Not-so-little red dots: two massive and dusty starbursts at z~5-7 pushing the limits of star formation discovered by JWST in the COSMOS-web survey

Fabrizio Gentile*, Caitlin M. Casey, Hollis B. Akins, Maximilien Franco, Jed Mckinney, Edward Berman, Olivia R. Cooper, Nicole E. Drakos, Michaela Hirschmann, Arianna S. Long, Georgios Magdis, Anton M. Koekemoer, Vasily Kokorev, Marko Shuntov, Margherita Talia, Natalie Allen, Santosh Harish, Olivier Ilbert, Henry J. Mccracken, Jeyhan S. KartaltepeDaizhong Liu, Louise Paquereau, Jason Rhodes, Michael R. Rich, Brant Robertson, Sune Toft, Ghassem Gozaliasl

*Corresponding author for this work

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Abstract


We present the properties of two candidate massive (M ∼ 1011M) and dusty (Av > 2.5 mag) galaxies at z = 5–7 in the first 0.28 deg2 of the COSMOS-Web survey. One object is spectroscopically confirmed at zspec = 5.051, while the other has a robust zphot = 6.7 ± 0.3. Thanks to their extremely red colors (F277W–F444W ∼ 1.7 mag), these galaxies satisfy the nominal color selection for the widely studied "little red dot" (LRD) population with the exception of their spatially resolved morphologies. The morphology of our targets allows us to conclude that their red continuum is dominated by highly obscured stellar emission and not by reddened nuclear activity.
Original languageEnglish
Article numberL2
JournalThe Astrophysical Journal Letters
Volume973
Number of pages8
ISSN2041-8205
DOIs
Publication statusPublished - 2024

Keywords

  • Galaxy evolution
  • Galaxy formation
  • High-redshift galaxies
  • Star formation
  • Galaxies

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