Abstract
We present a study of the mid-IR (MIR) emission of quiescent galaxies (QGs) beyond the local universe. Using deep JWST imaging in the SMACS-0723 cluster field we identify a mass-limited (M* > 109 M⊙) sample of intermediate redshift QGs (0.2 < z < 0.7) and perform modelling of their rest-frame UV to MIR photometry. We find that QGs exhibit a range of MIR spectra that are composed of a stellar continuum and a dust component that is 1–2 orders of magnitude fainter than that of star-forming galaxies. The observed scatter in the MIR spectra, especially at λrest > 5 μm, can be attributed to different dust continuum levels and/or the presence of polycyclic aromatic hydrocarbon (PAH) features. The latter would indicate enhanced 11.3 and 12.7 μm PAH strengths with respect to those at 6.2 and 7.7 μm, consistent with the observed spectra of local ellipticals and indicative of soft radiation fields. Finally, we augment the average UV to MIR spectrum of the population with cold dust and gas emission in the far-IR/millimetre, and construct a panchromatic UV to radio SED that can serve as a template for the future exploration of the interstellar medium of z > 0 QGs with ALMA and JWST.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
