Dust emission from the bulk of galaxies in the Epoch of Reionisation

Kód výsledku v 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>

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

Dust emission from the bulk of galaxies in the Epoch of Reionisation

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

Dust emission from the bulk of galaxies in the Epoch of Reionisation

Popis výsledku anglicky

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.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10308 - Astronomy (including astrophysics,space science)

Projekt

—

Návaznosti

—

Rok uplatnění

2025

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Astronomy & Astrophysics

ISSN

0004-6361

e-ISSN

1432-0746

Svazek periodika

700

Číslo periodika v rámci svazku

Aug.

Stát vydavatele periodika

FR - Francouzská republika

Počet stran výsledku

13

Strana od-do

A277

Kód UT WoS článku

001565122300012

EID výsledku v databázi Scopus

2-s2.0-105014905606