--- res: bibo_abstract: - "Aims. This paper utilises the James Webb Space Telescope (JWST) Mid-Infrared Instrument (MIRI) to extend the observational studies of dust and polycyclic aromatic hydrocarbon (PAH) emission to a new mass and star formation rate (SFR) parameter space beyond our local Universe. The combination of fully sampled spectral energy distributions (SEDs) with multiple mid-infrared (mid-IR) bands and the unprecedented sensitivity of MIRI allows us to investigate dust obscuration and PAH behaviour from z = 0.7 up to z = 2 in typical main-sequence galaxies. Our focus is on constraining the evolution of PAH strength and the dust-obscured luminosity fraction before and during cosmic noon, the epoch of peak star formation activity in the Universe.\r\n\r\nMethods. In this study, we utilise MIRI multi-band imaging data from the SMILES survey (5 to 25 μm), complemented with NIRCam photometry from the JADES survey (1 to 5 μm), available HST photometry (0.4 to 0.9 μm), and spectroscopic redshifts from the FRESCO and JADES surveys in GOODS-S for 443 star-forming (without dominant active galactic nucleus (AGN)) galaxies at z = 0.7 − 2.0. This redshift range was chosen to ensure that the MIRI data cover mid-IR dust emission. Our methodology involved employing ultraviolet (UV) to IR energy balance SED fitting to robustly constrain the fraction of dust mass in PAHs and dust-obscured luminosity. Additionally, we inferred dust sizes from MIRI 15 μm imaging data, enhancing our understanding of the physical characteristics of dust within these galaxies.\r\n\r\nResults. We find a strong correlation between the fraction of dust in PAHs (PAH fraction, qPAH) with stellar mass. Moreover, the sub-sample with robust qPAH measurements (N = 216) shows a similar behaviour between qPAH and gas-phase metallicity to that at z ∼ 0, suggesting a universal relation: qPAH is constant (∼3.4%) above a metallicity of Z ∼ 0.5 Z⊙ and decreases to < 1% at metallicities ≲0.3 Z⊙. This indicates that metallicity is a good indicator of the interstellar medium properties that affect the balance between the formation and destruction of PAHs. The lack of a redshift evolution from z ∼ 0 − 2 also implies that above Z ∼ 0.5 Z⊙ the PAH emission effectively traces obscured luminosity and the previous locally calibrated PAH-SFR calibrations remain applicable in this metallicity regime. We observe a strong correlation between the obscured UV luminosity fraction (ratio of obscured to total luminosity) and stellar mass. Above the stellar mass of M* > 5 × 109 M⊙, on average, more than half of the emitted luminosity is obscured, while there exists a non-negligible population of lower-mass galaxies with > 50% obscured fractions. At a fixed mass, the obscured fraction correlates with SFR surface density. This is a result of higher dust covering fractions in galaxies with more compact star-forming regions. Similarly, galaxies with high IRX (IR to UV luminosity) at a given mass or UV continuum slope (β) tend to have higher ΣSFR and shallower attenuation curves, owing to their higher effective dust optical depths and more compact star-forming regions.@eng" bibo_authorlist: - foaf_Person: foaf_givenName: Irene foaf_name: Shivaei, Irene foaf_surname: Shivaei - foaf_Person: foaf_givenName: Stacey foaf_name: Alberts, Stacey foaf_surname: Alberts - foaf_Person: foaf_givenName: Michael foaf_name: Florian, Michael foaf_surname: Florian - foaf_Person: foaf_givenName: George foaf_name: Rieke, George foaf_surname: Rieke - foaf_Person: foaf_givenName: Stijn foaf_name: Wuyts, Stijn foaf_surname: Wuyts - foaf_Person: foaf_givenName: Sarah foaf_name: Bodansky, Sarah foaf_surname: Bodansky - foaf_Person: foaf_givenName: Andrew J. foaf_name: Bunker, Andrew J. foaf_surname: Bunker - foaf_Person: foaf_givenName: Alex J. foaf_name: Cameron, Alex J. foaf_surname: Cameron - foaf_Person: foaf_givenName: Mirko foaf_name: Curti, Mirko foaf_surname: Curti - foaf_Person: foaf_givenName: Francesco foaf_name: Da'Eugenio, Francesco foaf_surname: Da'Eugenio - foaf_Person: foaf_givenName: Ugne foaf_name: Dudzevičiūte, Ugne foaf_surname: Dudzevičiūte - foaf_Person: foaf_givenName: Zhiyuan foaf_name: Ji, Zhiyuan foaf_surname: Ji - foaf_Person: foaf_givenName: Benjamin D. foaf_name: Johnson, Benjamin D. foaf_surname: Johnson - foaf_Person: foaf_givenName: Ivan foaf_name: Kramarenko, Ivan foaf_surname: Kramarenko foaf_workInfoHomepage: http://www.librecat.org/personId=9a9394cb-3200-11ee-973b-f5ba2a8b16e4 orcid: 0000-0001-5346-6048 - foaf_Person: foaf_givenName: Jianwei foaf_name: Lyu, Jianwei foaf_surname: Lyu - foaf_Person: foaf_givenName: Jorryt J foaf_name: Matthee, Jorryt J foaf_surname: Matthee foaf_workInfoHomepage: http://www.librecat.org/personId=7439a258-f3c0-11ec-9501-9df22fe06720 orcid: 0000-0003-2871-127X - foaf_Person: foaf_givenName: Jane foaf_name: Morrison, Jane foaf_surname: Morrison - foaf_Person: foaf_givenName: Rohan foaf_name: Naidu, Rohan foaf_surname: Naidu - foaf_Person: foaf_givenName: Pablo G. foaf_name: Pérez-González, Pablo G. foaf_surname: Pérez-González - foaf_Person: foaf_givenName: Naveen foaf_name: Reddy, Naveen foaf_surname: Reddy - foaf_Person: foaf_givenName: Brant foaf_name: Robertson, Brant foaf_surname: Robertson - foaf_Person: foaf_givenName: Yang foaf_name: Sun, Yang foaf_surname: Sun - foaf_Person: foaf_givenName: Sandro foaf_name: Tacchella, Sandro foaf_surname: Tacchella - foaf_Person: foaf_givenName: Katherine foaf_name: Whitaker, Katherine foaf_surname: Whitaker - foaf_Person: foaf_givenName: Christina C. foaf_name: Williams, Christina C. foaf_surname: Williams - foaf_Person: foaf_givenName: Christopher N.A. foaf_name: Willmer, Christopher N.A. foaf_surname: Willmer - foaf_Person: foaf_givenName: Joris foaf_name: Witstok, Joris foaf_surname: Witstok - foaf_Person: foaf_givenName: Mengyuan foaf_name: Xiao, Mengyuan foaf_surname: Xiao - foaf_Person: foaf_givenName: Yongda foaf_name: Zhu, Yongda foaf_surname: Zhu bibo_doi: 10.1051/0004-6361/202449579 bibo_volume: 690 dct_date: 2024^xs_gYear dct_identifier: - UT:001381135700006 dct_isPartOf: - http://id.crossref.org/issn/0004-6361 - http://id.crossref.org/issn/1432-0746 dct_language: eng dct_publisher: EDP Sciences@ dct_title: A new census of dust and polycyclic aromatic hydrocarbons at z = 0.7-2 with JWST MIRI@ ...