Jump to content

Stars_Banner.jpg.843f9de1cf2bdcd4b91ede4312ecf0ca.jpg

Huge gamma ray burst.....One of the biggest ever


Recommended Posts

It does James between the plough and Leo, really will placed. There one thing I don't understand, the burst is so far away I thought it takes years for the visible event to reach us. So how can they say it's just a matter of weeks? Or am I missing something?

Sent from my GT-I9300 using Tapatalk 2

Link to comment
Share on other sites

The gamma rays should take exactly the same amount of time to reach us as the visible light. I wonder if the reason it isn't visible at the moment is that something is blocking the less energetic radiation. I'm really not sure about that. I did wonder when reading the article. If the source is 3.6bn light years away then the (assumed) supernova happened 3.6bn years ago. All the electromagnetic radiation should be reaching us now, be it gamma, X-ray, UV, visible or IR.

James

Link to comment
Share on other sites

There one thing I don't understand, the burst is so far away I thought it takes years for the visible event to reach us. So how can they say it's just a matter of weeks? Or am I missing something?

I'm a bit rusty and it's years since I read much astrophysics, but...

The gamma rays are released by the nuclear/quantum events happening in the stars collapsing core. That is where the supernova event takes place.

The core collapses but we don't see it immediately because it's obscured by the outer layers of the star. As the intense radiation propagates through the outer layers of the star they are subsequently heated to staggeringly high temperatures and are blasted off into space.

It's the super heated gas/plasma of the outer layers that we see as the supernova.

As they expand through space they cool and eventually leave the kind of remnant we observe at the location of known historical supernovae such as the crab nebula.

So right now at the site of this GRB the progenitor star is being torn apart from the inside but it takes time...

I read somewhere once that the outer layers of our sun are heated by nuclear reactions that took place tens (hundreds?) of years ago. It take a long time for radiation and convection to transport the energy to the surface.

Link to comment
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share

×
×
  • Create New...

Important Information

We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue. By using this site, you agree to our Terms of Use.