Weak lensing observations of the "dark" cluster MG2016+112

Abstract

We investigate the possible existence of a high-redshift (z=1) cluster of galaxies associated with the QSO lens system MG2016+112. From an ultra-deep R- and less deep V- and I-band Keck images and a K-band mosaic from UKIRT, we detect ten galaxies with colors consistent with the lensing galaxy within 225h^{-1} kpc of the z=1.01 lensing galaxy. This represents an overdensity of more than ten times the number density of galaxies with similar colors in the rest of the image. We also find a group of seven much fainter objects closely packed in a group only 27h^{-1} kpc north-west of the lensing galaxy. We perform a weak lensing analysis on faint galaxies in the R-band image and detect a mass peak of a size similar to the mass inferred from X-ray observations of the field, but located 64" northwest of the lensing galaxy. From the weak lensing data we rule out a similar sized mass peak centered on the lensing galaxy at the 2 sigma level.

9 pages, 10 figures, submitted to A&A version with figure 4 at higher resolution can be downloaded from http://www.mpa-garching.mpg.de/~clowe/mg2016aa.ps.gz

References in corpus (11)

• Maps of Dust IR Emission for Use in Estimation of Reddening and CMBR Foregrounds
• A Method for Weak Lensing Observations
• Detection of weak lensing by a cluster of galaxies at z=0.83
• A High Merger Fraction in the Rich Cluster MS1054-03 at z=0.83: Direct Evidence for Hierarchical Formation of Massive Galaxies
• Weak Lensing by High-Redshift Clusters of Galaxies - I: Cluster Mass Reconstruction
• The Faint End of the Galaxy Luminosity Function In Moderate Redshift Clusters
• The luminosity function of dwarf galaxies in four spiral-rich groups
• Near-infrared luminosity function and colours of dwarf galaxies in the Coma Cluster
• Deep Imaging of AXJ2019+112: The Luminosity of a ``Dark Cluster''
• Evolution of the near-infrared luminosity function in rich galaxy clusters
• Spectroscopic confirmation of a cluster of galaxies at z=1 in the field of the gravitational lens MG2016+112

Cited by in corpus (10)

• A MaxBCG Catalog of 13,823 Galaxy Clusters from the Sloan Digital Sky Survey
• On the efficiency and reliability of cluster mass estimates based on member galaxies
• The Cut & Enhance method : selecting clusters of galaxies from the SDSS commissioning data
• First Results On Shear-Selected Clusters From the Deep Lens Survey: Optical Imaging, Spectroscopy, and X-ray Followup
• The stellar velocity dispersion of the lens galaxy in MG2016+112 at z=1.004
• The role of luminous substructure in the gravitational lens system MG 2016+112
• Weak Lensing Discovery and Tomography of a Cluster at z=0.68
• 2016+112: A Gravitationally Lensed Type-II Quasar
• The galaxy population of the z=1 cluster of galaxies MG2016+112
• Spectroscopic confirmation of a cluster of galaxies at z=1 in the field of the gravitational lens MG2016+112