#zone of avoidance

[zespaceblog]

In The Final Dying Moments

When you're interest extends to astronomy, you quickly realise that in almost every area, we have learned so much, yet are still so far off from certainties.

One area this very much extends to is core collapse. We know a fair amount about the process, we know gravity eventually win's over as fusion in the core falters through increased content of Iron, but in all our attempts to actually model it, it's clear we're missing part of the puzzle.

above, a computer simulation of the inside of a star as it collapses

The problem is, as the core collapses, and gravity crushes down, the rest of the star falls inwards too, and a shockwave moves outwards. We known part of the process that moves a star from main sequence to red giant is that the shockwave pulls in enough fusible material for the star to continue on. In order for a supernova to really occur (or at least, so the theory goes), the shockwave needs to push out beyond the star's atmosphere, but in almost all models, it never does.

The conclusion is, we're clearly missing a bit of the puzzle, and one of the possible causes is that in the final collapse, the shockwave has much more energy than we're assuming, and neutrino's may hold the key to explaining it.

The last nearby supernova was in 1987(although not in the Milky Way itself, in the LMC), when only a handful of neutrino detectors existed, and they were able to capture a few that coincided with sn1987a, but not nearly enough. Today we have many more, but our Milky Way seems reluctant to share a nearby supernova with us, being long overdue for it.

It's quite possible that we actually have had several since the last in the Milky Way (SN1604), but they occurred within what Edwin Hubble coined the zone of avoidance, effectively behind the galaxy centre, meaning we may have missed it due to the dust and gas obscuring our view of it, from this side of the galaxy.

Still, eventually it will happen, and our ability to capture these neutrino's may point to the missing part of our understanding.

Source:

Supernova neutrinos could break physics – if we can make sense of them

Neutrinos produced inside an exploding star could betray exotic particles that would lead to a deeper theory of physics. Will our detectors

[blasteffect]

"zone of avoidance"

This phantom region, known as the zone of avoidance, is a blank spot on our map of the universe, comprising somewhere between 10% and 20% of the night sky. The reason we can't see it — at least with standard visible light telescopes — is because the Milky Way's bulging center blocks our view of it; the center of our galaxy is so dense with stars, dust and other matter that light from the zone of avoidance gets scattered or absorbed before reaching Earth's telescopes.

However, researchers have had better luck uncovering the zone's secrets with telescopes that can detect infrared radiation — a type of energy that's invisible to human eyes, but powerful enough to shine through dense clouds of gas and dust. Infrared surveys of the zone of avoidance have found evidence of thousands of individual galaxies shining through the cosmic fog, though little is known about the large-scale structures that lurk there.

Now, researchers have combined data from several of those infrared surveys to reveal the most colossal structure ever detected in the zone of avoidance, according to a study published Oct. 28 on the preprint database arXiv.org. (This study has not yet been peer reviewed, though it has been submitted for review to the journal Astronomy and Astrophysics).

Located approximately 3 billion light-years from Earth, the mysterious structure appears to be a large cluster of galaxies drawn together by a shared center of gravity. Using observations from the VVV Survey — a survey that studies the Milky Way's central bulge at infrared wavelengths using the Visible and Infrared Survey Telescope for Astronomy in Chile — the study authors found evidence of at least 58 galaxies bundled together in a small plot of the zone of avoidance.

Galaxy clusters are the largest gravitationally-bound objects in the universe; the largest known clusters contain hundreds of thousands of galaxies bunched together. Unfortunately, it's impossible to tell just how wide or massive the newly discovered cluster is, given the vast distances and myriad obstructions sitting between the cluster's stars and Earth.

However, the mere detection of this colossal object shows that the zone of avoidance may not be as inscrutable as was once thought. Future infrared studies — including potential observations by the James Webb Space Telescope, which has already used its infrared camera to take the deepest image of the universe to date — should further help scientists unlock the hidden secrets beyond the Milky Way's bulge.

Courtesy: Physics Astronomy

[merelygifted]

Scientists discover massive 'extragalactic structure' behind the Milky Way | Live Science

An uncharted region of space known as the "zone of avoidance" lurks behind the Milky Way's center – and astronomers just found an enormous, multi-galaxy structure there

Astronomers have detected an enormous extragalactic structure hiding in an uncharted region of space far beyond the Milky Way's center.

