Thursday, May 9, 2024

4462 - GALAXY BLACKHOLE - reveals magnetic fields?

 

-    4462  -  GALAXY  BLACKHOLE  -  reveals magnetic fields?     A new view reveals magnetic fields around our galaxy’s giant blackhole.   Imagery from the 'Event Horizon Telescope' (EHT) traces the lines of powerful magnetic fields spiraling out from the edge of the supermassive black hole at the center of our Milky Way galaxy, and suggests that strong magnetism may be common to all supermassive black holes.

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--------------------------  4462    -     GALAXY  BLACKHOLE  -  reveals magnetic fields?

-    The newly released image shows the surroundings of the black hole known as Sagittarius A*,  which is about 27,000 light-years from Earth.    Back in 2019, astronomers showed off a similar picture of the supermassive black hole at the center of the galaxy M87, which is more than a thousand times bigger and farther away than the Milky Way’s black hole.

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-   In 2021, the EHT charted the magnetic field lines around M87’s black hole by taking a close look at the black hole in polarized light, which reflects the patterns of particles whirling around magnetic field lines. Researchers used the same technique to determine the magnetic signature of Sagittarius A*, or Sgr A*.

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-   The EHT team had to combine multiple views to produce a composite image.  What we’re seeing now is that there are strong, twisted and organized magnetic fields near the black hole at the center of the Milky Way galaxy.

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-   Along with Sgr A* having a strikingly similar polarization structure to that seen in the much larger and more powerful M87* black hole, we’ve learned that strong and ordered magnetic fields are critical to how black holes interact with the gas and matter around them.

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-   The structure of the magnetic fields around Sgr A* suggests that the black hole is launching a jet of material into the surrounding environment.  The fact that the magnetic field structure of M87* is so similar to that of Sgr A* is significant because it suggests that the physical processes that govern how a black hole feeds and launches a jet might be universal among supermassive black holes, despite differences in mass, size and surrounding environment.

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-    The EHT team plans to observe Sgr A* again in the years ahead, the researchers aim to produce high-fidelity movies of Sgr A* that may reveal a hidden jet. They’ll also look for evidence of similar polarization features around other supermassive black holes.

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-    Oldest 'dead' galaxy ever seen defies current models of the ancient universe.   This galaxy stopped forming stars more than 13 billion years ago.   This is the oldest known "dead" galaxy in recent observations from the James Webb Space Telescope (JWST). This galaxy even appears to challenge current models of the early universe.

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-  The newly discovered galaxy,  “JADES-GS-z7-01-QU”, stopped forming stars more than 13 billion years ago, when the universe was only 700 million years old. However, astronomers are puzzled by the galaxy's sudden halt in star formation because, at that time, the dust and gas necessary to form stars was abundant in the universe.   The first few hundred million years of the universe was a very active phase, with lots of gas clouds collapsing to form new stars.

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-    Data from the JWST “Advanced Deep Survey” (JADES) shows that the galaxy most likely had a quick burst of star formation that lasted between 30 million to 90 million years, and then stopped suddenly between 10 million and 20 million years before the point in time observed by the JWST.

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-   Dead galaxies that no longer form stars have been observed in the early universe before, But JADES-GS-z7-01-QU is the oldest such galaxy yet recorded at only 700 million years after the Big Bang that formed the universe 13.8 billion years ago. It is also much smaller than other dormant galaxies previously observed in the early universe.   JWST's improved sensitivity can detect smaller and fainter galaxies.

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-  These recent observations of JADES-GS-z7-01-QU are the deepest views into the distant universe made to date. The rapid burst of star formation observed in the galaxy may have exhausted the galaxy's reservoir of dust and gas from which new stars are formed.

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-    Given astronomers are still unsure why exactly the galaxy's star formation stopped, or, if the galaxy ever came back to life, they plan to find a greater number of old galaxies to help piece together galactic evolution in the early universe and create more accurate models of that time period.

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May 8, 2024               GALAXY  BLACKHOLE  -  reveals magnetic fields?            4462

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