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A Detection of Weak Lensing Magnification using Galaxy Sizes and Magnitudes
Fabian Schmidt, Alexie Leauthaud, Richard Massey +5
Weak lensing is commonly measured using shear through galaxy ellipticities, or using the effect of magnification bias on galaxy number densities. Here, we report on the first detec…
Measuring the Geometry of the Universe from Weak Gravitational Lensing behind Galaxy Groups in the HST COSMOS survey
James E. Taylor, Richard J. Massey, Alexie Leauthaud +12
Gravitational lensing can provide pure geometric tests of the structure of space-time, for instance by determining empirically the angular diameter distance-redshift relation. This…
Magnification by Galaxy Group Dark Matter Halos
Jes Ford, Hendrik Hildebrandt, Ludovic Van Waerbeke +6
We report on the detection of gravitational lensing magnification by a population of galaxy groups, at a significance level of 4.9 sigma. Using X-ray selected groups in the COSMOS…
A Novel Method to Identify AGNs Based on Emission Line Excess and the Nature of Low-luminosity AGNs in the Sloan Digital Sky Survey: II - Nature of Low-luminosity AGNs
Masayuki Tanaka
We develop a novel method to identify active galactic nuclei (AGNs) and study the nature of low-luminosity AGNs in the Sloan Digital Sky Survey. This is the second part of a series…
A Novel Method to Identify AGNs Based on Emission Line Excess and the Nature of Low-luminosity AGNs in the Sloan Digital Sky Survey: I - A Novel Method
Masayuki Tanaka
(Abridged) We develop a novel technique to identify active galactic nuclei (AGNs) and study the nature of low-luminosity AGNs in the Sloan Digital Sky Survey. This is the first par…
Structure of Protocluster Galaxies: Accelerated Structural Evolution in Overdense Environments?
A. W. Zirm, S. Toft, M. Tanaka
We present a high spatial-resolution HST/NICMOS imaging survey in the field of a known protocluster surrounding the powerful radio galaxy MRC1138-262 at z=2.16. Previously, we have…