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
AuthorFrye, Brenda L.
Conselice, Christopher J.
Cohen, Seth H.
Jansen, Rolf A.
Windhorst, Rogier A.
AffiliationUniv Arizona, Steward Observ
Keywordsgalaxies: clusters: general
galaxies: fundamental parameters
gravitational lensing: strong
MetadataShow full item record
PublisherIOP PUBLISHING LTD
CitationBrenda L. Frye et al 2019 ApJ 871 51
Rights© 2019. The American Astronomical Society. All rights reserved.
Collection InformationThis item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at email@example.com.
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) x 10(14)M(circle dot) within similar to 250 kpc. The bright (S-350 approximate to 750 mJy) DSFG appears as two images: a giant arc with a spatial extent of 4.'' 5 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) x 10(15) M-circle dot 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.
VersionFinal published version
SponsorsNASA through a grant from the Space Telescope Science Institute - NASA [HST GO-14223, NAS5-26555]; MINECO/FEDER, UE [AYA2015-64508-P]; NASA JWST Interdisciplinary Scientist from NASA Goddard Space Flight Center [NAG5-12460, NNX14AN10G, 80GNSSC18K0200]; UA/NASA Space Grant for Undergraduate Research