This phantom region, known as the zone of avoidance, is a blank spot on our map of the universe, comprising somewhere between 10% and 20% of the night sky. The reason we can't see it — at least with standard visible light telescopes — is because the Milky Way's bulging center blocks our view of it; the center of our galaxy is so dense with stars, dust and other matter that light from the zone of avoidance gets scattered or absorbed before reaching Earth's telescopes.

However, researchers have had better luck uncovering the zone's secrets with telescopes that can detect infrared radiation — a type of energy that's invisible to human eyes, but powerful enough to shine through dense clouds of gas and dust. Infrared surveys of the zone of avoidance have found evidence of thousands of individual galaxies shining through the cosmic fog, though little is known about the large-scale structures that lurk there.

Now, researchers have combined data from several of those infrared surveys to reveal the most colossal structure ever detected in the zone of avoidance, according to a study published Oct. 28 on the preprint database arXiv.org. (This study has not yet been peer reviewed, though it has been submitted for review to the journal Astronomy and Astrophysics).

Located approximately 3 billion light-years from Earth, the mysterious structure appears to be a large cluster of galaxies drawn together by a shared center of gravity. Using observations from the VVV Survey — a survey that studies the Milky Way's central bulge at infrared wavelengths using the Visible and Infrared Survey Telescope for Astronomy in Chile — the study authors found evidence of at least 58 galaxies bundled together in a small plot of the zone of avoidance.  ...

[typhlonectes]

A Hidden Supercluster Could Solve the Mystery of the Milky Way

Astronomers generally stay away from the “Zone of Avoidance.” When one astronomer didn’t, she found a giant cosmic structure that could help explain why our galaxy moves so fast.

Glance at the night sky from a clear vantage point, and the thick band of the Milky Way will slash across the sky.

But the stars and dust that paint our galaxy’s disk are an unwelcome sight to astronomers who study all the galaxies that lie beyond our own. It’s like a thick stripe of fog across a windshield, a blur that renders our knowledge of the greater universe incomplete.

Astronomers call it the Zone of Avoidance.

Renée Kraan-Korteweg has spent her career trying to uncover what lies beyond the zone. She first caught a whiff of something spectacular in the background when, in the 1980s, she found hints of a potential cluster of objects on old photographic survey plates. Over the next few decades, the hints of a large-scale structure kept coming.

Late last year, Kraan-Korteweg and colleagues announced that they had discovered an enormous cosmic structure: a “supercluster” of thousands upon thousands of galaxies.

The collection spans 300 million light years, stretching both above and below the galactic plane like an ogre hiding behind a lamppost. The astronomers call it the Vela Supercluster, for its approximate position around the constellation Vela...

[basiltheratatouille]

Zone of Avoidance - Wikipedia

[ajourneythroughtime]

"Enormous Ghost Galaxy" --Hidden In the Milky Way's 'Zone of Avoidance' (Weekend Feature) | The Daily Galaxy

An enormous ‘ghost’ galaxy, Antlia 2, believed to be one of the oldest dwarf galaxies in the universe, was detected lurking on the outskirts of the Milky Way in new data from the ESA’s Gaia satellite.

It’s incognito, but we know what it’s doing, but science is always changing, but so are the partial truths in this sea of thieves

[oldpoet56]

“Enormous Ghost Galaxy” –Hidden In the Milky Way's ‘Zone of Avoidance’

“Enormous Ghost Galaxy” –Hidden In the Milky Way’s ‘Zone of Avoidance’

(THIS ARTICLE IS COURTESY OF THE DAILY GALAXY)

  “Enormous Ghost Galaxy” –Hidden In the Milky Way’s ‘Zone of Avoidance’ (Weekend Feature) Posted on May 18, 2019

  An enormous ‘ghost’ galaxy, believed to be one of the oldest in the universe, was detected lurking on the outskirts of the Milky Way in November of 2018 by a team of astronomers who discovered the massive object when trawling through…

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[bizarrobrain]

"Carrier Signal" by ASC - From "Zone of Avoidance" (2017)