TY - JOUR
T1 - Hidden Giants in JWST's PEARLS
T2 - An Ultramassive z = 4.26 Submillimeter Galaxy that Is Invisible to HST
AU - Smail, Ian
AU - Dudzevičiūtė, Ugnė
AU - Gurwell, Mark
AU - Fazio, Giovanni G.
AU - Willner, S. P.
AU - Swinbank, A. M.
AU - Arumugam, Vinodiran
AU - Summers, Jake
AU - Cohen, Seth H.
AU - Jansen, Rolf A.
AU - Windhorst, Rogier A.
AU - Meena, Ashish
AU - Zitrin, Adi
AU - Keel, William C.
AU - Cheng, Cheng
AU - Coe, Dan
AU - Conselice, Christopher J.
AU - D’Silva, Jordan C.J.
AU - Driver, Simon P.
AU - Frye, Brenda
AU - Grogin, Norman A.
AU - Koekemoer, Anton M.
AU - Marshall, Madeline A.
AU - Nonino, Mario
AU - Pirzkal, Nor
AU - Robotham, Aaron
AU - Rutkowski, Michael J.
AU - Ryan, Russell E.
AU - Tompkins, Scott
AU - Willmer, Christopher N.A.
AU - Yan, Haojing
AU - Broadhurst, Thomas J.
AU - Diego, José M.
AU - Kamieneski, Patrick
AU - Yun, Min
N1 - Publisher Copyright:
© 2023. The Author(s). Published by the American Astronomical Society.
PY - 2023/11/1
Y1 - 2023/11/1
N2 - We present a multiwavelength analysis using the Submillimeter Array (SMA), James Clerk Maxwell Telescope, NOEMA, JWST, the Hubble Space Telescope (HST), and the Spitzer Space Telescope of two dusty strongly star-forming galaxies, 850.1 and 850.2, seen through the massive cluster lens A 1489. These SMA-located sources both lie at z = 4.26 and have bright dust continuum emission, but 850.2 is a UV-detected Lyman-break galaxy, while 850.1 is undetected at ≲ 2 μm, even with deep JWST/NIRCam observations. We investigate their stellar, interstellar medium, and dynamical properties, including a pixel-level spectral energy distribution analysis to derive subkiloparsec-resolution stellar-mass and A V maps. We find that 850.1 is one of the most massive and highly obscured, A V ∼ 5, galaxies known at z > 4 with M * ∼1011.8 M ⊙ (likely forming at z > 6), and 850.2 is one of the least massive and least obscured, A V ∼ 1, members of the z > 4 dusty star-forming population. The diversity of these two dust-mass-selected galaxies illustrates the incompleteness of galaxy surveys at z ≳ 3-4 based on imaging at ≲ 2 μm, the longest wavelengths feasible from HST or the ground. The resolved mass map of 850.1 shows a compact stellar-mass distribution, R e mass ∼1 kpc, but its expected evolution means that it matches both the properties of massive, quiescent galaxies at z ∼ 1.5 and ultramassive early-type galaxies at z ∼ 0. We suggest that 850.1 is the central galaxy of a group in which 850.2 is a satellite that will likely merge in the near future. The stellar morphology of 850.1 shows arms and a linear bar feature that we link to the active dynamical environment it resides within.
AB - We present a multiwavelength analysis using the Submillimeter Array (SMA), James Clerk Maxwell Telescope, NOEMA, JWST, the Hubble Space Telescope (HST), and the Spitzer Space Telescope of two dusty strongly star-forming galaxies, 850.1 and 850.2, seen through the massive cluster lens A 1489. These SMA-located sources both lie at z = 4.26 and have bright dust continuum emission, but 850.2 is a UV-detected Lyman-break galaxy, while 850.1 is undetected at ≲ 2 μm, even with deep JWST/NIRCam observations. We investigate their stellar, interstellar medium, and dynamical properties, including a pixel-level spectral energy distribution analysis to derive subkiloparsec-resolution stellar-mass and A V maps. We find that 850.1 is one of the most massive and highly obscured, A V ∼ 5, galaxies known at z > 4 with M * ∼1011.8 M ⊙ (likely forming at z > 6), and 850.2 is one of the least massive and least obscured, A V ∼ 1, members of the z > 4 dusty star-forming population. The diversity of these two dust-mass-selected galaxies illustrates the incompleteness of galaxy surveys at z ≳ 3-4 based on imaging at ≲ 2 μm, the longest wavelengths feasible from HST or the ground. The resolved mass map of 850.1 shows a compact stellar-mass distribution, R e mass ∼1 kpc, but its expected evolution means that it matches both the properties of massive, quiescent galaxies at z ∼ 1.5 and ultramassive early-type galaxies at z ∼ 0. We suggest that 850.1 is the central galaxy of a group in which 850.2 is a satellite that will likely merge in the near future. The stellar morphology of 850.1 shows arms and a linear bar feature that we link to the active dynamical environment it resides within.
UR - http://www.scopus.com/inward/record.url?scp=85177484764&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85177484764&partnerID=8YFLogxK
U2 - 10.3847/1538-4357/acf931
DO - 10.3847/1538-4357/acf931
M3 - Article
AN - SCOPUS:85177484764
SN - 0004-637X
VL - 958
JO - Astrophysical Journal
JF - Astrophysical Journal
IS - 1
M1 - 36
ER -