Weak Gravitational Lensing by a Sample of X‐Ray–luminous Clusters of Galaxies. III. Serendipitous Weak Lensing Detections of Dark and Luminous Mass Concentrations

2003 ◽  
Vol 591 (2) ◽  
pp. 662-676 ◽  
Author(s):  
Hakon Dahle ◽  
Kristian Pedersen ◽  
Per B. Lilje ◽  
Steve J. Maddox ◽  
Nick Kaiser
Keyword(s):  
Gravitational Lensing ◽  
Weak Lensing ◽  
Clusters Of Galaxies ◽  
Weak Gravitational Lensing ◽  
X Ray ◽  
Mass Concentrations

Weak Gravitational Lensing by a Sample of X‐Ray–luminous Clusters of Galaxies. II. Comparison with Virial Masses

2002 ◽  
Vol 579 (1) ◽  
pp. 227-235 ◽  
Author(s):  
Ragnvald J. Irgens ◽  
Per B. Lilje ◽  
Hakon Dahle ◽  
S. J. Maddox
Keyword(s):  
Gravitational Lensing ◽  
Clusters Of Galaxies ◽  
Weak Gravitational Lensing ◽  
X Ray

Weak Gravitational Lensing by a Sample of X‐Ray Luminous Clusters of Galaxies. I. The Data Set

2002 ◽  
Vol 139 (2) ◽  
pp. 313-368 ◽  
Author(s):  
Hakon Dahle ◽  
Nick Kaiser ◽  
Ragnvald J. Irgens ◽  
Per B. Lilje ◽  
Steve J. Maddox
Keyword(s):  
Gravitational Lensing ◽  
Clusters Of Galaxies ◽  
Data Set ◽  
Weak Gravitational Lensing ◽  
X Ray

scholarly journals XMM-Newton X-ray and HST weak gravitational lensing study of the extremely X-ray luminous galaxy cluster Cl J120958.9+495352 (z = 0.902)

2018 ◽  
Vol 610 ◽  
pp. A71 ◽  
Author(s):  
Sophia Thölken ◽  
Tim Schrabback ◽  
Thomas H. Reiprich ◽  
Lorenzo Lovisari ◽  
Steven W. Allen ◽  
...  
Keyword(s):  
Temperature Profile ◽  
Gravitational Lensing ◽  
Mass Fraction ◽  
High Redshift ◽  
Galaxy Cluster ◽  
Cooling Time ◽  
Weak Lensing ◽  
Imaging Data ◽  
Weak Gravitational Lensing ◽  
X Ray

Context. Observations of relaxed, massive, and distant clusters can provide important tests of standard cosmological models, for example by using the gas mass fraction. To perform this test, the dynamical state of the cluster and its gas properties have to be investigated. X-ray analyses provide one of the best opportunities to access this information and to determine important properties such as temperature profiles, gas mass, and the total X-ray hydrostatic mass. For the last of these, weak gravitational lensing analyses are complementary independent probes that are essential in order to test whether X-ray masses could be biased. Aims. We study the very luminous, high redshift (z = 0.902) galaxy cluster Cl J120958.9+495352 using XMM-Newton data. We measure global cluster properties and study the temperature profile and the cooling time to investigate the dynamical status with respect to the presence of a cool core. We use Hubble Space Telescope (HST) weak lensing data to estimate its total mass and determine the gas mass fraction. Methods. We perform a spectral analysis using an XMM-Newton observation of 15 ks cleaned exposure time. As the treatment of the background is crucial, we use two different approaches to account for the background emission to verify our results. We account for point spread function effects and deproject our results to estimate the gas mass fraction of the cluster. We measure weak lensing galaxy shapes from mosaic HST imaging and select background galaxies photometrically in combination with imaging data from the William Herschel Telescope. Results. The X-ray luminosity of Cl J120958.9+495352 in the 0.1–2.4 keV band estimated from our XMM-Newton data is LX = (13.4−1.0+1.2) × 1044 erg/s and thus it is one of the most X-ray luminous clusters known at similarly high redshift. We find clear indications for the presence of a cool core from the temperature profile and the central cooling time, which is very rare at such high redshifts. Based on the weak lensing analysis, we estimate a cluster mass of M500 / 1014 M⊙ = 4.4−2.0+2.2(star.) ± 0.6(sys.) and a gas mass fraction of fgas,2500 = 0.11−0.03+0.06 in good agreement with previous findings for high redshift and local clusters.

