TY - JOUR
T1 - Detection of the Low-stellar-mass Host Galaxy of a z ∼ 6.25 Quasar with JWST
AU - Stone, Meredith A.
AU - Lyu, Jianwei
AU - Rieke, George H
AU - Alberts, Stacey
N1 - Funding Information:
We thank Tod Lauer for important discussions regarding selection biases and Feige Wang, Jinyi Yang, and Xiaohui Fan for their insightful comments. The anonymous referee’s feedback also greatly improved this work. M.S., S.A., J.L., and G.R. acknowledge support from the JWST Mid-Infrared Instrument (MIRI) grant No. 80NSSC18K0555, and the NIRCam science support contract NAS5-02105, both from NASA Goddard Space Flight Center to the University of Arizona. The JWST data presented in this paper were obtained from the Mikulski Archive for Space Telescopes (MAST) at the Space Telescope Science Institute. The specific observations analyzed can be accessed via DOI: 10.17909/ajqw-7w52 .
Funding Information:
We thank Tod Lauer for important discussions regarding selection biases and Feige Wang, Jinyi Yang, and Xiaohui Fan for their insightful comments. The anonymous referee’s feedback also greatly improved this work. M.S., S.A., J.L., and G.R. acknowledge support from the JWST Mid-Infrared Instrument (MIRI) grant No. 80NSSC18K0555, and the NIRCam science support contract NAS5-02105, both from NASA Goddard Space Flight Center to the University of Arizona. The JWST data presented in this paper were obtained from the Mikulski Archive for Space Telescopes (MAST) at the Space Telescope Science Institute. The specific observations analyzed can be accessed via DOI:10.17909/ajqw-7w52.
Publisher Copyright:
© 2023. The Author(s). Published by the American Astronomical Society.
PY - 2023/8/1
Y1 - 2023/8/1
N2 - We characterize the stellar mass of J2239+0207, a z ∼ 6.25 sub-Eddington quasar (M 1450 = −24.6), using dedicated JWST/NIRCam medium-band observations of a nearby point-spread function star to remove the central point source and reveal the underlying galaxy emission. We detect the host galaxy in two bands longward of the Balmer break, obtaining a stellar mass of ∼1010 M ⊙, more than an order of magnitude less than this quasar’s existing measured [C ii] dynamical mass. We additionally calculate the mass of J2239+0207's central supermassive black hole using JWST/NIRSpec integral field unit observations, and determine that the black hole is ∼15 times more massive than predicted by the local M BH-M * relation, similar to many high-redshift quasars with dynamical masses determined via millimeter-wave line widths. We carefully consider potential selection effects at play, and find that even when z ∼ 6 quasars are compared to a local sample with similarly determined dynamical masses, many of the high-redshift quasars appear to possess overmassive black holes. We conclude z ∼ 6 quasars are likely to have a larger spread about the M BH-M * relation than observed in the local Universe.
AB - We characterize the stellar mass of J2239+0207, a z ∼ 6.25 sub-Eddington quasar (M 1450 = −24.6), using dedicated JWST/NIRCam medium-band observations of a nearby point-spread function star to remove the central point source and reveal the underlying galaxy emission. We detect the host galaxy in two bands longward of the Balmer break, obtaining a stellar mass of ∼1010 M ⊙, more than an order of magnitude less than this quasar’s existing measured [C ii] dynamical mass. We additionally calculate the mass of J2239+0207's central supermassive black hole using JWST/NIRSpec integral field unit observations, and determine that the black hole is ∼15 times more massive than predicted by the local M BH-M * relation, similar to many high-redshift quasars with dynamical masses determined via millimeter-wave line widths. We carefully consider potential selection effects at play, and find that even when z ∼ 6 quasars are compared to a local sample with similarly determined dynamical masses, many of the high-redshift quasars appear to possess overmassive black holes. We conclude z ∼ 6 quasars are likely to have a larger spread about the M BH-M * relation than observed in the local Universe.
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U2 - 10.3847/1538-4357/acebe0
DO - 10.3847/1538-4357/acebe0
M3 - Article
AN - SCOPUS:85168606341
SN - 0004-637X
VL - 953
JO - Astrophysical Journal
JF - Astrophysical Journal
IS - 2
M1 - 180
ER -