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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

AuthorsFrye, Brenda; Diego, José María
Issue Date2019
PublisherIOP Publishing
CitationAstrophysical Journal 871(1): 51 (2019)
AbstractWe 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) × 1014 M ⊙ 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 ${1.3}_{-0.70}^{+0.04}\times {10}^{15}$ M ⊙ 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.
Descriptionet al.
Publisher version (URL)https://doi.org/10.3847/1538-4357/aaeff7
Identifiersdoi: 10.3847/1538-4357/aaeff7
e-issn: 1538-4357
issn: 0004-637X
Appears in Collections:(IFCA) Artículos
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