Uncovering a Massive z∼7.7 Galaxy Hosting a Heavily Obscured Radio-loud Active Galactic Nucleus Candidate in COSMOS-Web

Erini Lambrides; Marco Chiaberge; Arianna S. Long; Daizhong Liu; Hollis B. Akins; Andrew F. Ptak; Irham Taufik Andika; Alessandro Capetti; Caitlin M. Casey; Jaclyn B. Champagne; Katherine Chworowsky; Tracy E. Clarke; Olivia R. Cooper; Xuheng Ding; Dillon Z. Dong; Andreas L. Faisst; Jordan Y. Forman; Maximilien Franco; Steven Gillman; Ghassem Gozaliasl; Kirsten R. Hall; Santosh Harish; Christopher C. Hayward; Michaela Hirschmann; Taylor A. Hutchison; Knud Jahnke; Shuowen Jin; Jeyhan S. Kartaltepe; Emma T. Kleiner; Anton M. Koekemoer; Vasily Kokorev; Sinclaire M. Manning; Crystal L. Martin; Jed McKinney; Colin Norman; Kristina Nyland; Masafusa Onoue; Brant E. Robertson; Marko Shuntov; John D. Silverman; Massimo Stiavelli; Benny Trakhtenbrot; Eleni Vardoulaki; Jorge A. Zavala; Natalie Allen; Olivier Ilbert; Henry Joy McCracken; Louise Paquereau; Jason Rhodes; Sune Toft

doi:10.3847/2041-8213/ad11ee

Uncovering a Massive z∼7.7 Galaxy Hosting a Heavily Obscured Radio-loud Active Galactic Nucleus Candidate in COSMOS-Web

Erini Lambrides^*
, Marco Chiaberge
, Arianna S. Long
, Daizhong Liu
, Hollis B. Akins
, Andrew F. Ptak
, Irham Taufik Andika
, Alessandro Capetti
, Caitlin M. Casey
, Jaclyn B. Champagne
, Katherine Chworowsky
, Tracy E. Clarke
, Olivia R. Cooper
, Xuheng Ding
, Dillon Z. Dong
, Andreas L. Faisst
, Jordan Y. Forman
, Maximilien Franco
, Steven Gillman
, Ghassem Gozaliasl

Kirsten R. Hall, Santosh Harish, Christopher C. Hayward, Michaela Hirschmann, Taylor A. Hutchison, Knud Jahnke, Shuowen Jin, Jeyhan S. Kartaltepe, Emma T. Kleiner, Anton M. Koekemoer, Vasily Kokorev, Sinclaire M. Manning, Crystal L. Martin, Jed McKinney, Colin Norman, Kristina Nyland, Masafusa Onoue, Brant E. Robertson, Marko Shuntov, John D. Silverman, Massimo Stiavelli, Benny Trakhtenbrot, Eleni Vardoulaki, Jorge A. Zavala, Natalie Allen, Olivier Ilbert, Henry Joy McCracken, Louise Paquereau, Jason Rhodes, Sune Toft

^*Corresponding author for this work

NASA Goddard Space Flight Center
Johns Hopkins University
University of Texas at Austin
Technical University of Munich
National Institute for Astrophysics
University of Arizona
Naval Research Laboratory
The University of Tokyo
National Radio Astronomy Observatory
California Institute of Technology
Aalto University
Harvard-Smithsonian Center for Astrophysics
Rochester Institute of Technology
Simons Foundation
Swiss Federal Institute of Technology Lausanne
Max Planck Institute for Astronomy
University of Groningen
University of Massachusetts
University of California at Santa Barbara
University of California at Santa Cruz
University of Copenhagen
Tel Aviv University
Karl Schwarzschild Observatory
National Institutes of Natural Sciences - National Astronomical Observatory of Japan
CNRS
Institut d’Astrophysique de Paris
Max Planck Institute for Astrophysics
Space Telescope Science Institute

