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Curious layman

Scientists bewildered after monster galaxy ‘dies’ without warning

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Burn bright; die young.

Scientists are left scratching their heads after a hugely productive galaxy went dark without warning, according to a new study.

The monstrous star system, known as XMM-2599, reportedly existed 12 billion years ago when the universe was a ripe young 1.8 billion years old, reports SciTech Daily. But researchers at the University Of California in Riverside are bewildered over how the “ultramassive galaxy” could suddenly die.

The study was published in the Astrophysical Journal Letters.(bottom link)

https://nypost.com/2020/02/05/scientists-bewildered-after-monster-galaxy-dies-without-warning/amp/?utm_source=quora&utm_medium=referral

https://iopscience.iop.org/article/10.3847/2041-8213/ab5b9f

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Could this mean that the dimensionless constants were different in the early universe?

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Here are several possibilities, there may be others:-

1/ The emitted photons from the galaxy sources were entirely blocked by something.

2/ The galaxy sources ceased emitting photons.

3/ The depth of field of the observation has moved out of the range to be able collect the emitted photons i.e. observer location has moved out of range.

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Here is the related arxiv article

https://arxiv.org/abs/1910.10158

They give a few reasons in the article the most prominent being virial shocks preventing sufficient cooling of the plasma or the result of a dry merger between galaxies.

On 2/7/2020 at 7:09 PM, QuantumT said:

Could this mean that the dimensionless constants were different in the early universe?

No we would likely be able to detect such through spectography

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Worth clarifying that when they say the galaxy has "died" and "gone dark", neither of those thngs are true

No (or very few) new stars are being formed. The galaxy is still there, still full of stars and still visible.

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11 minutes ago, Strange said:

Worth clarifying that when they say the galaxy has "died" and "gone dark", neither of those thngs are true

No (or very few) new stars are being formed. The galaxy is still there, still full of stars and still visible.

Yeah, but "A Galaxy Died!" is a way better headline.🙄

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