PLCK G165.7+67.0: Analysis of a Massive Lensing Cluster in a Hubble Space Telescope Census of Submillimeter Giant Arcs Selected Using Planck/Herschel

Frye, Brenda L.; Pascale, Massimo; Qin, Yujing; Zitrin, Adi; Diego, José; Walth, Greg; Yan, Haojing; Conselice, Christopher J.; Alpaslan, Mehmet; Bauer, Adam; Busoni, Lorenzo; Coe, Dan; Cohen, Seth H.; Dole, Hervé; Donahue, Megan; Georgiev, Iskren; Jansen, Rolf A.; Limousin, Marceau; Livermore, Rachael; Norman, Dara; Rabien, Sebastian; Windhorst, Rogier A.

Abstract

© 2019. The American Astronomical Society. All rights reserved.. We present Hubble Space Telescope WFC3-IR imaging in the fields of six apparently bright dusty star-forming galaxies (DSFGs) at z = 2-4 identified by their rest-frame far-infrared colors using the Planck and Herschel space facilities. We detect near-infrared counterparts for all six submillimeter sources, allowing us to undertake strong-lensing analyses. One field in particular stands out for its prominent giant arcs, PLCK G165.7+67.0 (G165). After combining the color and morphological information, we identify 11 sets of image multiplicities in this one field. We construct a strong-lensing model constrained by this lensing evidence, which uncovers a bimodal spatial mass distribution, and from which we measure a mass of (2.6 ±0.11) ×10 14 M o within ∼250 kpc. The bright (S 350 ≈ 750 mJy) DSFG appears as two images: a giant arc with a spatial extent of that is merging with the critical curve, and a lower-magnification counterimage that is detected in our new longer-wavelength ground- and space-based imaging data. Using our ground-based spectroscopy, we calculate a dynamical mass of M o to the same fixed radius, although this value may be inflated relative to the true value if the velocity distribution is enhanced in the line-of-sight direction. We suggest that the bimodal mass taken in combination with the weak X-ray flux and low SZ decrement may be explained as a pre-merger for which the intracluster gas is diluted along the line of sight, while the integrated surface mass density is supercritical to strong-lensing effects.

Citation

Frye, B. L., Pascale, M., Qin, Y., Zitrin, A., Diego, J., Walth, G., …Windhorst, R. A. (2019). PLCK G165.7+67.0: Analysis of a Massive Lensing Cluster in a Hubble Space Telescope Census of Submillimeter Giant Arcs Selected Using Planck/Herschel. Astrophysical Journal, 871(1), Article 51. https://doi.org/10.3847/1538-4357/aaeff7

• Journal Article Type: Article
• Acceptance Date: Nov 7, 2018
• Online Publication Date: Jan 21, 2019
• Publication Date: Jan 21, 2019
• Deposit Date: Mar 13, 2019
• Publicly Available Date: Mar 13, 2019
• Journal: Astrophysical Journal
• Print ISSN: 0004-637X
• Publisher: American Astronomical Society
• Peer Reviewed: Peer Reviewed
• Volume: 871
• Issue: 1
• Article Number: 51
• DOI: https://doi.org/10.3847/1538-4357/aaeff7
• Public URL: https://nottingham-repository.worktribe.com/output/1636081
• Publisher URL: https://iopscience.iop.org/article/10.3847/1538-4357/aaeff7/meta
• Additional Information: Journal title: The Astrophysical Journal; Article type: paper; Article title: PLCK G165.7+67.0: Analysis of a Massive Lensing Cluster in a Hubble Space Telescope Census of Submillimeter Giant Arcs Selected Using Planck/Herschel; Copyright information: © 2019. The American Astronomical Society. All rights reserved.; Date received: 2018-05-10; Date accepted: 2018-11-07; Online publication date: 2019-01-21