scholarly journals Gravitational Microlensing of Giant Luminous Arcs: a Test for Compact Dark Matter in Clusters of Galaxies

2001 ◽  
Vol 18 (2) ◽  
pp. 182-185
Author(s):  
Geraint F. Lewis
Keyword(s):  
Dark Matter ◽  
Gravitational Lensing ◽  
Surface Brightness ◽  
Hubble Space Telescope ◽  
Stellar Mass ◽  
Compact Objects ◽  
Clusters Of Galaxies ◽  
True Nature ◽  
Space Telescope ◽  
The Universe

AbstractThe true nature of dark matter in the universe still eludes us. This paper discusses a new test for the detection of stellar mass compact dark matter in galaxy clusters by observing its gravitational lensing influence on the surface brightness of giant luminous arcs. If dark matter is in the form of stellar mass compact objects, then the extremes of such variability are accessible to a monitoring campaign with the Hubble Space Telescope. With the advent of the Next Generation Space Telescope, cluster dark matter in the form of compact objects will induce a ubiquitous ‘shimmering’ of the giant arcs.

scholarly journals Gravitational lenses as probes of the distribution of dark matter in the universe

1986 ◽  
Vol 119 ◽  
pp. 545-546
Author(s):  
R. Cowsik ◽  
P. Ghosh
Keyword(s):  
Dark Matter ◽  
Gravitational Lensing ◽  
Clusters Of Galaxies ◽  
Gravitational Lenses ◽  
The Universe ◽  
Individual Galaxies

Studies of the characteristic properties of gravitational lensing by clusters of galaxies suggest that the dark matter in them is probably smoothly distributed on the scale of the cluster itself, rather than being clumped into halos around individual galaxies.

scholarly journals Probing the faintest galaxy population at the epoch of reionization with gravitational lensing

2019 ◽  
Vol 15 (S352) ◽  
pp. 26-26
Author(s):  
Hakim Atek
Keyword(s):  
Gravitational Lensing ◽  
Hubble Space Telescope ◽  
Space Telescope ◽  
Systematic Uncertainties ◽  
James Webb Space Telescope ◽  
Exciting Opportunity ◽  
Complete Dataset ◽  
Galaxy Populations ◽  
Galaxy Population ◽  
The Universe

AbstractUltra-deep observations of blank fields with the Hubble Space Telescope have made important inroads in characterizing galaxy populations at redshift z = 6 – 10. Gravitational lensing by massive galaxy clusters offers a new route to identify the faintest sources at the epoch of reionization. In particular, thanks to the Hubble Frontier Fields program, we robustly pushed the detection limit down to MAB = − 15 mag at z ∼ 6. I will present the latest results based on the complete dataset of the HFF clusters and parallel fields, and their implications on the ability of galaxies to reionize the Universe. I will also discuss the results of a comprehensive end-to-end modeling effort towards constraining the systematic uncertainties of the lens models, which are currently the last hurdle before extending the UV LF to fainter luminosities. Finally, I will discuss the great discoveries awaiting combination of such cosmic lenses with the upcoming James Webb Space Telescope and the exciting opportunity to probe the turnover of the UV LF, hence the limit of the star formation process at those early epochs.

The present status of the decaying neutrino theory

1994 ◽  
Vol 346 (1678) ◽  
pp. 137-141 ◽  
Keyword(s):  
Dark Matter ◽  
Present Status ◽  
Hubble Space Telescope ◽  
Supporting Evidence ◽  
Clusters Of Galaxies ◽  
Space Telescope ◽  
Recent Developments ◽  
Neutrino Theory

The present status of the decaying neutrino theory is reviewed. Three recent developments are highlighted: ( a ) the proposal that the dark matter in rich clusters of galaxies is mainly baryonic; ( b ) the implications of the hypothesis that decay photons are the solution of the C 0 /CO ratio problem; ( c ) the strong supporting evidence from recent observations with the Hubble space telescope.

scholarly journals Asymmetric surface brightness structure of caustic crossing arc in SDSS J1226+2152: a case for dark matter substructure

2020 ◽  
Vol 495 (3) ◽  
pp. 3192-3208
Author(s):  
Liang Dai ◽  
Alexander A Kaurov ◽  
Keren Sharon ◽  
Michael Florian ◽  
Jordi Miralda-Escudé ◽  
...  
Keyword(s):  
Dark Matter ◽  
Surface Brightness ◽  
Cold Dark Matter ◽  
Hubble Space Telescope ◽  
Galaxy Cluster ◽  
Critical Curve ◽  
Space Telescope ◽  
Star Forming ◽  
James Webb Space Telescope ◽  
Image Pairs

ABSTRACT We study the highly magnified arc SGAS J122651.3+215220 caused by a star-forming galaxy at zs = 2.93 crossing the lensing caustic cast by the galaxy cluster SDSS J1226+2152 (zl = 0.43), using Hubble Space Telescope observations. We report in the arc several asymmetric surface brightness features whose angular separations are a fraction of an arcsecond from the lensing critical curve and appear to be highly but unequally magnified image pairs of underlying compact sources, with one brightest pair having clear asymmetry consistently across four filters. One explanation of unequal magnification is microlensing by intracluster stars, which induces independent flux variations in the images of individual or groups of source stars in the lensed galaxy. For a second possibility, intracluster dark matter subhaloes invisible to telescopes effectively perturb lensing magnifications near the critical curve and give rise to persistently unequal image pairs. Our modelling suggests, at least for the most prominent identified image pair, that the microlensing hypothesis is in tension with the absence of notable asymmetry variation over a six-year baseline, while subhaloes of ∼106–$10^8\, \mathrm{ M}_\odot$ anticipated from structure formation with cold dark matter typically produce stationary and sizable asymmetries. We judge that observations at additional times and more precise lens models are necessary to stringently constrain temporal variability and robustly distinguish between the two explanations. The arc under this study is a scheduled target of a Director’s Discretionary Early Release Science program of the James Webb Space Telescope, which will provide deep images and a high-resolution view with integral field spectroscopy.

