A Comprehensive Photometric Selection of `Little Red Dots' in MIRI Fields: An IR-Bright LRD at $z=3.1386$ with Warm Dust Emission
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| Autores principales: | , , , , , , , , , , , , , , , |
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2024
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| author | Barro, Guillermo Perez-Gonzalez, Pablo G. Kocevski, Dale D. McGrath, Elizabeth J. Leung, Gene C. K. Cullen, Fergus Dunlop, James S. Ellis, Richard S. Finkelstein, Steven L. Grogin, Norman A. Illingworth, Garth Kartaltepe, Jeyhan S. Koekemoer, Anton M. Lucas, Ray A. McLure, Ross J. Yang, Guang |
| author_facet | Barro, Guillermo Perez-Gonzalez, Pablo G. Kocevski, Dale D. McGrath, Elizabeth J. Leung, Gene C. K. Cullen, Fergus Dunlop, James S. Ellis, Richard S. Finkelstein, Steven L. Grogin, Norman A. Illingworth, Garth Kartaltepe, Jeyhan S. Koekemoer, Anton M. Lucas, Ray A. McLure, Ross J. Yang, Guang |
| contents | JWST has revealed a population of compact `Little Red Dots' (LRDs) at $z\gtrsim4$, with red rest-frame optical and blue UV colors. These objects are likely compact dusty starbursts or heavily reddened AGNs, playing a pivotal role in early black hole growth, dust production, and stellar assembly. We introduce a new photometric selection to identify LRDs over a broad range in redshifts and rest-frame UV-to-NIR colors enabling a more complete census of the population. This method identifies 248 LRDs with F444W$<27$ mag over 263 arcmin$^2$ in the JADES, PRIMER-COSMOS, and UDS fields with MIRI coverage, increasing the number density by $\times$1.7 compared to previous samples, suggesting that previous census were underestimated. Most LRDs are detected in MIRI/F770W but only 7% (17) are detected in F1800W. We use MIRI-based rest-frame [1$-$3 $μ$m] colors to trace dust emission. F1800W-detected LRDs have a median [1$-$3 $μ$m]$=1.5$ mag, with a broad scatter indicative of diverse dust emission properties. About 20% exhibit [1$-$3 $μ$m]$<1$ mag colors consistent with negligible dust emission, but the majority show significant dust emission at 3 $μ$m (f$^{\rm dust}_{3μm}\lesssim0.8$) from the galaxy ISM or a hot-dust-deficient AGN torus. A correlation between bluer UV-to-NIR colors and stronger IR emission suggests that the bluest LRDs may resemble unobscured QSOs. We report a LRD at $z_{\rm spec}=3.1386$, detected in MIRI, Spitzer/MIPS, and Herschel/PACS. Its IR SED rises steeply at $λ_{\rm rest}>6~μ$m and peaks near $\sim40~μ$m, providing the first direct evidence of warm dust emission (T$=50-100$ K) in a LRD. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2412_01887 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | A Comprehensive Photometric Selection of `Little Red Dots' in MIRI Fields: An IR-Bright LRD at $z=3.1386$ with Warm Dust Emission Barro, Guillermo Perez-Gonzalez, Pablo G. Kocevski, Dale D. McGrath, Elizabeth J. Leung, Gene C. K. Cullen, Fergus Dunlop, James S. Ellis, Richard S. Finkelstein, Steven L. Grogin, Norman A. Illingworth, Garth Kartaltepe, Jeyhan S. Koekemoer, Anton M. Lucas, Ray A. McLure, Ross J. Yang, Guang Astrophysics of Galaxies JWST has revealed a population of compact `Little Red Dots' (LRDs) at $z\gtrsim4$, with red rest-frame optical and blue UV colors. These objects are likely compact dusty starbursts or heavily reddened AGNs, playing a pivotal role in early black hole growth, dust production, and stellar assembly. We introduce a new photometric selection to identify LRDs over a broad range in redshifts and rest-frame UV-to-NIR colors enabling a more complete census of the population. This method identifies 248 LRDs with F444W$<27$ mag over 263 arcmin$^2$ in the JADES, PRIMER-COSMOS, and UDS fields with MIRI coverage, increasing the number density by $\times$1.7 compared to previous samples, suggesting that previous census were underestimated. Most LRDs are detected in MIRI/F770W but only 7% (17) are detected in F1800W. We use MIRI-based rest-frame [1$-$3 $μ$m] colors to trace dust emission. F1800W-detected LRDs have a median [1$-$3 $μ$m]$=1.5$ mag, with a broad scatter indicative of diverse dust emission properties. About 20% exhibit [1$-$3 $μ$m]$<1$ mag colors consistent with negligible dust emission, but the majority show significant dust emission at 3 $μ$m (f$^{\rm dust}_{3μm}\lesssim0.8$) from the galaxy ISM or a hot-dust-deficient AGN torus. A correlation between bluer UV-to-NIR colors and stronger IR emission suggests that the bluest LRDs may resemble unobscured QSOs. We report a LRD at $z_{\rm spec}=3.1386$, detected in MIRI, Spitzer/MIPS, and Herschel/PACS. Its IR SED rises steeply at $λ_{\rm rest}>6~μ$m and peaks near $\sim40~μ$m, providing the first direct evidence of warm dust emission (T$=50-100$ K) in a LRD. |
| title | A Comprehensive Photometric Selection of `Little Red Dots' in MIRI Fields: An IR-Bright LRD at $z=3.1386$ with Warm Dust Emission |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2412.01887 |