gravitational lensing

This tag is associated with 25 posts

Kepler Discovers a Self-Lensing Star System

Kepler finds the signature of a transiting white dwarf. Instead blocking the light of its companion star, the white dwarf magnifies it, creating a light curve that periodically brightens.

From nuisance to new science: gravitational lensing of supernovae

There might be more information in the Hubble diagram of supernovae than we first thought. Far away supernovae are subject to gravitational lensing and in the upcoming decades, they could be used to determine how much matter there is in the Universe and how it clusters.

Where is that galaxy pointing?

Gravitational lensing is the deflection of the trajectory of a photon by gravity, and it is a natural consequence of the theory of General Relativity. Lensing distorts the shapes and orientations of galaxies and in today’s post, we discuss a new method to reconstruct dark matter maps of our Universe using the position angles of galaxies.

Dark in the Lightness

New results from stacked weak lensing measurements of over a hundred thousand galaxies show that, on large scales, light from stars appears to trace the dark matter distribution of the Universe remarkably well.

What’s Next For Kepler?

NASA is looking for a new mission for the damaged Kepler space telescope. Here are some ideas.

HST Observations

Do Elliptical Galaxies Have Dark Matter Halos?

Based on galactic rotation curves, we think that spiral galaxies are embedded in massive dark matter halos. Is the same true for elliptical galaxies? Magain and Chantry use gravitational lensing to measure the mass-to-light ratios in 15 elliptical galaxies, and the results might surprise you!

An almost perfect Universe: the Planck 2013 release (II)

In today’s astrobite, we continue our overview of the papers from the Planck 2013 release. This time, we review papers XVII and XXIII, which discuss weak gravitational lensing of the Cosmic Microwave Background, and the isotropy of the Universe at the time this background radiation was emitted.

Simulations of Dark matter core formation

The Top 12 of 2012

What were astronomers reading and talking about in their research last year? Check out figures from the top 12 most-cited astronomy papers from 2012 (so far) and find out what researchers were up to and why!

The strength of weak lensing

The Canada-France Hawaii Telescope weak gravitational lensing survey (CFHTLens), recently released new results to help constrain our cosmological models. While still in its early stages, weak lensing will ultimately be a powerful tool to discover the nature of the mysterious dark energy.

Using a Lens to Look Back in Time

Using massive gravitational lenses can help us study the evolution of galaxies over unprecedented time scales.

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