skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: MASS SUBSTRUCTURE IN ABELL 3128

Abstract

We perform a detailed two-dimensional weak gravitational lensing analysis of the nearby (z = 0.058) galaxy cluster Abell 3128 using deep ugrz imaging from the Dark Energy Camera (DECam). We have designed a pipeline to remove instrumental artifacts from DECam images and stack multiple dithered observations without inducing a spurious ellipticity signal. We develop a new technique to characterize the spatial variation of the point-spread function that enables us to circularize the field to better than 0.5% and thereby extract the intrinsic galaxy ellipticities. By fitting photometric redshifts to sources in the observation, we are able to select a sample of background galaxies for weak-lensing analysis free from low-redshift contaminants. Photometric redshifts are also used to select a high-redshift galaxy subsample with which we successfully isolate the signal from an interloping z = 0.44 cluster. We estimate the total mass of Abell 3128 by fitting the tangential ellipticity of background galaxies with the weak-lensing shear profile of a Navarro–Frenk–White (NFW) halo and also perform NFW fits to substructures detected in the 2D mass maps of the cluster. This study yields one of the highest resolution mass maps of a low-z cluster to date and is the first step in amore » larger effort to characterize the redshift evolution of mass substructures in clusters.« less

Authors:
; ;  [1]
  1. Department of Physics, Brown University, Box 1843, Providence, RI 02912 (United States)
Publication Date:
OSTI Identifier:
22522403
Resource Type:
Journal Article
Journal Name:
Astrophysical Journal
Additional Journal Information:
Journal Volume: 805; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0004-637X
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; CAMERAS; GALACTIC EVOLUTION; GALAXIES; GALAXY CLUSTERS; GRAVITATIONAL LENSES; IMAGE PROCESSING; IMAGES; MASS; NONLUMINOUS MATTER; PHOTOMETRY; RED SHIFT; SHEAR; TWO-DIMENSIONAL SYSTEMS

Citation Formats

McCleary, J., Dell’Antonio, I., and Huwe, P., E-mail: Jacqueline_McCleary@brown.edu. MASS SUBSTRUCTURE IN ABELL 3128. United States: N. p., 2015. Web. doi:10.1088/0004-637X/805/1/40.
McCleary, J., Dell’Antonio, I., & Huwe, P., E-mail: Jacqueline_McCleary@brown.edu. MASS SUBSTRUCTURE IN ABELL 3128. United States. doi:10.1088/0004-637X/805/1/40.
McCleary, J., Dell’Antonio, I., and Huwe, P., E-mail: Jacqueline_McCleary@brown.edu. Wed . "MASS SUBSTRUCTURE IN ABELL 3128". United States. doi:10.1088/0004-637X/805/1/40.
@article{osti_22522403,
title = {MASS SUBSTRUCTURE IN ABELL 3128},
author = {McCleary, J. and Dell’Antonio, I. and Huwe, P., E-mail: Jacqueline_McCleary@brown.edu},
abstractNote = {We perform a detailed two-dimensional weak gravitational lensing analysis of the nearby (z = 0.058) galaxy cluster Abell 3128 using deep ugrz imaging from the Dark Energy Camera (DECam). We have designed a pipeline to remove instrumental artifacts from DECam images and stack multiple dithered observations without inducing a spurious ellipticity signal. We develop a new technique to characterize the spatial variation of the point-spread function that enables us to circularize the field to better than 0.5% and thereby extract the intrinsic galaxy ellipticities. By fitting photometric redshifts to sources in the observation, we are able to select a sample of background galaxies for weak-lensing analysis free from low-redshift contaminants. Photometric redshifts are also used to select a high-redshift galaxy subsample with which we successfully isolate the signal from an interloping z = 0.44 cluster. We estimate the total mass of Abell 3128 by fitting the tangential ellipticity of background galaxies with the weak-lensing shear profile of a Navarro–Frenk–White (NFW) halo and also perform NFW fits to substructures detected in the 2D mass maps of the cluster. This study yields one of the highest resolution mass maps of a low-z cluster to date and is the first step in a larger effort to characterize the redshift evolution of mass substructures in clusters.},
doi = {10.1088/0004-637X/805/1/40},
journal = {Astrophysical Journal},
issn = {0004-637X},
number = 1,
volume = 805,
place = {United States},
year = {2015},
month = {5}
}