CEERS: MIRI deciphers the spatial distribution of dust-obscured star formation in galaxies at $0.1<z<2.5$

Author:

Benjamin Magnelli, Carlos Gómez-Guijarro, David Elbaz, Emanuele Daddi, Casey Papovich, Lu Shen, Pablo Arrabal Haro, Micaela B. Bagley, Eric F. Bell, Véronique Buat, Luca Costantin, Mark Dickinson, Steven L. Finkelstein, Jonathan P. Gardner, Eric F. Jiménez-Andrade, Jeyhan S. Kartaltepe, Anton M. Koekemoer, Yipeng Lyu, Pablo G. Pérez-González, Nor Pirzkal, Sandro Tacchella, Alexander de la Vega, Stijn Wuyts, Guang Yang, L. Y. Aaron Yung, Jorge Zavala

Keyword:

Astrophysics, Astrophysics of Galaxies, Astrophysics of Galaxies (astro-ph.GA), Cosmology and Nongalactic Astrophysics (astro-ph.CO)

journal:

A&A 678, A83 (2023)

date:

2023-05-29 16:00:00

Abstract

[Abridged] We combined HST images from the Cosmic Assembly Near-infrared Deep Extragalactic Legacy Survey with JWST images from the Cosmic Evolution Early Release Science (CEERS) survey to measure the stellar and dust-obscured star formation distributions of a mass-complete ($>10^{10}M_\odot$) sample of 69 star-forming galaxies (SFGs) at $0.1<z<2.5$. Rest-mid-infrared (rest-MIR) morphologies (sizes and S\'ersic indices) were determined using their sharpest Mid-InfraRed Instrument (MIRI) images dominated by dust emission. Rest-MIR S\'ersic indices were only measured for the brightest MIRI sources ($S/N>75$; 35 galaxies). At lower $S/N$, simulations show that simultaneous measurements of the size and S\'ersic index become unreliable. We extended our study to fainter sources ($S/N>10$; 69 galaxies) by fixing their S\'ersic index to unity. The S\'ersic index of bright galaxies ($S/N>75$) has a median value of 0.7, which, together with their axis ratio distribution, suggests a disk-like morphology in the rest-MIR. Galaxies above the main sequence (MS; i.e., starbursts) have rest-MIR sizes that are a factor 2 smaller than their rest-optical sizes. The median rest-optical to rest-MIR size ratio of MS galaxies increases with stellar mass, from 1.1 at $10^{9.8}M_\odot$ to 1.6 at $10^{11}M_\odot$. This mass-dependent trend resembles the one found in the literature between the rest-optical and rest-near-infrared sizes of SFGs, suggesting that it is due to radial color gradients affecting rest-optical sizes and that the sizes of the stellar and star-forming components of SFGs are, on average, consistent at all masses. There is, however, a small population of SFGs (15%) with a compact star-forming component embedded in a larger stellar structure. This could be the missing link between galaxies with an extended stellar component and those with a compact stellar component, the so-called blue nuggets.

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