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In 2009, weak gravitational lensing was used to extend the mass-X-ray-luminosity relation to older and smaller structures than was previously possible to improve measurements of distant galaxies. [29] As of 2013 the most distant gravitational lens galaxy, J1000+0221, had been found using NASA's Hubble Space Telescope.
Launched on Dec. 25, 2021, the Webb telescope orbits the sun about 1 million miles from Earth and gathers data to help astronomers study every phase of the history of the universe, from the Big ...
Microlensing is caused by the same physical effect as strong gravitational lensing and weak gravitational lensing but it is studied by very different observational techniques. In strong and weak lensing, the mass of the lens is large enough (mass of a galaxy or galaxy cluster) that the displacement of light by the lens can be resolved with a ...
Gravitational microlensing occurs when the gravitational field of a star acts like a lens, magnifying the light of a distant background star. This effect occurs only when the two stars are almost exactly aligned. Lensing events are brief, lasting for weeks or days, as the two stars and Earth are all moving relative to each other.
While gravitational lensing preserves surface brightness, as dictated by Liouville's theorem, lensing does change the apparent solid angle of a source. The amount of magnification is given by the ratio of the image area to the source area. For a circularly symmetric lens, the magnification factor μ is given by
The Microlensing Observations in Astrophysics (MOA) telescope dome at the top of Mount John. Microlensing Observations in Astrophysics (MOA) is a collaborative project between researchers in New Zealand [1] and Japan, [2] led by Professor Yasushi Muraki of Nagoya University. [3]
These arcs or deformations are mirages caused by gravitational lensing of distant galaxies by the massive galaxy cluster located between the observer and the magnified galaxies. [3] [8] This cluster shows an apparent magnitude of +22. In 2002, astronomers used this lensing effect to discover a galaxy, HCM-6A, 12.8 billion light years away from ...
Gravitational lensing is an effect of gravitation, most commonly associated with General relativity. Subcategories. This category has the following 2 subcategories ...