2025ApJ...995...21T

Query : 2025ApJ...995...21T

2025ApJ...995...21T - Astrophys. J., 995, 21 (2025/December-2)

Discovery of a Little Red Dot Candidate at z ≳ 10 in COSMOS-web Based on MIRI-NIRCam Selection.

TANAKA T.S., AKINS H.B., HARIKANE Y., SILVERMAN J.D., CASEY C.M., INAYOSHI K., SCHINDLER J.-T., SHIMASAKU K., KOCEVSKI D.D., ONOUE M., FAISST A.L., ROBERTSON B.E., KOKOREV V., SHUNTOV M., KOEKEMOER A.M., FRANCO M., EGAMI E., LIU D., TAYLOR A.J., KARTALTEPE J.S., BOSMAN S.E.I., CHAMPAGNE J.B., KAKIICHI K., HARISH S., ZHANG Z., NEWMAN S.L., KAKKAD D., FEI Q., FUJIMOTO S., LI M., FINKELSTEIN S.L., LI Z.-J., LAMBRIDES E., SOMMOVIGO L., ZAVALA J.A., ITO K., LIU Z., TREISTER E., ARAVENA M., GOZALIASL G., ZHANG H., HATAMNIA H., UMEDA H., INOUE A.K., YANG J., ANDO M., ARITA J., DING X., MATSUI S., SHIBANUMA Y., MAGDIS G., ZHUANG M., FAN X., LI Z., LIU W., LYU J., RHODES J., TOFT S., WANG F., ZOU S., ARANGO-TORO R.C., BATTISTI A.J., GILLMAN S., KHOSTOVAN A.A., LONG A.S., MOBASHER B. and SANDERS D.B.

Abstract (from CDS):

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 ∼5 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 ≳ 10 LRD candidates using both NIRCam and MIRI imaging from COSMOS-Web, which provides the largest joint NIRCam-MIRI coverage to date (0.20 deg2). Taking advantage of MIRI/F770W to remove contaminants, we identify one robust candidate, CW-LRD-z10 at ${z}_{{\rm{phot}}}=10.{5}_{-0.6}^{+0.7}$ with ${M}_{{\rm{UV}}}=-19.{9}_{-0.2}^{+0.1}\,{\rm{mag}}$. CW-LRD-z10 exhibits a compact morphology, a distinct V-shaped SED, and a nondetection in F115W, all consistent with being an LRD at z ∼ 10. Based on this discovery, we place the first constraint on the number density of LRDs at z ∼ 10 with MUV ∼ -20 of $1.{2}_{-1.0}^{+2.7}\times 1{0}^{-6}\,{{\rm{Mpc}}}^{-3}\,{{\rm{mag}}}^{-1}$, suggesting that the fraction of LRDs among the overall galaxy population increases with redshift, reaching ∼3% at z ∼ 10. 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.

Abstract Copyright: © 2025. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): Active galactic nuclei - Galaxy evolution - High-redshift galaxies - Galaxy formation

Nomenclature: Fig. 3, Table2: [TAH2025] CW-LRD-z10 N=1.

Status at CDS : Acronym for new objects described in the dictionary of nomenclature and being created in SIMBAD. // All or part of tables of objects will be ingested in SIMBAD with priority 1.

Simbad objects: 10

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Number of rows : 10
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 UNCOVER DR2 45758 G 00 13 54.897 -30 20 43.93           ~ 26 0
2 [CFT2022] GHZ2 G 00 13 59.760 -30 19 29.07           ~ 91 0
3 [CFT2023] UHZ1 EmG 00 14 16.096 -30 22 40.33           ~ 39 0
4 JADES-GS NC 18044 EmG 03 32 17.8244 -27 53 09.316           ~ 18 0
5 JADES-GS+053.08294-27.85563 EmG 03 32 19.905 -27 51 20.28           ~ 50 0
6 NAME CW-LRD-z10 G 10 00 20.1836 +02 27 14.022           ~ 1 0
7 NAME MOM-z14 G 10 00 22.3981 +02 16 23.386           ~ 9 0
8 NAME CAPERS-LRD-z9 AGN 10 00 32.7008 +02 18 28.907           ~ 8 0
9 [OBV2016] GN-z11 EmG 12 36 25.46 +62 14 31.4           ~ 247 0
10 [FLB2024] CEERS-98518 G 14 19 16.107 +52 44 54.03           ~ 4 0

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