Sentences with phrase «weak gravitational lensing»

Taking models of galaxies from the Hubble Space Telescope Ultra Deep Field (HUDF) and applying a correction for the HUDF point spread function we generate lensed simulations of deep, opti... ▽ More We present a simulation analysis of weak gravitational lensing flexion and shear measurement using shapelet decomposition, and identify differences between flexion and shear measurement noise in deep survey data.

To do this, they used a technique called weak gravitational lensing.

It will measure weak gravitational lensing deep in space as a way of detecting dark energy and dark matter.

Light from distant galaxies passing through those regions also gets warped, making the galaxies appear streaked and smeared in telescope images, a technique known as weak gravitational lensing.

Abstract: We present a simulation analysis of weak gravitational lensing flexion and shear measurement using shapelet decomposition, and identify differences between flexion and shear measurement noise in deep survey data.

By measuring the CMB polarization data provided by POLARBEAR, a collaboration of astronomers working on a telescope in the high - altitude desert of northern Chile designed specifically to detect «B - mode» polarization, the UC San Diego astrophysicists discovered weak gravitational lensing in their data that, they conclude, permit astronomers to make detailed maps of the structure of the universe, constrain estimates of neutrino mass and provide a firm test for general relativity.

Using the techniques of strong and weak gravitational lensing on archival data obtained from the Hubble Space Telescope, we determine that the average mass overdensity profile of the lenses can be fit wi... ▽ More We measure the average mass properties of a sample of 41 strong gravitational lenses at moderate redshift (z ~ 0.4 - 0.9), and present the lens redshift for 6 of these galaxies for the first time.

This involved writing computer codes that calculate what weak gravitational lensing should look like for a given model.

«We knew that these filaments should also cause a deflection of CMB and would also produce a measurable weak gravitational lensing signal,» said Siyu He, the study's lead author who is a Ph.D. researcher from Carnegie Mellon University — she is now at Berkeley Lab and is also affiliated with UC Berkeley.

Abstract: (Abridged) We examine the effects of charge transfer inefficiency (CTI) during CCD readout on galaxy shape measurements required by studies of weak gravitational lensing.

For their work, Hudson and co-author Seth Epps, who was a master's student at the University of Waterloo at the time of the research, employed a technique called weak gravitational lensing — a statistical measurement of the slight bends that occur in the path of light passing near mass.

Abstract: The GRavitational lEnsing Accuracy Testing 3 (GREAT3) challenge is the third in a series of image analysis challenges, with a goal of testing and facilitating the development of methods for analyzing astronomical images that will be used to measure weak gravitational lensing.

She has since gone on to establish herself in the field of weak gravitational lensing, which involves studying the subtle distortions in images of distant galaxies to probe the nature of mysterious dark matter and dark energy.

It is also possible to use the way the gravity of clusters of galaxies distort more distant background galaxies, weak gravitational lensing, as another tracer.

This is a subtle variant of weak gravitational lensing, in which the light emitted from distant galaxies is slightly warped by the gravitational effect of large amounts of matter, such as galaxy clusters.

Through a process called «weak gravitational lensing,» the distortions in the B - mode polarization pattern, they hoped, would allow astronomers to map regions of the universe filled with invisible «dark matter» and «dark energy» and well as provide a test for general relativity on cosmological scales.

The dark matter distribution was measured by the weak gravitational lensing of the light from visible galaxies by the dark matter (see the relativity chapter).

He was one of the pioneers in describing how this large - scale matter distribution bends light as it travels across the Universe, a phenomenon known as weak gravitational lensing.

This measurement requires extremely precise estimation of very small galaxy shape distortions, in the presence of far large... ▽ More The GRavitational lEnsing Accuracy Testing 3 (GREAT3) challenge is the third in a series of image analysis challenges, with a goal of testing and facilitating the development of methods for analyzing astronomical images that will be used to measure weak gravitational lensing.

The composite image of 23,000 galaxy pairs was created through a technique called weak gravitational lensing.

Astronomers have found a number of uses for ESI, from observing the cosmological effects of weak gravitational lensing to searching for the most metal - poor stars in our galaxy.

Only charge traps with time constants of the same order as the time... ▽ More (Abridged) We examine the effects of charge transfer inefficiency (CTI) during CCD readout on galaxy shape measurements required by studies of weak gravitational lensing.

Researchers used the observed, subtle distortion of the galaxies» shapes to reconstruct the distribution of intervening mass along Hubble's line of sight - a method called weak gravitational lensing.

The dark matter distribution is estimated by the weak gravitational lensing technique.