scholarly journals The Mass Distribution In Clusters Of Galaxies From Weak And Strong Lensing

1996 ◽  
Vol 173 ◽  
pp. 131-136 ◽  
Author(s):  
Jordi Miralda-Escudé
Keyword(s):  
Dark Matter ◽  
Mass Distribution ◽  
Inversion Formula ◽  
Weak Lensing ◽  
Clear Understanding ◽  
Clusters Of Galaxies ◽  
Matter Distribution ◽  
Strong Lensing ◽  
Similar Information ◽  
Dark Matter Distribution

This paper is intended as an introduction to the theory of weak lensing. A review of the inversion formula introduced by Kaiser and Squires is presented. We then prove the formula of the aperture densitometry method in a simple way that allows a clear understanding of where the various terms come from. This is particularly useful to measure quantitatively masses in any region of a lens. We then summarize what has been learned from observations of strong lensing about the dark matter distribution; weak lensing should provide similar information on larger scales in clusters of galaxies.

scholarly journals Constraining the abundance of dark matter in the central region of the galaxy cluster MACS J1206.2−0847 with a free-form strong lensing analysis

2020 ◽  
Vol 639 ◽  
pp. A125
Author(s):  
Alberto Manjón-García ◽  
Jose M. Diego ◽  
Diego Herranz ◽  
Daniel Lam
Keyword(s):  
Dark Matter ◽  
Mass Distribution ◽  
Central Region ◽  
Total Mass ◽  
Galaxy Cluster ◽  
Free Form ◽  
Matter Distribution ◽  
Strong Lensing ◽  
The Galaxy ◽  
Dark Matter Distribution

We performed a free-form strong lensing analysis of the galaxy cluster MACS J1206.2−0847 in order to estimate and constrain its inner dark matter distribution. The free-form method estimates the cluster total mass distribution without using any prior information about the underlying mass. We used 97 multiple lensed images belonging to 27 background sources and derived several models, which are consistent with the data. Among these models, we focus on those that better reproduce the radial images that are closest to the centre of the cluster. These radial images are the best probes of the dark matter distribution in the central region and constrain the mass distribution down to distances ∼7 kpc from the centre. We find that the morphology of the innermost radial arcs is due to the elongated morphology of the dark matter halo. We estimate the stellar mass contribution of the brightest cluster galaxy and subtracted it from the total mass in order to quantify the amount of dark matter in the central region. We fitted the derived dark matter density profile with a gNFW, which is characterised by rs = 167 kpc, ρs = 6.7 × 106 M⊙ kpc−3, and γgNFW = 0.70. These results are consistent with a dynamically relaxed cluster. This inner slope is smaller than the cannonical γ = 1 predicted by standard CDM models. This slope does not favour self-interacting models for which a shallower slope would be expected.

scholarly journals Dark matter and X-ray halo in early-type galaxies and clusters of galaxies

2009 ◽  
Vol 5 (H15) ◽  
pp. 89-90
Author(s):  
Takaya Ohashi
Keyword(s):  
Dark Matter ◽  
Clusters Of Galaxies ◽  
Large Scatter ◽  
Early Type ◽  
Matter Distribution ◽  
X Ray ◽  
Galaxy Groups ◽  
Hot Gas ◽  
Luminous Galaxies ◽  
Dark Matter Distribution

X-ray observations reveal extended halos around early-type galaxies which enable us to trace the dark matter distribution around the galaxies (see Mathews and Brighenti 2003 for a review). X-ray luminosities, LX of massive early-type galaxies are 1040−1042 erg s−1 in 0.3–2 keV. The correlation plot between LX and B-band luminosity LB shows a large scatter in the sense that LX varies by 2 orders of magnitudes for the same LB, in the brightest end (log LB ≳ 10.5). The amount of the X-ray hot gas in early-type galaxies is typically a few % of the stellar mass, in contrast to clusters of galaxies which hold ~5 times more massive gas than stars. Matsushita (2001) showed that X-ray luminous galaxies are characterized by extended X-ray halo with a few tens of re, similar to the scale of galaxy groups, so the presence of group-size potentials would be strongly linked with the problem of large LX scatter.

