GRB

[pooria]

In the name of God
The compassionate the merciful

Hello to everyone
I have two questions about GRBs (Gamma ray bursts).
Why they happen? and is there any relation between GRBs and Magnetars.
Please if you know the answers write them for me.




Thank you very much

pooria :

[antoniseb]

Originally posted by pooria@Jun 15 2005, 04:32 PM
Why they happen? and is there any relation between GRBs and Magnetars.

Hi Pooria, welcome to the UT forum,

It seems strange that you know of Magnetars, but haven't read enough to have some idea what GRBs are.

We do not know with certainty what GRBs are, but we do know that there are at least two very distinct kinds. One type is probably from hypernovas, in which a very massive old star collapses forming a new black hole, and the other may be from the merging of a neutron star with another neutron star or black hole. It may be that some GRBs are in fact bursts from Magnetars.
I hope this helps.

[pooria]

(( We are from God to him we shall return ))


appreciation
Thanks for your answer.
could you please tell me more about the strong magnetic field of these stars.

pooria

[pooria]

* God is the real owner of Universe*
As the last question of this topic could any one introduce me some books about
the astrophysics and strange stars like supernovas,......


thank you very much
pooria

[tyrie2001]

The link below has some info on GRB's that you may find interesting, it basically states what they are and what probably causes them. It also explains how GRB's have been put forward as a possible solution to the Fermi Paradox.

http://www.daviddarling.info/encyclopedia/...gammaburst.html

And this link has some info on Magentars.

http://www.daviddarling.info/encyclopedia/...M/magnetar.html

And this link lists some books on astrophysics, astronomy and astrobiology.

http://www.daviddarling.info/bookshop/entrance.html

[aeolus]

Hey pooria, it's cool to see you're so interested in the topic. GRB are definately an exciting topic.

You might want to read the rules for the forum, though, since there seems to be a trend developing in your posts. We like to discuss science here, but try to stay away from religion and politics, since that stuff can cause people to get nasty towards each other. If posts get too controversial, the moderators will mostl likely edit or delete them.

See you on the forum.

[ziggwarth]

I've always read that gamma ray bursts may come from hypernovas, neutron stars colliding with other neutron stars or a black hole (basically what antoniseb said).

But what about a black hole colliding with another black hole? Could that also be a source for gamma ray bursts?

[antoniseb]

Originally posted by ziggwarth@Jun 16 2005, 08:53 PM
But what about a black hole colliding with another black hole? Could that also be a source for gamma ray bursts?

Yes it can, IFF at least one of the black holes is surrounded by a disk of material.

[ziggwarth]

Originally posted by antoniseb+Jun 16 2005, 10:26 PM--></div><table border='0' align='center' width='95%' cellpadding='3' cellspacing='1'><tr><td>QUOTE (antoniseb @ Jun 16 2005, 10:26 PM)</td></tr><tr><td id='QUOTE'> <!--QuoteBegin-ziggwarth@Jun 16 2005, 08:53 PM
But what about a black hole colliding with another black hole? Could that also be a source for gamma ray bursts?

Yes it can, IFF at least one of the black holes is surrounded by a disk of material. [/b][/quote]
Hm.. I see.
So if there is only 2 "plain" black holes (no matter surrounding any of them), there probably won&#39;t be a GRB?

[astromark]

The sudden out burst of gama rays from some distant place.
The death of a star, Its final burst of enrgy exceeding its gravaty. The shedding of large amounts of gama rays is hard to understand.
I personally dought that stellar colisions are the sorce of the bursts.
Is it possable that a larger black hole could exceed its own gravity and emit an enormouse outburst of energy, briefly. GRB. we dont actually know.
With the resorcess of the scientific comunity focused. I am sertian a clearer picture will emerg.
and do please stop quoting the scriptures at the top of your postings. If I want to read the bible, I will. Please stay focused on the sciencess. mark.

[nnunn]

A neutron star can collapse a long way before the ultimatonic Planck-scale oscillators implied by stringy theories start to impinge upon each other. Could it be that under certain conditions of spin and/or (a)symmetry that when the collapse reaches a critical level of condensation, some Planckian attributes of these smallest material components engage, and a mutual repulsion turns the stately classical GR collapse into an explosion measurable as a gamma ray burst? These bursts are so weird... it may take a weird model to explain them&#33;
Nigel

[man from kibish]

Originally posted by nnunn@Jun 21 2005, 12:38 PM
These bursts are so weird... it may take a weird model to explain them&#33;
Nigel

Well let me tell you about one of them weird models.

If there is a small neutral window of Zero net electric charge in the interaction between two nucleons [a proton and a neutron] - refer to Gravity is a Nuclear Force thread on Alternative Theories - then we can simply infer how this mechanism may produce a GRB... and much more.

Imagine a heavy element like iron in the core of a Star [ Mozina might like this&#33;]
Since the proton/neutron pairs are switching on/off there is a remote likelihood that once every blue blue moon all the pairs are momentarily off together. This means that in the next instant all these pairs will go positive. The effect of this is that the nearby electrons will be accelerated with such force that a GRB is emitted. [QED].

Have this effect on Earth - Earth&#39;s core is also iron-rich - and you get an Earthquake&#33;&#33; And land-mass will sink towards the point.

Have this effect on a smaller scale on the Sun... and you get a CME.

Of couse models are models and dreamers are dreamers&#33;

For me, at least, this idea is more plausible than having black holes or Neutron Stars colliding. If these things are colliding so often, every week, I wonder how the heck the Universe is said to be expanding&#33;


Your friendly man from Kibish in a fit of muse&#33;
Stephen