To be used for astrophysical jets -- collimated, relativistic outflows often due to accretion onto compact objects.

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9
votes
2answers
268 views

Which way do black hole jets spin?

The centers of black holes and quasars often have jets coming out the two poles of an accretion disk, say north and south. Is it known if the two jets spin in the same direction or opposite ...
8
votes
1answer
155 views

Where do the bipolar jets of black holes come from?

How are they formed? And why are they so bright?
8
votes
1answer
270 views

Why are polar jets emitted along the axis of rotation?

Why are streams of energy-matter emitted along the axis of rotation of compact objects? (or) what is the reason that they are emitted along the axis of rotation of a compact object?
6
votes
0answers
145 views

What is the proper time used in relativistic non-equilibrium statistical physics?

In the literature one often finds covariant relativistic generalizations of classical non equilibrium statistical equations (Boltzmann, Vlasov, Landau, Fokker-Planck, etc...) but I wonder what is the ...
5
votes
3answers
53 views

Why are pulsar's radiation beams collimated?

Every picture of a pulsar a see shows a very collimated radiation beam. What is the mechanism generating such a collimation? Note: I am not talking about "relativistic jets". I am talking about ...
4
votes
1answer
294 views

models for astrophysical relativistic jets from compact objects

what is the simplest way to understand the physics of relativistic jets? we know that they have axial symmetry with very tight angular spread, presumably aligned with the axis of rotation of the ...
4
votes
3answers
127 views

Why are the jets of the “light saber” star slightly curved?

Why don't the jets of the HH-24 object follow a straight line? In the image below, notice how they bend towards left from the expected straight line. Is it an optical distortion, or some nearby ...
3
votes
1answer
143 views

How do black hole jets form? [duplicate]

A black hole, neutron star or any object that has accumulated an accretion disc, sometimes features opposing jets, positioned perpendicular to the accretion disc. I understand that these jets are ...
3
votes
1answer
32 views

Do AGN produce protons that are relativistic enough to collide with the CMB and make pions?

AGN (Active Galactic Nuclei) produce protons in their jets and they are relativistic. I was reading about photo-pion production, where a proton and photon annihilate to produce a pion. Could this ...
3
votes
1answer
36 views

Question about the Blandford–Znajek process

I've been trying to understand the Blandford–Znajek process which explains how Gamma Ray Bursts form, but it's still not clear to me how it works. In this article, several theories about the formation ...
3
votes
1answer
201 views

Pulsar beam radiant intensity distribution

I'm curious about the radiant intensity distribution of pulsars: what's the general dependence of intensity on angle, and what are typical angular beam widths? How much does the beam width vary ...
3
votes
0answers
27 views

Lense-Thirring Precession of short GRBs

Stone et al. 2014 have proposed that the jet resulting from the merger of a black hole (BH) and neutron star (NS) may precess due to Lense Thirring torques A large rotating mass e.g. the Earth, can ...
2
votes
1answer
38 views

Black hole corona and bipolar outflows

What are black hole coronas? Are they different from accretion disks? If so, how are they formed?
2
votes
1answer
72 views

Easy formula for ultrarelativistic bremsstrahlung?

I am very curious if an easy calculable formula for the bremstrahlung radiation of deeply relativistic, charged particles exists, if they are moving on circular orbit: $P(E,m_0,Q,r)=?$ ...where $P$...
1
vote
1answer
267 views

Visual representations of black holes

Some black holes emit jets that are rapidly circling the poles of what appears to be a sphere at the center of the black hole, cf. Fig. 1. Is there really a sphere here and how far (relative to the ...
1
vote
1answer
28 views

Relativistic blast waves in medium of non uniform density

The relativistic outflow of a gamma ray burst drives a shock into the circumburst medium. This medium could have a uniform density $n_0$ or a density profile of the form, $n(r) \propto r^{-2}$. For ...
1
vote
0answers
51 views

Origin of Jet production: Active Galactic Nuclei

According to Netzer's book on Active Galactic Nuclei (AGN), pair production ($\gamma \gamma \leftrightarrow e^+ e^-$) which causes AGN jets presumably happens in "the corona of the central accretion ...
0
votes
2answers
69 views

Can objects exit a black hole?

I read an article claiming that an object had been observed to be ejected from a black hole. This was the newest article I could find published on it but they still seem uncertain what the object was ...
0
votes
1answer
157 views

(Polar jets) Is it possible that black holes radiate substantial amount of the mass/energy they accrete?

Is the amount of energy a black hole emit through polar jets comparable to the mass it accretes or is it negligible? Here I am mostly concerned about the observational findings as opposed to the ...