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Two New Giant Radio Galaxies Discovered

Dragon
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Two New Giant Radio Galaxies Discovered Empty Two New Giant Radio Galaxies Discovered

Post by Dragon Fri Jan 22, 2021 3:26 pm

Astronomers using the MeerKAT radio telescope at the South African Radio Astronomy Observatory in Cape Town, South Africa, have discovered two new radio galaxies with sizes of more than 6.5 million light-years, or 62 times larger than the Milky Way.

Some classes of active galactic nuclei have jets of relativistic plasma and particles emanating from the central region, which produce radio emission.

In some cases, these jets propagate to extremely large distances beyond the host galaxy and into the intergalactic medium.

When the projected size of these jets and lobes exceeds 2.3 million light-years, such systems are referred to as giant radio galaxies.

These galaxies are the largest individual objects in the Universe.

The largest known has a projected size of 15.9 million light-years, though the majority of known giant radio galaxies are below 6.5 million light-years in extent.

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Two New Giant Radio Galaxies Discovered 334pu7m
Dragon
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Post by Dragon Fri Jan 22, 2021 3:27 pm

Two New Giant Radio Galaxies Discovered Image_9266_1-Giant-Radio-Galaxy

Image credit: I. Heywood, University of Oxford / Rhodes University / South African Radio Astronomy Observatory / CC BY 4.0.

This image shows the giant radio galaxy MGTC J095959.63+024608.6; in the background is the sky as seen in optical light; overlaid in red is the radio light from the giant radio galaxy, as seen by MeerKAT.

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Two New Giant Radio Galaxies Discovered 334pu7m
Dragon
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Post by Dragon Fri Jan 22, 2021 3:29 pm

Two New Giant Radio Galaxies Discovered Image_9266_2-Giant-Radio-Galaxy
Image credit: I. Heywood, University of Oxford / Rhodes University / South African Radio Astronomy Observatory / CC BY 4.0.

This image shows the giant radio galaxy MGTC J100016.84+015133.0; in the background is the sky as seen in optical light; overlaid in red is the radio light from the giant radio galaxy, as seen by MeerKAT.

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Two New Giant Radio Galaxies Discovered 334pu7m
Dragon
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Post by Dragon Fri Jan 22, 2021 3:30 pm



Astronomers in NASA have detected unusually bright radio signal from the space in April 2020. This is what astrophysicists call a fast radio burst.

Until now these FRBs were seen coming from outside our galaxy but this was the first time it has been detected in our own galaxy.


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