Discovery of a Little Red Dot candidate at $z\gtrsim10$ in COSMOS-Web based on MIRI-NIRCam selection
Discovery of a Little Red Dot candidate at $z\gtrsim10$ in COSMOS-Web based on MIRI-NIRCam selection
JWST has revealed a new high-redshift population called little red dots (LRDs). Since LRDs may be in the early phase of black hole growth, identifying them in the early universe is crucial for understanding the formation of the first supermassive black holes. However, no robust LRD candidates have been identified at $z>10$, because commonly-used NIRCam photometry covers wavelengths up to $\sim5\,{\rm μm}$ and is insufficient to capture the characteristic V-shaped spectral energy distributions (SEDs) of LRDs. In this study, we present the first search for $z\gtrsim10$ LRD candidates using both NIRCam and MIRI imaging from COSMOS-Web, which provides the largest joint NIRCam-MIRI coverage to date ($0.20\,{\rm deg^2}$). Taking advantage of MIRI/F770W to remove contaminants, we identify one robust candidate, CW-LRD-z10 at $z_{\rm phot}=10.5^{+0.7}_{-0.6}$ with $M_{\rm UV}=-19.9^{+0.1}_{-0.2}\,{\rm mag}$. CW-LRD-z10 exhibits a compact morphology, a distinct V-shaped SED, and a non-detection in F115W, all consistent with being an LRD at $z\sim10$. Based on this discovery, we place the first constraint on the number density of LRDs at $z\sim10$ with $M_{\rm UV}\sim-20$ of $1.2^{+2.7}_{-1.0}\times10^{-6}\,{\rm Mpc^{-3}\,mag^{-1}}$, suggesting that the fraction of LRDs among the overall galaxy population increases with redshift, reaching $\sim3\%$ at $z\sim10$. Although deep spectroscopy is necessary to confirm the redshift and the nature of CW-LRD-z10, our results imply that LRDs may be a common population at $z>10$, playing a key role in the first supermassive black hole formation.
Takumi S. Tanaka、Hollis B. Akins、Yuichi Harikane、John D. Silverman、Caitlin M. Casey、Kohei Inayoshi、Jan-Torge Schindler、Kazuhiro Shimasaku、Dale D. Kocevski、Masafusa Onoue、Andreas L. Faisst、Brant Robertson、Vasily Kokorev、Marko Shuntov、Anton M. Koekemoer、Maximilien Franco、Daizhong Liu、Anthony J. Taylor、Jeyhan S. Kartaltepe、Sarah E. Bosman、Jaclyn B. Champagne、Koki Kakiichi、Zijian Zhang、Sophie L. Newman、Darshan Kakkad、Qinyue Fei、Seiji Fujimoto、Mingyu Li、Steven L. Finkelstein、Zi Jian Li、Erini Lambrides、Laura Sommovigo、Jorge A. Zavala、Kei Ito、Zhaoxuan Liu、Ezequiel Treister、Manuel Aravena、Ghassem Gozaliasl、Haowen Zhang、Hossein Hatamnia、Hiroya Umeda、Akio K. Inoue、Jinyi Yang、Makoto Ando、Junya Arita、Xuheng Ding、Suin Matsui、Yuki Shibanuma、Georgios Magdis、Ming-Yang Zhuang、Xiaohui Fan、Zihao Li、Weizhe Liu、Jianwei Lyu、Jason Rhodes、Sune Toft、Feige Wang、Siwei Zou、Rafael C. Arango-Toro、A. J. Battisti、Steven Gillman、Ali Ahmad Khostovan、Arianna S. Long
天文学
Takumi S. Tanaka,Hollis B. Akins,Yuichi Harikane,John D. Silverman,Caitlin M. Casey,Kohei Inayoshi,Jan-Torge Schindler,Kazuhiro Shimasaku,Dale D. Kocevski,Masafusa Onoue,Andreas L. Faisst,Brant Robertson,Vasily Kokorev,Marko Shuntov,Anton M. Koekemoer,Maximilien Franco,Daizhong Liu,Anthony J. Taylor,Jeyhan S. Kartaltepe,Sarah E. Bosman,Jaclyn B. Champagne,Koki Kakiichi,Zijian Zhang,Sophie L. Newman,Darshan Kakkad,Qinyue Fei,Seiji Fujimoto,Mingyu Li,Steven L. Finkelstein,Zi Jian Li,Erini Lambrides,Laura Sommovigo,Jorge A. Zavala,Kei Ito,Zhaoxuan Liu,Ezequiel Treister,Manuel Aravena,Ghassem Gozaliasl,Haowen Zhang,Hossein Hatamnia,Hiroya Umeda,Akio K. Inoue,Jinyi Yang,Makoto Ando,Junya Arita,Xuheng Ding,Suin Matsui,Yuki Shibanuma,Georgios Magdis,Ming-Yang Zhuang,Xiaohui Fan,Zihao Li,Weizhe Liu,Jianwei Lyu,Jason Rhodes,Sune Toft,Feige Wang,Siwei Zou,Rafael C. Arango-Toro,A. J. Battisti,Steven Gillman,Ali Ahmad Khostovan,Arianna S. Long.Discovery of a Little Red Dot candidate at $z\gtrsim10$ in COSMOS-Web based on MIRI-NIRCam selection[EB/OL].(2025-07-31)[2025-08-11].https://arxiv.org/abs/2508.00057.点此复制
评论