Strong lensing analysis of PLCK G004.5-19.5, a Planck -discovered cluster hosting a radio relic at z = 0.52

Cristóbal Sifón, Felipe Menanteau, John P. Hughes, Mauricio Carrasco, L. Felipe Barrientos

Research output: Contribution to journalArticlepeer-review

Abstract

Context. The recent discovery of a large number of galaxy clusters using the Sunyaev-Zel'dovich (SZ) effect has opened a new era on the study of the most massive clusters in the Universe. Multiwavelength analyses are required to understand the properties of these new sets of clusters, which are a sensitive probe of cosmology. Aims. We aim for a multiwavelength characterization of PLCK G004.5-19.5, one of the most massive X-ray validated SZ effect-selected galaxy clusters discovered by the Planck satellite. Methods. We have observed PLCK G004.5-19.5 with GMOS on the 8.1 m-Gemini South Telescope for optical imaging and spectroscopy, and performed a strong lensing analysis. We also searched for associated radio emission in published catalogs. Results. An analysis of the optical images confirms that this is a massive cluster, with a dominant central galaxy and an accompanying red sequence of galaxies, plus a 14''-long strong lensing arc. Longslit spectroscopy of six cluster members shows that the cluster is at z = 0.516 ± 0.002. We also targeted the strongly lensed arc, and found zarc = 1.601. We use LensTool to carry out a strong lensing analysis, from which we measure a median Einstein radius θ E(zs = 1.6) ≈ 30'' and estimate an enclosed mass M E = 2.45-0.47 +0.45 × 1014 M By extrapolating a Navarro-Frenk-White profile, we find a total mass M 500 SL = 4.0-1.0 +2.1 × 10 14 M. We also include a constraint on the mass from previous X-ray observations, which yields a slightly higher mass, M500 SL+X = 6.7-1.3 +2.6 × 1014 M, consistent with the value from strong lensing alone. Intermediate-resolution radio images from the TIFR GMRT Sky Survey at 150 MHz reveal that PLCK G004.5-19.5 hosts a powerful radio relic on scales ≤500 kpc. Emission at the same location is also detected in low-resolution images at 843 MHz and 1.4 GHz. This is one of the higher redshift radio relics known to date.

Original languageEnglish (US)
Article numberA43
JournalAstronomy and Astrophysics
Volume562
DOIs
StatePublished - Feb 2014

Keywords

  • Cosmology: observations
  • Galaxies: clusters: individual: PLCK G004.5-19.5
  • Gravitational lensing: strong

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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