MC²: Subaru and Hubble Space Telescope Weak-lensing Analysis of the Double Radio Relic Galaxy Cluster PLCK G287.0+32.9

December 2017 • 2017ApJ...851...46F

Authors • Finner, Kyle • Jee, M. James • Golovich, Nathan • Wittman, David • Dawson, William • Gruen, Daniel • Koekemoer, Anton M. • Lemaux, Brian C. • Seitz, Stella

Abstract • The second most significant detection of the Planck Sunyaev-Zel’dovich survey, PLCK G287.0+32.9 (z = 0.385), boasts two similarly bright radio relics and a radio halo. One radio relic is located ∼ 400 {kpc} NW of the X-ray peak and the other ∼ 2.8 Mpc to the SE. This large difference suggests that a complex merging scenario is required. A key missing puzzle for the merging scenario reconstruction is the underlying dark matter distribution in high resolution. We present a joint Subaru Telescope and Hubble Space Telescope weak-lensing analysis of the cluster. Our analysis shows that the mass distribution features four significant substructures. Of the substructures, a primary cluster of mass {M}_200{{c}}={1.59}_-0.22^+0.25× {10}¹⁵ {h}₇₀^-1 {M}_⊙ dominates the weak-lensing signal. This cluster is likely to be undergoing a merger with one (or more) subcluster whose mass is approximately a factor of 10 lower. One candidate is the subcluster of mass {M}_200{{c}}={1.16}_-0.13^+0.15× {10}¹⁴ {h}₇₀^-1 {M}_⊙ located ∼ 400 {kpc} to the SE. The location of this subcluster suggests that its interaction with the primary cluster could be the source of the NW radio relic. Another subcluster is detected ∼ 2 Mpc to the SE of the X-ray peak with mass {M}_200{{c}}={1.68}_-0.20^+0.22× {10}¹⁴ {h}₇₀^-1 {M}_⊙ . This SE subcluster is in the vicinity of the SE radio relic and may have created the SE radio relic during a past merger with the primary cluster. The fourth subcluster, {M}_200{{c}}={1.87}_-0.22^+0.24× {10}¹⁴ {h}₇₀^-1 {M}_⊙ , is NW of the X-ray peak and beyond the NW radio relic.

Links

• PREPRINT http://arxiv.org/abs/1710.02527
• NED https://ned.ipac.caltech.edu/uri/NED::InRefcode/2017ApJ...851...46F
• ELECTR https://doi.org/10.3847%2F1538-4357%2Faa998c
• SIMBAD http://simbad.u-strasbg.fr/simbo.pl?bibcode=2017ApJ...851...46F
• PDF https://iopscience.iop.org/article/10.3847/1538-4357/aa998c/pdf
• PDF https://stacks.iop.org/0004-637X/851/46/pdf
• DATA https://archive.stsci.edu/mastbibref.php?bibcode=2017ApJ...851...46F
• DATA https://hst.esac.esa.int/ehst/#/pages/search;bibcode=2017ApJ...851...46F
• DATA https://irsa.ipac.caltech.edu/bibdata/2017/F/2017ApJ...851...46F.html
• DATA https://nxsa.esac.esa.int/nxsa-web/#bibcode=2017ApJ...851...46F