2024ApJ...961L..25L

Query : 2024ApJ...961L..25L

2024ApJ...961L..25L - Astrophys. J., 961, L25 (2024/January-3)

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

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., GOZALIASL G., HALL K.R., HARISH S., HAYWARD C.C., HIRSCHMANN M., HUTCHISON T.A., JAHNKE K., JIN S., KARTALTEPE J.S., KLEINER E.T., KOEKEMOER A.M., KOKOREV V., MANNING S.M., MARTIN C.L., McKINNEY J., NORMAN C., NYLAND K., ONOUE M., ROBERTSON B.E., SHUNTOV M., SILVERMAN J.D., STIAVELLI M., TRAKHTENBROT B., VARDOULAKI E., ZAVALA J.A., ALLEN N., ILBERT O., McCRACKEN H.J., PAQUEREAU L., RHODES J. and TOFT S.

Abstract (from CDS):

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 (NH > 1023 cm–2). Using the wealth of deep UV to submillimeter photometric data, we report a singular solution photo-z of zphot = ${7.7}_{-0.3}^{+0.4}$ and estimate an extremely massive host galaxy $(\mathrm{log}{M}_{\star }=11.92\pm 0.5{M}_{\odot })$ 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.

Abstract Copyright: © 2024. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): Quasars - Radio loud quasars - Active galactic nuclei - Supermassive black holes - Reionization - High-redshift galaxies

Simbad objects: 3

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Number of rows : 3
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 COSMOS2015 245166 G 09 58 58.270 +01 39 20.19           ~ 13 0
2 NAME COSMOS Field reg 10 00 28.60 +02 12 21.0           ~ 3639 0
3 COSMOSVLA J100104.51+020203.6 rG 10 01 04.519 +02 02 03.65           ~ 9 0

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