scholarly journals A 71 Megapixel Mosaic Camera For Weak Lensing At APO

1996 ◽  
Vol 173 ◽  
pp. 81-82
Author(s):  
A. Diercks ◽  
C. Stubbs ◽  
C. Hogan ◽  
E. Adelberger
Keyword(s):  
Dark Matter ◽  
New Mexico ◽  
Gravitational Lensing ◽  
Ccd Camera ◽  
Weak Lensing ◽  
Wide Field ◽  
Clusters Of Galaxies ◽  
Camera System ◽  
Weak Gravitational Lensing

We are developing a wide-field CCD camera system which is optimized for using weak gravitational lensing to study the distribution of dark matter in clusters of galaxies and eventually the field. The system will be used at the Apache Point Observatory (APO) 3.5 meter telescope in New Mexico.

scholarly journals Cluster–galaxy weak lensing

2020 ◽  
Vol 28 (1) ◽  
Author(s):  
Keiichi Umetsu
Keyword(s):  
Galaxy Clusters ◽  
Gravitational Lensing ◽  
First Principles ◽  
Weak Lensing ◽  
Mass Relation ◽  
Matter Distribution ◽  
Cluster Galaxy ◽  
Weak Gravitational Lensing ◽  
Mass Calibration ◽  
Theoretical Foundations

AbstractWeak gravitational lensing of background galaxies provides a direct probe of the projected matter distribution in and around galaxy clusters. Here, we present a self-contained pedagogical review of cluster–galaxy weak lensing, covering a range of topics relevant to its cosmological and astrophysical applications. We begin by reviewing the theoretical foundations of gravitational lensing from first principles, with a special attention to the basics and advanced techniques of weak gravitational lensing. We summarize and discuss key findings from recent cluster–galaxy weak-lensing studies on both observational and theoretical grounds, with a focus on cluster mass profiles, the concentration–mass relation, the splashback radius, and implications from extensive mass-calibration efforts for cluster cosmology.

Weak Lensing By Individual Galaxies

1996 ◽  
Vol 173 ◽  
pp. 183-188
Author(s):  
Tereasa G. Brainerd ◽  
Roger D. Blandford ◽  
Ian Smail
Keyword(s):  
Gravitational Lensing ◽  
Angular Separation ◽  
Weak Lensing ◽  
Bright Galaxy ◽  
Weak Gravitational Lensing ◽  
Circular Velocity ◽  
Angular Extent ◽  
Individual Galaxies ◽  
Lens Galaxies

In this paper we report on an investigation of statistical weak gravitational lensing of cosmologically distant faint galaxies by foreground galaxies. The signal we seek is a distortion of the images of faint galaxies resulting in a weakly preferred tangential alignment of faint galaxies around brighter galaxies. That is, if the faint galaxies have been gravitationally lensed by the brighter systems, the major axes of their images will tend to lie perpendicular to the radius vectors joining the centroids of the faint and bright galaxies (Fig. 1). Modeling a lens galaxy as a singular isothermal sphere with circular velocity Vc, an ellipticity of ∼ 2πVc2 /c2θ is induced in the image of a source galaxy at an angular separation θ from the lens. This is of order a few percent for faint–bright galaxy pairs with separations θ ∼ 30″ where the lens is a typical bright spiral. Over 1000 pairs must be measured in order to detect such a signal in the presence of the noise associated with the intrinsic galaxy shapes. Given a sufficiently large number of pairs, it may be possible to use the variation of the induced ellipticity with θ to study the angular extent of the halos of the lens galaxies.

Weak lensing by X-ray luminous clusters of galaxies at z>0.5

1996 ◽  
Vol 51 (2) ◽  
pp. 107-113 ◽  
Author(s):  
G.A. Luppino ◽  
Nick Kaiser ◽  
D.I. Clowe ◽  
I.M. Gioia ◽  
M.R. Metzger
Keyword(s):  
Weak Lensing ◽  
Clusters Of Galaxies ◽  
X Ray

scholarly journals Gravitational Lensing of the X‐Ray Background by Clusters of Galaxies

1997 ◽  
Vol 478 (2) ◽  
pp. 476-491 ◽  
Author(s):  
Alexandre Refregier ◽  
Abraham Loeb
Keyword(s):  
Gravitational Lensing ◽  
Clusters Of Galaxies ◽  
X Ray ◽  
X Ray Background
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