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. Kartaltepe; Daizhong Liu; Louise Paquereau; Jason Rhodes; Michael R. Rich; Brant Robertson; Sune Toft; Ghassem Gozaliasl

doi:10.48550/arXiv.2408.10305

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. Kartaltepe

Daizhong Liu, Louise Paquereau, Jason Rhodes, Michael R. Rich, Brant Robertson, Sune Toft, Ghassem Gozaliasl

^*Corresponding author for this work

University of Bologna
University of Texas at Austin
Northeastern University
University of Hawaii
Space Telescope Science Institute
University of Groningen
University of Copenhagen
National Institute for Astrophysics
Rochester Institute of Technology
Aix-Marseille Université
Sorbonne Université
Chinese Academy of Sciences
California Institute of Technology
University of California at Los Angeles
University of California at Santa Cruz
Aalto University

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Abstract

We present the properties of two candidate massive (M_⋆ ∼ 10¹¹M_⊙) and dusty (A_v > 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 z_spec = 5.051, while the other has a robust z_phot = 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 language	English
Article number	L2
Journal	The Astrophysical Journal Letters
Volume	973
Number of pages	8
ISSN	2041-8205
DOIs	https://doi.org/10.48550/arXiv.2408.10305
Publication status	Published - 2024

Keywords

Galaxy evolution
Galaxy formation
High-redshift galaxies
Star formation
Galaxies

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Gentile, F., Casey, C. M., Akins, H. B., Franco, M., Mckinney, J., Berman, E., Cooper, O. R., Drakos, N. E., Hirschmann, M., Long, A. S., Magdis, G., Koekemoer, A. M., Kokorev, V., Shuntov, M., Talia, M., Allen, N., Harish, S., Ilbert, O., Mccracken, H. J., ... Gozaliasl, G. (2024). 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. The Astrophysical Journal Letters, 973, Article L2. https://doi.org/10.48550/arXiv.2408.10305

@article{b2923f5a76754008a4d94c25e51dd5ac,

title = "Not-so-little red dots: two massive and dusty starbursts at z\textasciitilde{}5-7 pushing the limits of star formation discovered by JWST in the COSMOS-web survey",

abstract = " We present the properties of two candidate massive (M⋆ ∼ 1011M⊙) and dusty (Av > 2.5 mag) galaxies at z = 5{\textendash}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{\textendash}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.",

keywords = "Galaxy evolution, Galaxy formation, High-redshift galaxies, Star formation, Galaxies",

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

year = "2024",

doi = "10.48550/arXiv.2408.10305",

language = "English",

volume = "973",

journal = "The Astrophysical Journal Letters",

issn = "2041-8205",

publisher = "American Astronomical Society",

}

Gentile, F, Casey, CM, Akins, HB, Franco, M, Mckinney, J, Berman, E, Cooper, OR, Drakos, NE, Hirschmann, M, Long, AS, Magdis, G, Koekemoer, AM, Kokorev, V, Shuntov, M, Talia, M, Allen, N, Harish, S, Ilbert, O, Mccracken, HJ, Kartaltepe, JS, Liu, D, Paquereau, L, Rhodes, J, Rich, MR, Robertson, B, Toft, S & Gozaliasl, G 2024, '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', The Astrophysical Journal Letters, vol. 973, L2. https://doi.org/10.48550/arXiv.2408.10305

TY - JOUR

T1 - 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

AU - Gentile, Fabrizio

AU - Casey, Caitlin M.

AU - Akins, Hollis B.

AU - Franco, Maximilien

AU - Mckinney, Jed

AU - Berman, Edward

AU - Cooper, Olivia R.

AU - Drakos, Nicole E.

AU - Hirschmann, Michaela

AU - Long, Arianna S.

AU - Magdis, Georgios

AU - Koekemoer, Anton M.

AU - Kokorev, Vasily

AU - Shuntov, Marko

AU - Talia, Margherita

AU - Allen, Natalie

AU - Harish, Santosh

AU - Ilbert, Olivier

AU - Mccracken, Henry J.

AU - Kartaltepe, Jeyhan S.

AU - Liu, Daizhong

AU - Paquereau, Louise

AU - Rhodes, Jason

AU - Rich, Michael R.

AU - Robertson, Brant

AU - Toft, Sune

AU - Gozaliasl, Ghassem

PY - 2024

Y1 - 2024

N2 - 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.

AB - 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.

KW - Galaxy evolution

KW - Galaxy formation

KW - High-redshift galaxies

KW - Star formation

KW - Galaxies

U2 - 10.48550/arXiv.2408.10305

DO - 10.48550/arXiv.2408.10305

M3 - Journal article

SN - 2041-8205

VL - 973

JO - The Astrophysical Journal Letters

JF - The Astrophysical Journal Letters

M1 - L2

ER -

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

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Keywords

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