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Abstract

In this Letter, we report the discovery of the highest redshift, heavily obscured, radio-loud (RL) active galactic nucleus (AGN) candidate selected using JWST NIRCam/MIRI, mid-IR, submillimeter, and radio imaging in the COSMOS-Web field. Using multifrequency radio observations and mid-IR photometry, we identify a powerful, RL, growing supermassive black hole with significant spectral steepening of the radio spectral energy distribution (f_{1.28 GHz} ∼ 2 mJy, q_{24 μm} = −1.1, α_{1.28−3 GHz} = − 1.2, Δα = − 0.4). In conjunction with ALMA, deep ground-based observations, ancillary space-based data, and the unprecedented resolution and sensitivity of JWST, we find no evidence of AGN contribution to the UV/optical/near-infrared (NIR) data and thus infer heavy amounts of obscuration (N_H > 10²³ cm⁻²). Using the wealth of deep UV to submillimeter photometric data, we report a singular solution photo-z of z_phot = 7.7_-⁺_0.3^0.4 and estimate an extremely massive host galaxy (log M_* = 11.92 0.5M) hosting a powerful, growing supermassive black hole (L_Bol = 4−12x × 10⁴⁶ erg s⁻¹). This source represents the farthest known obscured RL AGN candidate, and its level of obscuration aligns with the most representative but observationally scarce population of AGN at these epochs.

Original language	English
Article number	L25
Journal	Astrophysical Journal Letters
Volume	961
Issue number	1
Number of pages	9
ISSN	2041-8205
DOIs	https://doi.org/10.3847/2041-8213/ad11ee
Publication status	Published - 2024

Keywords

Active galactic nuclei (16)
High-redshift galaxies (734)
Radio loud quasars (1349)
Reionization (1383)
Supermassive black holes (1663)
Unified Astronomy Thesaurus concepts: Quasars (1319)

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Lambrides, E., Chiaberge, M., Long, A. S., Liu, D., Akins, H. B., Ptak, A. F., Andika, I. T., Capetti, A., Casey, C. M., Champagne, J. B., Chworowsky, K., Clarke, T. E., Cooper, O. R., Ding, X., Dong, D. Z., Faisst, A. L., Forman, J. Y., Franco, M., Gillman, S., ... Toft, S. (2024). Uncovering a Massive z∼7.7 Galaxy Hosting a Heavily Obscured Radio-loud Active Galactic Nucleus Candidate in COSMOS-Web. Astrophysical Journal Letters, 961(1), Article L25. https://doi.org/10.3847/2041-8213/ad11ee

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title = "Uncovering a Massive z∼7.7 Galaxy Hosting a Heavily Obscured Radio-loud Active Galactic Nucleus Candidate in COSMOS-Web",

abstract = "In this Letter, we report the discovery of the highest redshift, heavily obscured, radio-loud (RL) active galactic nucleus (AGN) candidate selected using JWST NIRCam/MIRI, mid-IR, submillimeter, and radio imaging in the COSMOS-Web field. Using multifrequency radio observations and mid-IR photometry, we identify a powerful, RL, growing supermassive black hole with significant spectral steepening of the radio spectral energy distribution (f1.28 GHz ∼ 2 mJy, q24 μm = −1.1, α1.28−3 GHz = − 1.2, Δα = − 0.4). In conjunction with ALMA, deep ground-based observations, ancillary space-based data, and the unprecedented resolution and sensitivity of JWST, we find no evidence of AGN contribution to the UV/optical/near-infrared (NIR) data and thus infer heavy amounts of obscuration (NH > 1023 cm−2). Using the wealth of deep UV to submillimeter photometric data, we report a singular solution photo-z of zphot = 7.7-+0.30.4 and estimate an extremely massive host galaxy (log M* = 11.92 0.5M) hosting a powerful, growing supermassive black hole (LBol = 4−12x × 1046 erg s−1). This source represents the farthest known obscured RL AGN candidate, and its level of obscuration aligns with the most representative but observationally scarce population of AGN at these epochs.",

keywords = "Active galactic nuclei (16), High-redshift galaxies (734), Radio loud quasars (1349), Reionization (1383), Supermassive black holes (1663), Unified Astronomy Thesaurus concepts: Quasars (1319)",

