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New HST imaging and strong gravitational lensing models of galaxy-overdense fields selected by color using Planck and Herschel

AuthorsPascale, Massimo; Frye, Brenda; Zitrin, Adi; Diego, José María ; Coe, Daniel; Cohen, Seth; Jansen, Rolf A.; Windhorst, Rogier A.
Issue Date2019
Citation233rd American Astronomical Society Meeting (2019)
AbstractWe present strong lensing analysis of six galaxy clusters selected by their far-infrared colors using Planck/Herschel (and not by the Sunyaev-Zel'dovich effect). Each cluster has a Dusty Star Forming Galaxy (DSFG) in its background which is ultra-bright as a result of gravitational lensing by the foreground cluster. These are some of the brightest DSFGs on the sky, owing to high magnification factors of ≥10. HST WFC3-NIR imaging in the F110W and F160W filters allows for detailed studies of the lensed DSFGs and other giant arcs in the field. In particular, we find in five of six cases that the image of the DSFG appears in more than one location in the image plane. These >arclet families> provide powerful constraints on the distribution of the dark matter. Our search for image families is complemented also by our adaptive optics-corrected K-band imaging (seeing of 0.3 arcsec) using LBT LUCI-ARGOS to confirm the red arc colors. By using the positions and brightnesses of the cluster members as luminous indicators of the underlying dark matter, in conjunction with the lensing constraints from the positions and parities of the arclet family members, we constructed a light-traces-mass model for each of the clusters. One cluster in particular, PLCK G165.7+67.0 (G165), is especially rich in arcs, with 11 identified image families confirmed by our mass model. Our analysis yields a mass of 2.6 ± 0.11 × 1014 solar masses for this cluster, which is a factor of five lower than our value measured for the dynamical mass based off of our spectroscopy. We interpret this to mean that the dynamical mass may be inflated owing to a possible line-of-sight (non-spherical) cluster configuration. In sum, given the rich systems of arcs combined with the unusually-low X-ray flux and weak SZ decrement, we conclude that this cluster is an example of pre-merger of two smaller galaxy clusters.
DescriptionTrabajo presentado al 233rd American Astronomical Society Meeting (AAS), celebrado en Seattle (USA) del 6 al 10 de enero de 2019.
Appears in Collections:(IFCA) Comunicaciones congresos
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