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So they hypothesize it either collapsed to a black hole without supernova or stopped fusion. They don't mention it might just might have been swallowed by black

So they hypothesize it either collapsed to a black hole without supernova or stopped fusion. They don't mention it might just might have been swallowed by black hole.

xorfish 6y ago
Wouldn't that be a slow process?
- Jolter 6y ago
  That is my impression also. Stars/objects being swallowed by black holes tend to emit a large amount of radiation as it happens, over longer periods. Someone correct me if I'm wrong.
  - saiya-jin 6y ago
    Maybe stupid question - what would happen to the star, if it actually 'collided' with black hole - ie black hole flew right through its core, not just casually going nearby, trapping each other and black hole slowly sucking it dry? I would expect the thing to be over rather swiftly, albeit probably with some accretion disc still generating some radiation.
    - kijin 6y ago
      A head-on collision with a black hole will likely produce a very noticeable explosion. Black holes don't just vacuum up all the matter around them silently. Any matter falling into a black hole, not just the accretion disk, emits radiation. This radiation causes surrounding matter to expand outward, counteracting the gravity of the black hole. A black hole trying to eat an entire star at once will quickly exceed its Eddington limit [1] and most of the remaining matter will be blown away. [1] https://en.wikipedia.org/wiki/Eddington_luminosity https://en.wikipedia.org/wiki/Eddington_luminosity
    - rini17 6y ago
      Before the actual head-on collision the star would be spaghettified(that's actual term, see below) by the black hole's gravity and that... is not a silent process, with exception of supermassive black holes. https://en.wikipedia.org/wiki/Spaghettification https://en.wikipedia.org/wiki/Spaghettification
- dredmorbius 6y ago
  Slow and exothermic. A star would be unlikely to directly enter an event horizon but would instead orbit the black hole (with resulting doppler-shift accelerations detectable on Earth via spectral analysis), and strong emissions from IR to x-ray frequencies as matter was ripped from the star by tidal forces and drawn into the event horizon.

So they hypothesize it either collapsed to a black hole without supernova or stopped fusion. They don't mention it might just might have been swallowed by black hole.

xorfish 6y ago

Wouldn't that be a slow process?

Jolter 6y ago
That is my impression also. Stars/objects being swallowed by black holes tend to emit a large amount of radiation as it happens, over longer periods. Someone correct me if I'm wrong.
- saiya-jin 6y ago
  Maybe stupid question - what would happen to the star, if it actually 'collided' with black hole - ie black hole flew right through its core, not just casually going nearby, trapping each other and black hole slowly sucking it dry? I would expect the thing to be over rather swiftly, albeit probably with some accretion disc still generating some radiation.
  - kijin 6y ago
    A head-on collision with a black hole will likely produce a very noticeable explosion. Black holes don't just vacuum up all the matter around them silently. Any matter falling into a black hole, not just the accretion disk, emits radiation. This radiation causes surrounding matter to expand outward, counteracting the gravity of the black hole. A black hole trying to eat an entire star at once will quickly exceed its Eddington limit [1] and most of the remaining matter will be blown away. [1] https://en.wikipedia.org/wiki/Eddington_luminosity https://en.wikipedia.org/wiki/Eddington_luminosity
  - rini17 6y ago
    Before the actual head-on collision the star would be spaghettified(that's actual term, see below) by the black hole's gravity and that... is not a silent process, with exception of supermassive black holes. https://en.wikipedia.org/wiki/Spaghettification https://en.wikipedia.org/wiki/Spaghettification
dredmorbius 6y ago
Slow and exothermic. A star would be unlikely to directly enter an event horizon but would instead orbit the black hole (with resulting doppler-shift accelerations detectable on Earth via spectral analysis), and strong emissions from IR to x-ray frequencies as matter was ripped from the star by tidal forces and drawn into the event horizon.