending our analysis of the infrared properties to z > 7 galaxies, we find a non-evolution of beta in the M-UV range probed by our sample (-17.24(-0.62)(+0.54)), and highlight the fact that samples from the literature are not representative of the bulk of galaxy populations at z > 6. We confirm a linear relation between A(V) and sSFR(-1) with a flatter slope than previously reported due to the use of ALMA constraints. Our results suggest that rapid and significant dust production has already happened by z similar to 7.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10308 - Astronomy (including astrophysics,space science)
Result continuities
Project
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Continuities
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Others
Publication year
2025
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Astronomy & Astrophysics
ISSN
0004-6361
e-ISSN
1432-0746
Volume of the periodical
700
Issue of the periodical within the volume
Aug.
Country of publishing house
FR - FRANCE
Number of pages
13
Pages from-to
A277
UT code for WoS article
001565122300012
EID of the result in the Scopus database
2-s2.0-105014905606