A T-Dwarf candidate from <i>JWST</i> early release NIRCam data

Abstract We present a distant T-type brown dwarf candidate at ≈2.55 kpc discovered in the Cosmic Evolution Early Release Science (CEERS) fields by James Webb Space Telescope (JWST) NIRCam. In addition to superb sensitivity, we utilised 7 filters from JWST near-IR and thus is advantageous finding faint, previously unseen dwarfs. From model spectra new JWST/NIRCam filter wavelengths, selection criteria of F115W-F277W&amp;lt;-0.8 F277W-F444W&amp;gt;1.1 were chosen target spectrum features dwarfs having temperatures 500 K 1300 K. Searching through data Observations (ERO) (ERS), find 1 promising CEERS field. The result SED fitting suggested an early T spectral type with low effective temperature Teff ≈1300 K, surface gravity log g ≈ 5.25 cms−2, eddy diffusion parameter logKzz cm2s−1, which indicates age ≈1.8 Gyr mass ≈0.05 M⊙. contrast typically found within several hundred parsecs, estimated distance source kpc, showing JWST’s power extend search much larger distance.