scholarly journals Evolution of the dark matter distribution with three-dimensional weak lensing

2005 ◽  
Vol 363 (3) ◽  
pp. 723-733 ◽  
Author(s):  
D. J. Bacon ◽  
A. N. Taylor ◽  
M. L. Brown ◽  
M. E. Gray ◽  
C. Wolf ◽  
...  
Keyword(s):  
Dark Matter ◽  
Three Dimensional ◽  
Weak Lensing ◽  
Matter Distribution ◽  
Dark Matter Distribution

scholarly journals Evolution of the Dark Matter Distribution with 3-D Weak Lensing

2004 ◽  
Vol 2004 (IAUS225) ◽  
pp. 37-42
Author(s):  
D. J. Bacon ◽  
A. N. Taylor ◽  
M. L. Brown ◽  
M. E. Gray ◽  
C. Wolf ◽  
...  
Keyword(s):  
Dark Matter ◽  
Weak Lensing ◽  
Matter Distribution ◽  
Dark Matter Distribution

Dark Matter Distribution in X-Ray Clusters of Galaxies

1994 ◽  
pp. 107-111
Author(s):  
Florence Durret ◽  
D. Gerbal ◽  
M. Lachièze-Rey ◽  
G. Lima-Neto ◽  
R. Sadat
Keyword(s):  
Dark Matter ◽  
Clusters Of Galaxies ◽  
Matter Distribution ◽  
X Ray ◽  
Dark Matter Distribution

scholarly journals Dark Matter Distribution of Four Low-z Clusters of Galaxies

2020 ◽  
Vol 893 (1) ◽  
pp. 8
Author(s):  
Jacqueline McCleary ◽  
Ian dell’Antonio ◽  
Anja von der Linden
Keyword(s):  
Dark Matter ◽  
Clusters Of Galaxies ◽  
Matter Distribution ◽  
Dark Matter Distribution

scholarly journals MC2: MAPPING THE DARK MATTER DISTRIBUTION OF THE “TOOTHBRUSH” CLUSTER RX J0603.3+4214 WITHHUBBLE SPACE TELESCOPEAND SUBARU WEAK LENSING

2016 ◽  
Vol 817 (2) ◽  
pp. 179 ◽  
Author(s):  
M. James Jee ◽  
William A. Dawson ◽  
Andra Stroe ◽  
David Wittman ◽  
Reinout J. van Weeren ◽  
...  
Keyword(s):  
Dark Matter ◽  
Weak Lensing ◽  
Matter Distribution ◽  
Dark Matter Distribution

scholarly journals Dark Matter Distribution in Nearby Galaxies

2004 ◽  
Vol 220 ◽  
pp. 327-328
Author(s):  
Olivia Garrido ◽  
Philippe Amram ◽  
Claude Carignan ◽  
Sébastien Blais-Ouellette ◽  
Michel Marcelin ◽  
...  
Keyword(s):  
Dark Matter ◽  
High Resolution ◽  
Mass Distribution ◽  
Rotation Curve ◽  
Velocity Fields ◽  
Constant Density ◽  
Matter Distribution ◽  
Fabry Perot ◽  
Nearby Galaxies ◽  
Dark Matter Distribution

We present results obtained from a study of the mass distribution of 24 galaxies observed using Fabry-Pérot techniques, as part of the GHASP survey (see Russeil et al., this meeting). For each galaxy, we combined high resolution Hα rotation curves derived from 2-D velocity fields, with low resolution HI data, in order to determine accurately the inner slope of the rotation curve which strongly constrains the distribution of matter. Our work suggests the existence of a constant density core in the center of the dark halos.

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