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Testing General Relativity with the Shadow Size of Sgr A*

Journal Article

In general relativity, the angular radius of the shadow of a black holeis primarily determined by its mass-to-distance ratio and depends onlyweakly on its spin and inclination. If general relativity is violated,however, the shadow size may also depend...

Testing General Relativity with Accretion-Flow Imaging of Sgr A$^*$

Journal Article

Seeing the Unseeable

Journal Article

The Event Horizon Telescope, an Earth-sized interferometer, aims to capture an image of a black hole's event horizon to test the theory of general relativity and probe accretion processes.

First M87 Event Horizon Telescope Results. V. Physical Origin of the Asymmetric Ring

Journal Article

The Event Horizon Telescope (EHT) has mapped the central compact radio source of the elliptical galaxy M87 at 1.3 mm with unprecedented angular resolution. Here we consider the physical implications of the asymmetric ring seen in the 2017 EHT data. To...

Time Domain Filtering of Resolved Images of SgrA*

Journal Article

The goal of the Event Horizon Telescope (EHT) is to provide spatially resolved images of Sgr A*, the source associated with the Galactic Center black hole. Because Sgr A* varies on timescales short compared to an EHT observing campaign, it is interesting...

Using VLBI to Probe the Orion KL Outflow on AU Scales

Journal Article

We present the first contemporaneous 43 and 86 GHz VLBI images of thev=1, J=2-->1 and J=1-->0 SiO masers in the Orion KL nebula. Bothmaser species exhibit the same general morphology of earlier J=1-->0maser images, which appear to trace the edges of a...

Imaging the Supermassive Black Hole Shadow and Jet Base of M87 with the Event Horizon Telescope

Journal Article

The Event Horizon Telescope (EHT) is a project to assemble a Very LongBaseline Interferometry (VLBI) network of millimeter wavelength dishesthat can resolve strong field general relativistic signatures near asupermassive black hole. As planned, the EHT...

First M87 Event Horizon Telescope Results. I. The Shadow of the Supermassive Black Hole

Journal Article

When surrounded by a transparent emission region, black holes are expected to reveal a dark shadow caused by gravitational light bending and photon capture at the event horizon. To image and study this phenomenon, we have assembled the Event Horizon...

How a global network of telescopes may give us first glimpse of a black hole

News

"Even though black holes are vital to our understanding of the universe, no one has ever seen one -- yet. To change this, a team of scientists in northern Chile, is using a network of telescopes around the globe to capture an image of a black hole for the...

First M87 Event Horizon Telescope Results. VI. The Shadow and Mass of the Central Black Hole

Journal Article

We present measurements of the properties of the central radio source in M87 using Event Horizon Telescope data obtained during the 2017 campaign. We develop and fit geometric crescent models (asymmetric rings with interior brightness depressions) using...

Efficient Imaging Strategies For Next-Generation Radio Arrays

Journal Article

The performance goals of the Square Kilometre Array (SKA) are such thatmajor departures from prior practice for imaging interferometer arraysare required. One class of solutions involves the construction of largenumbers of stations, each composed of one...

EHT Panel Selected for SXSW in March 2019

News

Predicted almost a century ago by Einstein’s Theory of General Relativity, black holes not only exist, but actually power some of the most extreme phenomena in the Universe. The Event Horizon Telescope (EHT) is a global effort to construct an Earth-sized...