Results 171 to 180 of about 10,420 (207)

Gravitational Lensing in Astronomy. [PDF]

Living Rev Relativ, 1998
Wambsganss J.
europepmc   +1 more source

An Abrupt Change in the Disk Fraction of Free-Floating Planets at the Deuterium-Burning Ignition Limit

Rodrigues T, Bouy H, Raymond S, Martín E, Bertin E, Romero JO, Barrado D, Huélamo N, Tamura M, Roig NM, Galli P, Cuillandre J.   +11 more
europepmc   +1 more source

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Gravitational Microlensing

2017
VCU Theses and ...
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Quasar Variability and Gravitational Microlensing

The Astrophysical Journal, 1997
In this Letter we examine the claim by Baganoff & Malkan that the timescale of brightness variations of quasars increases with decreasing optical wavelength, and that this effect can offset a time dilation effect at high redshift. They base their case on a thin accretion disk model that implies that timescales become shorter as the observed passband ...
M. R. S. Hawkins, A. N. Taylor
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Exoplanet Search Via Gravitational Microlensing

AIP Conference Proceedings, 2009
We review the recent results of the exoplanet search via gravitational microlensing. The microlensing technique is unique and complementary to other methods because it does not rely on the light from the primary. Microlensing is sensitive to small‐size planets down to those of Earth mass around dim M‐dwarfs.
Takahiro Sumi, Tomonori Usuda, Motohide Tamura, Miki Ishii   +3 more
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Gravitational Microlensing: Current Issues

2003
We briefly review four major issues currently being debated in observations of gravitational microlensing within the Local Group. Microlensing in the Galaxy has established that the baryonic denizens of the dark halo do not contribute significantly to its mass budget.
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Exoplanet searches with gravitational microlensing

2010
Different regimes of gravitational lensing depend on lens masses and roughly correspond to angular distance between images. If a gravitational lens has a typical stellar mass, this regime is named microlensing because the typical angular distance between images is about microarcseconds in the case for sources and lenses at cosmological distances.
A. F. Zakharov, S. Calchi Novati, DE PAOLIS, Francesco, INGROSSO, Gabriele, NUCITA, Achille, P.h. Jetzer   +5 more
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Morse theory and gravitational microlensing

Journal of Mathematical Physics, 1992
Morse theory is used to rigorously obtain counting formulas and lower bounds for the total number of images of a background point source, not on a caustic, undergoing lensing by a single-plane microlens system having compact bodies plus either subcritical or supercritical continuously distributed matter.
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Gravitational microlensing

Physics World, 1993
Bohdan Paczynński, Joachim Wambsganss
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