author = "Erini Lambrides and Marco Chiaberge and Long, \{Arianna S.\} and Daizhong Liu and Akins, \{Hollis B.\} and Ptak, \{Andrew F.\} and Andika, \{Irham Taufik\} and Alessandro Capetti and Casey, \{Caitlin M.\} and Champagne, \{Jaclyn B.\} and Katherine Chworowsky and Clarke, \{Tracy E.\} and Cooper, \{Olivia R.\} and Xuheng Ding and Dong, \{Dillon Z.\} and Faisst, \{Andreas L.\} and Forman, \{Jordan Y.\} and Maximilien Franco and Steven Gillman and Ghassem Gozaliasl and Hall, \{Kirsten R.\} and Santosh Harish and Hayward, \{Christopher C.\} and Michaela Hirschmann and Hutchison, \{Taylor A.\} and Knud Jahnke and Shuowen Jin and Kartaltepe, \{Jeyhan S.\} and Kleiner, \{Emma T.\} and Koekemoer, \{Anton M.\} and Vasily Kokorev and Manning, \{Sinclaire M.\} and Martin, \{Crystal L.\} and Jed McKinney and Colin Norman and Kristina Nyland and Masafusa Onoue and Robertson, \{Brant E.\} and Marko Shuntov and Silverman, \{John D.\} and Massimo Stiavelli and Benny Trakhtenbrot and Eleni Vardoulaki and Zavala, \{Jorge A.\} and Natalie Allen and Olivier Ilbert and McCracken, \{Henry Joy\} and Louise Paquereau and Jason Rhodes and Sune Toft",

year = "2024",

doi = "10.3847/2041-8213/ad11ee",

language = "English",

volume = "961",

journal = "Astrophysical Journal Letters",

issn = "2041-8205",

publisher = "American Astronomical Society",

number = "1",

}

Lambrides, E, Chiaberge, M, Long, AS, Liu, D, Akins, HB, Ptak, AF, Andika, IT, Capetti, A, Casey, CM, Champagne, JB, Chworowsky, K, Clarke, TE, Cooper, OR, Ding, X, Dong, DZ, Faisst, AL, Forman, JY, Franco, M, Gillman, S, Gozaliasl, G, Hall, KR, Harish, S, Hayward, CC, Hirschmann, M, Hutchison, TA, Jahnke, K, Jin, S, Kartaltepe, JS, Kleiner, ET, Koekemoer, AM, Kokorev, V, Manning, SM, Martin, CL, McKinney, J, Norman, C, Nyland, K, Onoue, M, Robertson, BE, Shuntov, M, Silverman, JD, Stiavelli, M, Trakhtenbrot, B, Vardoulaki, E, Zavala, JA, Allen, N, Ilbert, O, McCracken, HJ, Paquereau, L, Rhodes, J & Toft, S 2024, 'Uncovering a Massive z∼7.7 Galaxy Hosting a Heavily Obscured Radio-loud Active Galactic Nucleus Candidate in COSMOS-Web', Astrophysical Journal Letters, vol. 961, no. 1, L25. https://doi.org/10.3847/2041-8213/ad11ee

TY - JOUR

T1 - Uncovering a Massive z∼7.7 Galaxy Hosting a Heavily Obscured Radio-loud Active Galactic Nucleus Candidate in COSMOS-Web

AU - Lambrides, Erini

AU - Chiaberge, Marco

AU - Long, Arianna S.

AU - Liu, Daizhong

AU - Akins, Hollis B.

AU - Ptak, Andrew F.

AU - Andika, Irham Taufik

AU - Capetti, Alessandro

AU - Casey, Caitlin M.

AU - Champagne, Jaclyn B.

AU - Chworowsky, Katherine

AU - Clarke, Tracy E.

AU - Cooper, Olivia R.

AU - Ding, Xuheng

AU - Dong, Dillon Z.

AU - Faisst, Andreas L.

AU - Forman, Jordan Y.

AU - Franco, Maximilien

AU - Gillman, Steven

AU - Gozaliasl, Ghassem

AU - Hall, Kirsten R.

AU - Harish, Santosh

AU - Hayward, Christopher C.

AU - Hirschmann, Michaela

AU - Hutchison, Taylor A.

AU - Jahnke, Knud

AU - Jin, Shuowen

AU - Kartaltepe, Jeyhan S.

