| Title: |
What Is the Nature of Little Red Dots and what Is Not, MIRI SMILES Edition |
| Authors: |
Pablo G. Pérez-González, Guillermo Barro, George H. Rieke, Jianwei Lyu, Marcia Rieke, Stacey Alberts, Christina C. Williams, Kevin Hainline, Fengwu Sun, Dávid Puskás, Marianna Annunziatella, William M. Baker, Andrew J. Bunker, Eiichi Egami, Zhiyuan Ji, Benjamin D. Johnson, Brant Robertson, Bruno Rodríguez Del Pino, Wiphu Rujopakarn, Irene Shivaei, Sandro Tacchella, Christopher N. A. Willmer, Chris Willott |
| Source: |
The Astrophysical Journal, Vol 968, Iss 1, p 4 (2024) |
| Publisher Information: |
IOP Publishing, 2024. |
| Publication Year: |
2024 |
| Collection: |
LCC:Astrophysics |
| Subject Terms: |
Galaxy formation, Galaxy evolution, High-redshift galaxies, Galaxy stellar content, Stellar populations, Broad band photometry, Astrophysics, QB460-466 |
| More Details: |
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 $\mathrm{log}{M}_{\star }/{M}_{\odot }={9.4}_{9.1}^{9.7}$ . The number density of LRDs is 10 ^−4.0±0.1 Mpc ^−3 , accounting for 14% ± 3% of the global population of galaxies with similar redshifts and masses. The rest-frame near-/mid-infrared (2–4 μ m) spectral slope reveals significant amounts of warm dust (bolometric attenuation ∼3–4 mag). Our spectral energy distribution modeling implies the presence of 10 mag. We find a wide variety in the nature of LRDs. However, the best-fitting models for many of them correspond to extremely intense and compact starburst galaxies with mass-weighted ages 5–10 Myr, very efficient in producing dust, with their global energy output dominated by the direct (in the flat rest-frame ultraviolet and optical spectral range) and dust-recycled emission from OB stars with some contribution from an obscured AGN (in the infrared). |
| Document Type: |
article |
| File Description: |
electronic resource |
| Language: |
English |
| ISSN: |
1538-4357 |
| Relation: |
https://doaj.org/toc/1538-4357 |
| DOI: |
10.3847/1538-4357/ad38bb |
| Access URL: |
https://doaj.org/article/54ee7a6a14e44e1fa63d0e622b2a8209 |
| Accession Number: |
edsdoj.54ee7a6a14e44e1fa63d0e622b2a8209 |
| Database: |
Directory of Open Access Journals |