scholarly journals Mapping Dark Matter Near Galaxy Clusters

1996 ◽  
Vol 173 ◽  
pp. 107-112
Author(s):  
J.A. Tyson
Keyword(s):  
Dark Matter ◽  
Galaxy Clusters ◽  
Gravitational Lensing ◽  
Total Mass ◽  
Surface Brightness ◽  
Rest Frame ◽  
Light Distribution ◽  
Clusters Of Galaxies ◽  
Direct Measure ◽  
V Band

Weak gravitational lensing can provide a direct measure of mass overdensity on scales of kpc to several Mpc. The total mass and light distribution in a survey of 32 clusters of galaxies is reviewed. The mass is derived from apodized inversion of thousands of weak lensing arclets in deep CCD shift-and-stare exposures to uniform faint surface brightness in two colors. Rest frame V band mass-to-light ratios of several hundred h solar are found.

scholarly journals The Cores of Cluster Lenses

1996 ◽  
Vol 173 ◽  
pp. 113-118 ◽  
Author(s):  
J.P. Kneib ◽  
G. Soucail
Keyword(s):  
Mass Distribution ◽  
Efficient Method ◽  
Gravitational Lensing ◽  
Hubble Space Telescope ◽  
Statistical Properties ◽  
Clusters Of Galaxies ◽  
Space Telescope

The gravitational lensing of faint background galaxies by rich clusters is emerging as a very efficient method both to constrain the mass distribution of clusters of galaxies and to probe the statistical properties of faint background galaxies. We review results concerning the cores of cluster lenses, where recent Hubble Space Telescope (HST) images are giving new insights into the gravitational distortion phenomena.

scholarly journals A Search for Gravitational Lensing

1987 ◽  
Vol 117 ◽  
pp. 240-240
Author(s):  
J. N. Hewitt ◽  
G. I. Langston ◽  
J. H. Mahoney ◽  
B. F. Burke ◽  
E. L. Turner ◽  
...  
Keyword(s):  
Dark Matter ◽  
Gravitational Lensing ◽  
Large Scale ◽  
Clusters Of Galaxies ◽  
Dynamics Of Galaxies ◽  
The Universe ◽  
Nature Of Matter

Gravitational interactions allow one to investigate the nature of matter in the universe independent of the properties that make it luminous. Much as studies of the dynamics of galaxies and clusters of galaxies have indicated the presence of dark matter, gravitational lensing provides an independent probe of the large scale distribution of dark matter in the universe.

scholarly journals Substructure in the Frontier Fields from weak lensing flexion

2015 ◽  
Vol 11 (A29B) ◽  
pp. 795-796
Author(s):  
Markus Rexroth
Keyword(s):  
Dark Matter ◽  
Gravitational Lensing ◽  
Hubble Space Telescope ◽  
Second Order ◽  
Weak Lensing ◽  
Weak Gravitational Lensing ◽  
Space Telescope ◽  
Highly Sensitive ◽  
Lensing Effect ◽  
Preliminary Application

AbstractFlexion is the second order weak gravitational lensing effect responsible for the arclike appearance of sources. It is highly sensitive to dark matter substructure and can greatly increase the resolution of mass maps, but it is very hard to measure. We present an automated flexion measurement pipeline for Hubble Space Telescope data and a preliminary application to the Frontier Fields cluster MACSJ0416.1-2403.

scholarly journals The Frontier Fields: Past, Present, and Future

2015 ◽  
Vol 11 (A29B) ◽  
pp. 751-754
Author(s):  
Jennifer Lotz ◽  
Keyword(s):  
Hubble Space Telescope ◽  
Clusters Of Galaxies ◽  
High Magnification ◽  
Human Knowledge ◽  
Space Telescope ◽  
Discretionary Time ◽  
James Webb Space Telescope ◽  
Distant Galaxies ◽  
Future Space ◽  
The Universe

AbstractExceptionally deep observations of the distant universe with the Hubble Space Telescope have consistently pushed the frontiers of human knowledge. How deep can we go? What are the faintest and most distant galaxies we can see with the Hubble Space Telescope now, before the launch of the James Webb Space Telescope? This is the challenge taken up by the Frontier Fields, a director's discretionary time campaign with HST and the Spitzer Space Telescope to see deeper into the universe than ever before. The Frontier Fields combines the power of HST with the natural gravitational telescopes of high-magnification clusters of galaxies to produce the deepest observations of clusters and their lensed galaxies ever obtained. I will review the original goals of the Frontier Fields program and its progress over the last several years. In addition to pushing forward the study of the most distant galaxies, the Frontier Fields have been transformative in the study of galaxy clusters and their lensing properties. Finally, I will discuss the prospects for studying galaxies at cosmic dawn with JWST, extremely large ground-based telescopes, and future space missions over the next decade and beyond.

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