articleThe Astrophysical JournalJun 1, 2024GOLD OA

What Is the Nature of Little Red Dots and what Is Not, MIRI SMILES Edition

PGPablo G. Pérez‐GonzálezGBGuillermo BarroGHG. H. RiekeJLJianwei LyuMRMarcia Rieke

Centro de Astrobiología · University of the Pacific · +9 more institutions

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Abstract

Abstract We study 31 little red dots (LRD) detected by JADES/NIRCam and covered by the SMILES/MIRI survey, of which ∼70% are detected in the two bluest MIRI bands and 40% in redder MIRI filters. The median/quartiles redshifts are z = 6.9 5.9 7.7 (55% spectroscopic). The spectral slopes flatten in the rest-frame near-infrared, consistent with a 1.6 μ m stellar bump but bluer than direct pure emission from active galactic nuclei (AGN) tori. The apparent dominance of stellar emission at these wavelengths for many LRDs expedites stellar mass estimation: the median/quartiles are log M ⋆ / M ⊙ = 9.4 9.1 9.7 . The number density of LRDs is 10 −4.0±0.1 Mpc −3 , accounting for 14% ± 3%…

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  • Physics
  • Algorithm
  • Computer science
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