2025ApJ...983...55K

Query : 2025ApJ...983...55K

2025ApJ...983...55K - Astrophys. J., 983, 55 (2025/April-2)

JWST Spectroscopic View of a Rapidly Growing, Dust-obscured Quasar at z ∼ 4: Effect of Dust Extinction Correction on Black Hole Mass and Eddington Ratio Estimation.

KIM D. and IM M.

Abstract (from CDS):

In the merger-driven galaxy evolution scenario, the central supermassive black holes (SMBHs) in dust-obscured galaxies grow rapidly. Interestingly, a recent work on a dust-obscured galaxy, LID-568 at z = 3.965, has shown that its SMBH is growing extremely fast at about 40 times the Eddington-limited accretion rate (i.e., super-Eddington accretion). However, the heavy dust extinction of the host galaxy could affect the result if not corrected properly. Here, we analyze James Webb Space Telescope (JWST) NIRSpec integral field unit (IFU) and MIRI spectra of LID-568. By measuring its bolometric luminosity (Lbol) and black hole (BH) mass (MBH) using an extinction-free estimator based on mid-infrared spectra, we obtain Lbol = 1046.83±0.07 erg s–1 and MBH = 108.43±0.15M⊙. The measured Eddington ratio (λEdd) is 1.97 ± 0.88, consistent with the accretion rate at the Eddington limit; in other words, it is not super-Eddington in a significant manner. This result underscores challenges and the importance of carefully considering dust extinction when analyzing the BH growth in dust-obscured quasars.

Abstract Copyright: © 2025. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): Galaxy evolution - Early universe - Supermassive black holes - Quasars - James Webb Space Telescope - Infrared astronomy

Simbad objects: 1

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Number of rows : 1
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 943473 AGN 09 58 44.116 +02 44 06.57           ~ 6 0

Query : 2025ApJ...983...55K

Basic data :
COSMOS2015 943473 -- Active Galaxy Nucleus
Other object types: otypes_help 		AGN (2019ApJ), G (2016ApJ), X ([CMC2016])
ICRS coord. (ep=J2000) : 		09 58 44.116 +02 44 06.57 (Optical) [ ] C 2016ApJ...817...34M
FK4 coord. (ep=B1950 eq=1950) : 		09 56 08.674 +02 58 28.85 [ ]
Gal coord. (ep=J2000) : 		235.901463 +42.071077 [ ]
Radial velocity / Redshift / cz : 		V(km/s) 276418 [~] / z(spectroscopic) 3.965 [~] / cz 1188677 [~]
   (NIR) D 2025NatAs...9..271S
Fluxes (1) :
i (AB) 26.50 [0.27] C 2016ApJ...817...34M
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Identifiers (2) :
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COSMOS2015 943473 [CMC2016] lid 568

References (6 between 1850 and 2026) (Total 6)
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