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    Event Horizon Telescope tagged posts

    Astrophysicists use Echoes of Light to Illuminate Black Holes

    November 8, 2024, Categories  Uncategorized

    Astrophysicists Use Echoes of Light to Illuminate Black Holes
    Due to gravitational lensing, the photons from a single flash of light near a black hole follow winding paths. Some follow the trajectory of the blue line, where they take a direct path to the observer. Others orbit around the black hole once, following the path of the red dashed line. Others still orbit the black hole twice following the green dashed line. Because the different paths all have different time delays, the photons arrive one after another in sequence, and the original flash of light will appear to echo. Credit: George N. Wong

    A team of astrophysicists, led by scholars from the Institute for Advanced Study, has developed an innovative technique to search for black hole light echoes...

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    Cosmic Simulation Reveals How Black Holes Grow and Evolve

    July 5, 2024, Categories  Astronomy/Space

    This still shows an accretion disk around a supermassive black hole.
    This still from the simulation shows a supermassive black hole, or quasar, surrounded by a swirling disk of material called an accretion disk. Credit: Caltech/Phil Hopkins group

    A team of astrophysicists led by Caltech has managed for the first time to simulate the journey of primordial gas dating from the early universe to the stage at which it becomes swept up in a disk of material fueling a single supermassive black hole. The new computer simulation upends ideas about such disks that astronomers have held since the 1970s and paves the way for new discoveries about how black holes and galaxies grow and evolve.

    “Our new simulation marks the culmination of several years of work from two large collaborations started here at Caltech,” says Phil Hopkins, the Ira S...

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    Innovative Model provides insight into the Behavior of the Black Hole at the center of our galaxy

    June 14, 2020, Categories  Astronomy/Space

    Innovative Model provides insight into the Behavior of the Black Hole at the center of our galaxy

    Like most galaxies, the Milky Way hosts a supermassive black hole at its center. Called Sagittarius A*, the object has captured astronomers’ curiosity for decades. And now there is an effort to image it directly.

    Catching a good photo of the celestial beast will require a better understanding of what’s going on around it, which has proved challenging due to the vastly different scales involved...

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    Telescopes in Space for even Sharper Images of Black Holes

    May 7, 2019, Categories  Astronomy/Space

    In space, the EHI has a resolution more than five times that of the EHT on Earth, and images can be reconstructed with higher fidelity. Top left: Model of Sagittarius A* at an observation frequency of 230 GHz. Top left: Simulation of an image of this model with the EHT. Bottom left: Model of Sagittarius A* at an observation frequency of 690 GHz. Bottom right: Simulation of an image of this model with the EHI.
    Credit: F. Roelofs and M. Moscibrodzka, Radboud University

    Astronomers propose placing two or three satellites in circular orbit around the Earth to observe black holes. Astronomers have just managed to take the first image of a black hole, and now the next challenge facing them is how to take even sharper images, so that Einstein’s Theory of General Relativity can be tested...

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