Resolving Quiescent Galaxies at z ≳ 2. I. Search for Gravitationally Lensed Sources and Characterization of Their Structure, Stellar Populations, and Line Emission
Open accessAbstract
Quiescent galaxies at z ≳ 2 are compact and have weak or absent emission lines, making it difficult to spatially resolve their kinematics and stellar populations using ground-based spectroscopy. Gravitationally lensed examples provide a promising route forward, but such objects are very rare. We describe a search in the fields of 232 galaxy clusters that has uncovered five bright (H AB < 20) lensed galaxies with red near-infrared colors. These include MRG-M0138, which is the brightest lensed galaxy known in the near-infrared. Analysis of near-infrared spectra and multiband photometry confirms that all are quiescent galaxies at z = 1.95–2.64 with stellar ages of 0.5–1.4 Gyr (corresponding to formation epochs z form ≃ 3–4) and stellar masses of , where μ is the magnification. In three cases, we derive lens models and reconstruct the source structure; these galaxies are massive ( ) and follow the mass–size relation defined by unlensed samples. In two of these three galaxies, the main structural component is an inclined disk. Weak emission lines are detected in four of five galaxies with high ratios [N ii]/H α ≃ 2–6 that are inconsistent with a star formation origin. Based on the line ratios, the H α equivalent widths, and the distribution and kinematics of the gas, we infer that shocks are likely to be present in at least two galaxies and could be present in all of the line emitters. We speculate that these could be analogs of local galaxies in which AGN jet-driven outflows are thought to heat the interstellar medium and suppress star formation. In further papers, we will present spatially resolved measurements of the stellar populations and kinematics of this unique sample.
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The primary lensed source of MACSJ0138 is a quiescent galaxy at z = 1.95 known as MRG-0138.
“whose primary source is a quiescent galaxy at z=1.95 known as MRG-0138 Newman et al. [30].”
From Constraint on dark matter self-interaction from combined strong lensing and stellar kinematics in MACS J0138-2155 (2026) · cites this paper as Newman et al. [30]
Acebron et al. [38] noted that their predicted magnifications strongly disagree with previously reported lens models in [30, 31].
“Acebron et al. [38] similarly noted that their predicted magnifications strongly disagree with previously reported lens models in [30, 31].”
From Constraint on dark matter self-interaction from combined strong lensing and stellar kinematics in MACS J0138-2155 (2026) · cites this paper as [30]
Section 5.1.2, “Magnification Uncertainties” (page unavailable), reports differences between Newman et al.’s own lens models, but does not address Acebron et al.’s predictions or their comparison with the previously reported models in [30, 31]. Searches for Acebron and for disagreement with previous lens models found no passage establishing the attributed statement. (LLM, conf=0.76)
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Sorted by citations
O’Donnell, J. H., Jeltema, T. E., Roberts, M. G., Nightingale, J., Flowers, A., & Aldas, D. (2026) · Physical Review D · doi:10.1103/hfgd-245k · Cited by 5 · see citing works
- Authors
- Newman, A. B., Belli, S., Ellis, R. S., & Patel, S. G.
- Affiliations
- Carnegie Institution for Science (US)
- Max Planck Institute for Extraterrestrial Physics (DE)
- European Southern Observatory (DE)
- Corresponding author
- Newman, Andrew B.
- Venue
- The Astrophysical Journal
- Publisher
- American Astronomical Society
- Published
- 2018-07-31
- Volume
- 862
- Issue
- 2
- Pages
- 125
- ISSN
- 0004-637X (ISSN-L)
- 1538-4357
- OpenAlex
- W2808201186
- Cited by
- 60
- References
- 0
- Citations by year
- 2026: 7 · 2025: 6 · 2024: 10 · 2023: 5 · 2022: 5 · 2021: 10 · 2020: 10 · 2019: 6 · 2018: 1
- FWCI
- 3.54
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Licence
- Locations
- The Astrophysical Journal (publishedVersion)
- arXiv (Cornell University) (submittedVersion)
- Archivio istituzionale della ricerca (Alma Mater Studiorum Università di Bologna) (submittedVersion)
- UCL Discovery (University College London) (submittedVersion)
- arXiv (Cornell University)
- Funders
- National Aeronautics and Space Administration (NAS 526555)
- W. M. Keck Foundation
- California Institute of Technology
- Space Telescope Science Institute (NAS5- 26555, 26555)
- Topics
- Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Galaxies: Formation, Evolution, Phenomena
- Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Astrophysical Phenomena and Observations
- Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Stellar, planetary, and galactic studies
- Keywords
- quiescent galaxies, high-redshift galaxies, gravitational lensing, galaxy clusters, stellar populations, stellar ages, stellar mass, galaxy structure, lens modeling, mass-size relation, emission line ratios, [N II]/Hα ratio, H-alpha equivalent width, gas kinematics, shock, AGN feedback, galaxy formation
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