Questions tagged [high-energy-astrophysics]
Questions touching the field of elementary particle physics, which require high energies to be studied. Use this tag if you are asking about quarks, gluons, mesons, hadrons, leptons, etc.
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Why are there no gamma-ray bursts detected in our galaxy?
I found from Wikipedia and other sites that there are no GRBs detected in the Milky Way. Can someone give a feasible reason for that? Why are there no GRBs detected in the Milky Way galaxy?
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What's the percentage of strange matter inside a star at any time?
Is there any amount of strange matter (or "top matter"?) inside stars?
By strange matter I mean matter made out of flavours of quark other than up/down.
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How can astronomers pinpoint the location of the source of a neutrino?
In the popular press, in recent months, we have heard a lot about high-energy neutrinos from far outside our solar system reaching our detectors....
But I wonder...
If a single neutrino from a great ...
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3
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On (minuscule) dark matter production in supernovae
It is believed that dark matter is made of particles, which interact with matter only weakly and gravitationally. One common candidate for dark matter are so called WIMPs. WIMPs, specifically, are ...
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How will the recent appearance of a supernova, the closest in 27 years, help reduce the uncertainties in our measurements of dark energy?
A supernova has been recently spotted on M82, also known as the cigar galaxy. Being the closest to earth in 27 years and given the advances of technology this article proposes that:
...as the ...
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How does the Gamma Ray Burst that occurred when 2 black holes merged compare to other GRB's?
A Gamma Ray Burst was detected 0.4 seconds after the gravitational wave event, GW150914, caused by a black hole merger, and it was in the same part of the sky. It is uncertain whether that Gamma Ray ...
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Amount of energy of the Big Bang
What is the currently accepted estimated range of the amount of energy of the Big Bang event?
In joules at some estimated size, so a temperature may be calculated.
For context, I wonder if the ...
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What does it mean for something to be optically thick to pair production?
I have seen several references in the high energy astrophysics literature (including the example below) which make reference to an astronomical source being "thick to pair production".
What ...
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How can a singularity rotate?
So I've heard that all black holes that have been observed rotate to some degree. But if it has zero radius, how is it even possible for the black hole itself to be spinning? Or is it just all the ...
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Does a gravitational wave loses energy over distance?
How does a gravitational wave travel over vast distances without losing its energy? Could they go on forever as long as the Space?
Thank you
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Do the newly-created deuterons in our Sun release any photons? In addition to a positron and an electron neutrino?
Perhaps this is a nuclear physics question, but....
When two colliding protons deep inside our Sun finally turn into a deuterium nucleus or deutron (after approximately ten octillion chances, on ...
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meaning of p-wave charmonia
What exactly does p-wave mean when referring to particles, like charmonia states.
For example, see the following reference:
http://arxiv.org/abs/hep-ph/9208254
My doubt is - p wave in scattering ...
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Do all the accretion disks around a compact object (black hole or neutron star) emit astrophysical jet outflow?
Do all the accretion disks around a compact object (black hole or neutron star) emit astrophysical jet outflow? I mean is it mandatory for a jet to be emitted from an accretion disk?
If so, then why?
...
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What type of energy is escaping from black-hole's poles?
Following this article, it is stated that:
As a star drifts too close to a supermassive black hole, intense tidal
stresses rip the star to shreds. As this happens, the shredded
material will ...
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Non-thermal Sunyaev-Zel'dovich effect
Exactly what is the non-thermal Sunyaev-Zel'dovich effect? From what I understand from reading several papers by Mark Birkinshaw and Sergio Colafrancesco, I get the rough idea that the non-thermal SZ ...
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