Neutron Star

Jul 27, 2021
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Neutron stars are among the densest objects in the Universe. They have a radius of 10-20 km but carry a weight up to 2.5 times the mass of the Sun.
A neutron star is the collapsed core of a star. They are formed when the core pressure exceeds the Chandrasekhar limit of about 1.4 solar masses. The electron degeneracy pressure is exceeded which forces protons and electrons to combine to form neutrons.

In its dying phase, when a star with a core containing mainly iron exhausts all its fuel, it collapses under gravity and explodes as a supernova. The extreme high pressure causes protons and electrons to combine into neutrons forming a neutron star. The energy released in the process blows away the outer layers of the star.
 
Feb 3, 2020
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So, I'd like to explore the transition from a neutron star to a black hole. I wonder how something with a radius of appx. 20 km becomes as big as Sagittarius A, serving as the center of the milky way galaxy? Perhaps this was a large neutron star. It seems a giant leap from neutron star to super massive black hole. I wonder about the process and time required. Any thoughts?
 

IG2007

"Don't criticize what you can't understand..."
Apr 5, 2020
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It seems a giant leap from neutron star to super massive black hole. I wonder about the process and time required. Any thoughts?
That's a good question that intrigues even modern-day astrophysicists. No one really knows how supermassive blackholes are formed. That's still a question. :)
 
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Jul 27, 2021
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That's a good question that intrigues even modern-day astrophysicists. No one really knows how supermassive blackholes are formed. That's still a question. :)
Unresolved, yes.

A difference between them is that a neutron star would be having a hard surface unlike that of a black hole. One of the current findings/opinion is the signature of the lack of a hard-surface. A black whole is considered as a singularity, having a determined horizon, where it's gravity comes to the black whole matter. With such a signature, we can distinguish between a neutron star and a black hole as neutron stars release emissions from the hard-surface.
 

Catastrophe

The devil is in the detail
Feb 18, 2020
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Select the above also ^^^^^^^^^^^^

View: https://imgur.com/a/SMdtB0o


Formation of supermassive black holes by direct collapse in ...
https://academic.oup.com › mnras › article


by MC Begelman · 2006 · Cited by 758 — Continued compression by infalling matter prevents the core from losing energy radiatively and collapsing or becoming degenerate. At sufficiently high ...
INTRODUCTION · ‎CORE COLLAPSE AND INITIAL GROWTH OF BLACK HOLE


Supermassive Black Hole | COSMOS
https://astronomy.swin.edu.au › cosmos › supermassive...

Astronomers are still not sure how these supermassive black holes form. Stellar black holes result from the collapse of massive stars, and some have suggested ...

Formation of Supermassive Black Holes
https://arxiv.org › astro-ph

by M Volonteri · 2010 · Cited by 686 — I will discuss black hole formation processes for `seed' black holes that are likely to place at early cosmic epochs, and possible ...

Zeroing In on How Supermassive Black Holes Formed ...
https://www.scientificamerican.com › article › zeroing-i...

29 Sept 2017 — Recent observations have revealed the existence of black holes billions of times more massive than the sun just 800 million years after the big ...

New Origin of Supermassive Black Holes Revealed by ...
https://scitechdaily.com › new-origin-of-supermassive-bla...


However, their origin is still one of the great mysteries of astronomy. A popular theory is the direct collapse model where primordial clouds of ...
19 Jun 2020 · Uploaded by SciTech Daily

How do supermassive black holes grow so large? | Astronomy ...
https://astronomy.com › how-to-grow-a-giant-black-hole

22 Mar 2021 — First, massive stars live out their life cycles, creating many smaller black holes. As these black holes plow through the dense gas within their ...

How did supermassive black holes get so big and chonky ...
https://www.space.com › how-supermassive-black-holes-g...


Computer simulations of the behavior of stars, black holes, galaxies and gas in the early universe suggest that these black holes grew quickly, ...
9 Apr 2020

Where Do Supermassive Black Holes Come From? | WIRED
https://www.wired.com › Science › black holes

18 Jul 2019 — Astronomers have a pretty good idea of how most black holes form: A massive star dies, and after it goes supernova, the remaining mass (if ...


Cat :)
 
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Neutron “stars” (they aren’t stars) can produce bursts that are the brightest objects in the galaxy in total energy flux. [ They do need a better name. :)]

Magnetars are neutron “stars”. Their matter transitions constantly between neutrons and protons, plus other particles. This creates huge EM fields.
 

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