2023
DOI: 10.1051/0004-6361/202347052
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CEERS: MIRI deciphers the spatial distribution of dust-obscured star formation in galaxies at 0.1 < z < 2.5

Benjamin Magnelli,
Carlos Gómez-Guijarro,
David Elbaz
et al.

Abstract: Aims. We study the stellar (i.e., rest-optical) and dust-obscured star-forming (i.e., rest-mid-infrared) morphologies (i.e., sizes and Sérsic indices) of star-forming galaxies (SFGs) at 0.1 < z < 2.5. Methods. We combined Hubble Space Telescope (HST) images from the Cosmic Assembly Near-infrared Deep Extragalactic Legacy Survey (CANDELS) with JWST images from the Cosmic Evolution Early Release Science (CEERS) survey to measure the stellar and dust-obscured star formation distributions of 69 SFGs. Rest-mi… Show more

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Cited by 10 publications
(5 citation statements)
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“…The inferred rest-frame NIR sizes are smaller compared to those observed in the rest-frame optical, implying a negative color gradient (i.e., the galaxies have redder centers). A similar trend has also been observed in other galaxy populations (e.g., Chen et al 2022;Suess et al 2022;Gillman et al 2023;Magnelli et al 2023), including local face-on spiral galaxies (e.g., Casasola et al 2017), and in studies of stellar-mass maps (e.g., Wuyts et al 2012;van der Wel et al 2024), and can be driven by differences in the properties of the stars, such as their age, or by dust extinction. The results can thus be attributed to the presence or formation of an older, more centrally concentrated stellar population (such as a bulge) and/or stronger dust extinction in the center (potentially linked to compact central star formation), where both lead to a "flatter" distribution in the rest-frame optical bands.…”
Section: Hst Versus Jwst Sizes and Color Gradientssupporting
confidence: 78%
“…The inferred rest-frame NIR sizes are smaller compared to those observed in the rest-frame optical, implying a negative color gradient (i.e., the galaxies have redder centers). A similar trend has also been observed in other galaxy populations (e.g., Chen et al 2022;Suess et al 2022;Gillman et al 2023;Magnelli et al 2023), including local face-on spiral galaxies (e.g., Casasola et al 2017), and in studies of stellar-mass maps (e.g., Wuyts et al 2012;van der Wel et al 2024), and can be driven by differences in the properties of the stars, such as their age, or by dust extinction. The results can thus be attributed to the presence or formation of an older, more centrally concentrated stellar population (such as a bulge) and/or stronger dust extinction in the center (potentially linked to compact central star formation), where both lead to a "flatter" distribution in the rest-frame optical bands.…”
Section: Hst Versus Jwst Sizes and Color Gradientssupporting
confidence: 78%
“…The mid-IR probes emission from polycyclic aromatic hydrocarbons (PAHs), a tracer of star formation from heating in photodissociation regions (e.g., Ronayne et al 2023). Early studies with JWST/MIRI (Magnelli et al 2023;Shen et al 2023) show that the effective radii of galaxies at 0.2 < z < 2.5 over a range of stellar mass measured in the mid-IR emission are more compact (with smaller effective radii) than the light in the rest-frame optical/ near-IR (which traces stellar light), the near-UV light (which traces the direct continuum from young stars with ∼100 Myr lifetimes), or the Hα emission. One explanation for this is that the mid-IR emission tracks star formation over longer timescales than either the UV or Hα emission, as longer-lived stars (with lifetimes of 500 Myr-1 Gyr) can heat PAHs efficiently (Salim et al 2009;Kennicutt & Evans 2012;Salim & Narayanan 2020).…”
Section: Spatially Resolved Star Formation Histories In Galaxiesmentioning
confidence: 99%
“…The weak mid-IR emission is then attributable to most of the dust in low-mass galaxies being colder. Morphological studies with MIRI and NIRcam may be able probe the extent of the dust and stars in z ∼ 1-2 galaxies (Magnelli et al 2023;Shen et al 2023).…”
Section: The Nature Of Mid-ir Weak Sourcesmentioning
confidence: 99%