An almost NIRCam-dark dusty star-forming galaxy at z=6.63
Clicks: 1
ID: 313541
2026
Article Quality & Performance Metrics
Overall Quality
Not rated
Combines reader engagement with the AI quality analysis. This
article has not been analysed, so there is no overall score —
reader engagement is measured and shown alongside.
Reader Engagement
0.0
/100
1 views
0 readers
AI Quality Assessment
Not analyzed
Readership in this journal
Ranked #638 of 908 articles by views in monthly notices of the royal astronomical society
Most read
Least read
Bar heights use a square-root scale. Only the 120 most-read articles are drawn; the journal has 908 in total.
Mint this article as an NFT
Not yet mintedCreate a permanent, verifiable on-chain record of this article on the Scimatic Network. The NFT is held in your Journament account, and you can withdraw it to your own wallet at any time.
5
SUSD
one-off · no wallet required
Abstract
Abstract We present AC-2168, an almost NIRCam-dark, millimetre-bright galaxy. The source was identified blindly in ALMA Band-4 continuum data and remains undetected in the COSMOS-Web DR1 NIRCam catalogue. We spectroscopically confirm a redshift of zspec = 6.631 from [C ii] 158 μm and four tentatively detected CO lines in NOEMA and ALMA data. SED fitting to near-IR to millimetre photometry yields $L_{\rm IR}=1.6^{+0.6}_{-0.4}\times 10^{12}\, L_\odot$, ${\rm SFR}=244^{+82}_{-55}\, M_\odot \, \rm yr^{-1}$, $M_\star =3.7^{+12.2}_{-2.6}\times 10^{10}\, M_\odot$ and AV = 5.4 ± 1.6 mag. From the millimetre continuum and [C ii] emission, we infer a warm ISM with Tdust = 60 ± 11K, $M_{\rm dust}=3.0^{+0.8}_{-0.5}\times 10^{8}\, M_\odot$ and Mgas = 4.1 ± 0.8 × 1010 M⊙. AC-2168 differs from normal UV-selected galaxies in its strong dust obscuration, yet its moderate SFR at high M⋆, consistent with the star-forming main sequence, distinguishes it from most blindly detected DSFGs dominated by intense starbursts. Its short depletion time of $\sim 170\, \rm Myr$, compact ($\sim 1\, \rm kpc$) dust-continuum size, and moderate SFR suggest a massive system caught in a rapid transition near the end of its main assembly phase, consistent with NIRSpec-based SFHs of massive quiescent galaxies at z ∼ 4 − 5. We also estimate a space density of $\rm 7.8^{+18.0}_{-6.5}\times 10^{-6}\, cMpc^{-3}$ for AC-2168-like NIRCam-dark galaxies at z ∼ 6 − 7, which reaches ∼42% of the abundance of massive quiescent galaxies at z ∼ 4 − 5. These results jointly suggest that NIRCam-dark galaxies are likely the direct progenitors of a substantial fraction of massive quiescent galaxies.
| Reference Key |
openalex_W4416234272
Use this key to autocite in the manuscript while using
SciMatic Manuscript Manager or Thesis Manager
|
|---|---|
| Authors | L. Bing, Seb Oliver, Mengyuan Xiao, G. Lagache, Sylvia Adscheid, Daizhong Liu, B. Magnelli, R. Neri, M. Dessauges‐Zavadsky, Anton M. Koekemoer, Maximilien Franco, Shuowen Jin, Olivia R. Cooper, Andreas L. Faisst, C. M. Casey, Jeyhan S. Kartaltepe, Hollis B. Akins, A. Beelen, David Elbaz, Steven Gillman, Santosh Harish, Arianna S. Long, H. J. McCracken, Pascal A. Oesch, Louise Paquereau, N. Ponthieu, Jason Rhodes, Brant Robertson, D. B. Sanders, Marko Shuntov, Stephen M. Wilkins |
| Journal | monthly notices of the royal astronomical society |
| Year | 2026 |
| DOI |
10.1093/mnras/stag846
|
| URL | |
| Keywords | Keywords not found |
Citations
No citations found. To add a citation, contact the admin at info@scimatic.org
Comments
No comments yet. Be the first to comment on this article.