Infrared capabilities of JWST reveal earliest galaxies in the young universe AAS_Publishing arxiv
Until now, our knowledge of the extragalactic Universe at mid-IR wavelengths was limited to rare active galactic nuclei and the brightest normal galaxies up to z~3. The advent of the JWST with its Mid-Infrared Instrument will revolutionise the ability of the mid-IR regime as a key wavelength domain to probe the high-z Universe. In this work we present a first study of JWST MIRI 7.7 micron sources selected with > 3 sigma significance from the lensing cluster field SMACS J0723.3-7327.
We find that this 7.7 micron galaxy sample is mainly composed of normal galaxies up to z=4 and has a tail of about 2% of sources at higher redshifts to z~ 9-10. The vast majority of our galaxies have [3.6]-[7.7]<0 colours and very few of them need high dust extinction values for their SED fitting. The resulting lensing-corrected stellar masses span the range 10^7-10^{11} Msun. Overall, our results clearly show that the first MIRI 7.
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