Birds of a Feather: Resolving Stellar Mass Assembly with JWST/NIRCam in a Pair of Kindred z ∼ 2 Dusty Star-forming Galaxies Lensed by the PLCK G165.7+67.0 Cluster
Abstract We present a new parametric lens model for the G165.7+67.0 galaxy cluster, which was discovered with Planck through its bright submillimeter flux, originating from a pair of extraordinary dusty star-forming galaxies (DSFGs) at z ≈ 2.2. Using JWST and interferometric mm/radio observations, we characterize the intrinsic physical properties of the DSFGs, which are separated by only ∼1″ (8 kpc) and a velocity difference Δ V ≲ 600 km s −1 in the source plane, and thus are likely undergoing a major merger. Boasting intrinsic star formation rates SFR IR = 320 ± 70 and 400 ± 80 M ⊙ yr −1 , stellar masses of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mi>log</mml:mi> <mml:mo stretchy="false">[</mml:mo> <mml:msub> <mml:mrow> <mml:mi>M</mml:mi> </mml:mrow> <mml:mrow> <mml:mo>⋆</mml:mo> </mml:mrow> </mml:msub> <mml:mrow> <mml:mo stretchy="true">/</mml:mo> </mml:mrow> <mml:msub> <mml:mrow> <mml:mi>M</mml:mi> </mml:mrow> <mml:mrow> <mml:mo>⊙</mml:mo> </mml:mrow> </mml:msub> <mml:mo stretchy="false">]</mml:mo> <mml:mo>=</mml:mo> <mml:mn>10.2</mml:mn> <mml:mo>±</mml:mo> <mml:mn>0.1</mml:mn> </mml:math> and 10.3 ± 0.1, and dust attenuations of A V = 1.5 ± 0.3 and 1.2 ± 0.3, they are remarkably similar objects. We perform spatially resolved pixel-by-pixel spectral energy distribution (SED) fitting using rest-frame near-UV to near-IR imaging from JWST/NIRCam for both galaxies, resolving some stellar structures down to 100 pc scales. Based on their resolved specific star formation rates (SFRs) and UVJ colors, both DSFGs are experiencing significant galaxy-scale star formation events. If they are indeed interacting gravitationally, this strong starburst could be the hallmark of gas that has been disrupted by an initial close passage. In contrast, the host galaxy of SN H0pe has a much lower SFR than the DSFGs, and we present evidence for the onset of inside-out quenching and large column densities of dust even in regions of low specific SFR. Based on the intrinsic SFRs of the DSFGs inferred from UV through far-infrared SED modeling, this pair of objects alone is predicted to yield an observable 1.1 ± 0.2 core-collapse supernovae per year, making this cluster field ripe for continued monitoring.
Authors
- Jake Summers (ORCID: https://orcid.org/0000-0002-7265-7920)
- Massimo Pascale (ORCID: https://orcid.org/0000-0002-2282-8795)
- Kevin C. Harrington (ORCID: https://orcid.org/0000-0001-5429-5762)
- Rogier A. Windhorst (ORCID: https://orcid.org/0000-0001-8156-6281)
- Rolf A. Jansen (ORCID: https://orcid.org/0000-0003-1268-5230)
- Allison Noble (ORCID: https://orcid.org/0000-0003-1832-4137)
- Norman A. Grogin (ORCID: https://orcid.org/0000-0001-9440-8872)
- Patrick S. Kamieneski (ORCID: https://orcid.org/0000-0001-9394-6732)
- Russell E. Ryan (ORCID: https://orcid.org/0000-0003-0894-1588)
- Nikhil Garuda (ORCID: https://orcid.org/0000-0003-3418-2482)
- Timothy Carleton (ORCID: https://orcid.org/0000-0001-6650-2853)
- Madeline A. Marshall (ORCID: https://orcid.org/0000-0001-6434-7845)
- Min S. Yun (ORCID: https://orcid.org/0000-0001-7095-7543)
- Christopher J. Conselice (ORCID: https://orcid.org/0000-0003-1949-7638)
- Seth H. Cohen (ORCID: https://orcid.org/0000-0003-3329-1337)
- Anton M. Koekemoer (ORCID: https://orcid.org/0000-0002-6610-2048)
- Reagen Leimbach (ORCID: https://orcid.org/0009-0001-7446-2350)
- Dan Coe (ORCID: https://orcid.org/0000-0001-7410-7669)
- Jordan C. J. D’Silva (ORCID: https://orcid.org/0000-0002-9816-1931)
- Belén Alcalde Pampliega (ORCID: https://orcid.org/0000-0002-4140-0428)
- Simon P. Driver (ORCID: https://orcid.org/0000-0001-9491-7327)
- Amit Vishwas (ORCID: https://orcid.org/0000-0002-4444-8929)
- Nicholas Foo (ORCID: https://orcid.org/0000-0002-7460-8460)
- S. P. Willner (ORCID: https://orcid.org/0000-0002-9895-5758)
- Benne W. Holwerda (ORCID: https://orcid.org/0000-0002-4884-6756)
- Eric F. Jiménez-Andrade (ORCID: https://orcid.org/0000-0002-2640-5917)
- Haojing Yan (ORCID: https://orcid.org/0000-0001-7592-7714)
- Alex Pigarelli (ORCID: https://orcid.org/0000-0001-9369-6921)
- Brenda Frye (ORCID: https://orcid.org/0000-0003-1625-8009)
- Q. Daniel Wang (ORCID: https://orcid.org/0000-0002-9279-4041)
- Cheng Cheng (ORCID: https://orcid.org/0000-0003-0202-0534)
- Nor Pirzkal (ORCID: https://orcid.org/0000-0003-3382-5941)
- M. Polletta (ORCID: https://orcid.org/0000-0001-7411-5386)
- Christopher N. A. Willmer (ORCID: https://orcid.org/0000-0001-9262-9997)
- William C. Keel (ORCID: https://orcid.org/0000-0002-6131-9539)
- James D. Lowenthal (ORCID: https://orcid.org/0000-0001-9969-3115)
- M. Nonino (ORCID: https://orcid.org/0000-0001-6342-9662)
- Justin D. R. Pierel (ORCID: https://orcid.org/0000-0002-2361-7201)
- A. S. G. Robotham (ORCID: https://orcid.org/0000-0003-0429-3579)
- Tyler R. Hinrichs (ORCID: https://orcid.org/0009-0008-0376-3771)
- Rafael Ortiz (ORCID: https://orcid.org/0000-0002-6150-833X)
Publication Details
- Journal
- The Astrophysical Journal
- Published
- 2024-09-01
- DOI
- https://doi.org/10.3847/1538-4357/ad5d59
- Citations
- 6
- Primary Topic
- Gamma-ray bursts and supernovae
- Type
- article
- Field-Weighted Citation Impact
- 1.99
Funders
- National Science Foundation
- National Aeronautics and Space Administration
- Aspen Center for Physics
- Space Telescope Science Institute
- National Natural Science Foundation of China
- Consejo Nacional de Ciencia y Tecnología
- Science and Technology Facilities Council
- Astrophysics Science Division