AU - Kleiner, Emma T.

AU - Koekemoer, Anton M.

AU - Kokorev, Vasily

AU - Manning, Sinclaire M.

AU - Martin, Crystal L.

AU - McKinney, Jed

AU - Norman, Colin

AU - Nyland, Kristina

AU - Onoue, Masafusa

AU - Robertson, Brant E.

AU - Shuntov, Marko

AU - Silverman, John D.

AU - Stiavelli, Massimo

AU - Trakhtenbrot, Benny

AU - Vardoulaki, Eleni

AU - Zavala, Jorge A.

AU - Allen, Natalie

AU - Ilbert, Olivier

AU - McCracken, Henry Joy

AU - Paquereau, Louise

AU - Rhodes, Jason

AU - Toft, Sune

PY - 2024

Y1 - 2024

N2 - In this Letter, we report the discovery of the highest redshift, heavily obscured, radio-loud (RL) active galactic nucleus (AGN) candidate selected using JWST NIRCam/MIRI, mid-IR, submillimeter, and radio imaging in the COSMOS-Web field. Using multifrequency radio observations and mid-IR photometry, we identify a powerful, RL, growing supermassive black hole with significant spectral steepening of the radio spectral energy distribution (f1.28 GHz ∼ 2 mJy, q24 μm = −1.1, α1.28−3 GHz = − 1.2, Δα = − 0.4). In conjunction with ALMA, deep ground-based observations, ancillary space-based data, and the unprecedented resolution and sensitivity of JWST, we find no evidence of AGN contribution to the UV/optical/near-infrared (NIR) data and thus infer heavy amounts of obscuration (NH > 1023 cm−2). Using the wealth of deep UV to submillimeter photometric data, we report a singular solution photo-z of zphot = 7.7-+0.30.4 and estimate an extremely massive host galaxy (log M* = 11.92 0.5M) hosting a powerful, growing supermassive black hole (LBol = 4−12x × 1046 erg s−1). This source represents the farthest known obscured RL AGN candidate, and its level of obscuration aligns with the most representative but observationally scarce population of AGN at these epochs.

AB - In this Letter, we report the discovery of the highest redshift, heavily obscured, radio-loud (RL) active galactic nucleus (AGN) candidate selected using JWST NIRCam/MIRI, mid-IR, submillimeter, and radio imaging in the COSMOS-Web field. Using multifrequency radio observations and mid-IR photometry, we identify a powerful, RL, growing supermassive black hole with significant spectral steepening of the radio spectral energy distribution (f1.28 GHz ∼ 2 mJy, q24 μm = −1.1, α1.28−3 GHz = − 1.2, Δα = − 0.4). In conjunction with ALMA, deep ground-based observations, ancillary space-based data, and the unprecedented resolution and sensitivity of JWST, we find no evidence of AGN contribution to the UV/optical/near-infrared (NIR) data and thus infer heavy amounts of obscuration (NH > 1023 cm−2). Using the wealth of deep UV to submillimeter photometric data, we report a singular solution photo-z of zphot = 7.7-+0.30.4 and estimate an extremely massive host galaxy (log M* = 11.92 0.5M) hosting a powerful, growing supermassive black hole (LBol = 4−12x × 1046 erg s−1). This source represents the farthest known obscured RL AGN candidate, and its level of obscuration aligns with the most representative but observationally scarce population of AGN at these epochs.

KW - Active galactic nuclei (16)

KW - High-redshift galaxies (734)

KW - Radio loud quasars (1349)

KW - Reionization (1383)

KW - Supermassive black holes (1663)

KW - Unified Astronomy Thesaurus concepts: Quasars (1319)

U2 - 10.3847/2041-8213/ad11ee

DO - 10.3847/2041-8213/ad11ee

M3 - Journal article

AN - SCOPUS:85184272274

SN - 2041-8205

VL - 961

JO - Astrophysical Journal Letters

JF - Astrophysical Journal Letters

IS - 1

M1 - L25

ER -

Uncovering a Massive z∼7.7 Galaxy Hosting a Heavily Obscured Radio-loud Active Galactic Nucleus Candidate in COSMOS-Web

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