"Artist's impression of the expected dark matter distribution around the Milky Way" by ESO/L. Calçada / CC BY 4.0

There’s a Strange Glow in The Centre of Our Galaxy, And It’s Not What We Thought It Was

Aug 28, 2020

By Michelle Starr

The centre of the Milky Way is glowing. Yes, there’s a big chonkin’ black hole there, and it’s a very energetic region, but there’s an additional high-energy, gamma-ray glow, above and beyond the activity we know about, and it’s something that’s yet to be explained.

This glow is called the Galactic Center GeV Excess (GCE), and astronomers have been trying to figure it out for years. One hotly debated explanation is that the glow might theoretically be produced by the annihilation of dark matter – but new research is a nail in that idea’s coffin.

In a series of exhaustive models that include recent developments in simulating the galactic bulge and other sources of gamma-ray emission in the galactic centre, a team of astrophysicists have ruled out dark matter annihilation as the source of the glow.

This finding, the team says, gives dark matter less room to hide – placing stronger constraints on its properties that could aid in future searches.

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2 comments on “There’s a Strange Glow in The Centre of Our Galaxy, And It’s Not What We Thought It Was

  • I recently read “Brief Answers to the Big Questions”, by Stephen Hawking.  It was a typical Hawking book — he has an excellent sense of communicative language.  Anyway, I was caught by one of the chapters and thought about the content for days after reading it.

     

    The concept flows something like this:

    The second law informs us that the overall entropy of a closed system tends towards disorder.  So, the total amount of entropy increases over time.  Nothing to see here, I’ve heard this very very often.

    But, this is a “total” amount of disorder; it does not drill down to individual systems within the universe, which can tend towards order provided the amount of disorder in it’s surroundings increases by a greater amount.  Again, got it — nothing new, yet.

     

    So if life is involved in the business of using energy to maintain order, the universe, to accommodate must increase in disorder so that the whole endeavor stays “balanced”.  In order to do that, the universe expands.  Everywhere in the universe where order is being generated becomes the driving force of the expansion of the universe.  The sum must be zero — and disorder requires “more room” … new concept for me.

     

    Perhaps gravity is the tension between order and disorder.  The order generators; living things, stars….. are causing the expansion of the universe and that expansion necessitates time, because the universe is not expanding into a “bigger container”, but rather, into the future.  So, could these high energy discharge places be “leaks” in the system?  Places where the system gets even by generation of energy?

     

    I feel like Donald Southerland in Animal House but this is about as cosmic as my thoughts get!


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  • The order generators; living things, stars….. are causing the expansion of the universe and that expansion necessitates time, because the universe is not expanding into a “bigger container”, but rather, into the future.

    when you look at the stars and galaxies

    are you looking through the past into the future?


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