- 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.
-
-------------------------- 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.
-
- 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*.
-
- 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.
-
- 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.
-
- 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.
-
- 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.
-
- 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.
-
- 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.
-
- 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.
-
- 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.
-
- 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.
-
- 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.
-
-
May 8, 2024 GALAXY BLACKHOLE
- reveals magnetic fields? 4462
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--------------------- --- Thursday, May 9, 2024
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