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Questions tagged [relativistic-jets]

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

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Question about the toroidal magnetic field in quasars and the role of an ergosphere

1) Introduction Most of astrophysical bodies (in this context: formed stars, young stellar objects and black holes) produce or are immersed in a non-zero magnetic field $\vec{B}$. It is common, since ...
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Optical emission seen in Relativistic Jets from Quasars

So, I came across a very exciting paper on arXiv today. Here, they talk about the Hubble Space Telescope (HST) imaging of the host galaxy of the very first known quasar- 3C 273. My question is related ...
vivek's user avatar
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Why the Sun does not shoot relativistic jets?

I saw the features of the Sun here and it has almost everything include nanojets and CME but not relativistic jets. Isn't the Sun magnetically active so why isn't it capable of shooting out ...
user6760's user avatar
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Is creation of quark-gluon plasma endothermic?

When we create quark-gluon plasma in a lab by colliding lead nuclei, does releasing the nuclear bonds give us energy? Or take it? An astrophysical jet could be as hot as 10 trillion K: https://www....
MikeHelland's user avatar
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Jet streams from black holes - how can they be emitted? [duplicate]

I have seen many models showing the jet-streams shot out of black holes, and even some images. However, it is always said that a black hole has so strong of a gravity field, that not even light can ...
Superunknown's user avatar
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Does a white hole forms accretion disk?

A white is time reversal of a blackhole at least mathematically, I know it can't exist but may I know if it can form accretion disc similar to those stellar mass black holes. Does it spins on it's ...
user6760's user avatar
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3 votes
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Does the event when two BH without polar jets merge, cause a short living polar jet on the newly formed BH?

Does the event when two BH without polar jets merge, cause a short living polar jet on the newly formed BH? As BH need infalling material to activate their polar bursts does the BH falling into ...
Krešimir Bradvica's user avatar
2 votes
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Question about the Blandford-Znajek process

In the Blandford-Znajek Process (which is considered a potential mechanism to explain jets from AGN), the lorentz force is assumed to be vanishing (the force-free condition). But we see that the ...
jay121's user avatar
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Has it been observed so far an object moving towards a BH along the trajectory of the polar astrophysical jet?

If we assume that the cause of the astrophysical jet is the magnetism of the BH than an object falling towards the BH in counterdirection of 'polar jet' emitions should not feel any strong deflection ...
Krešimir Bradvica's user avatar
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Calculating Diagrams with Wilson Lines to One Loop

I have a question concerning the calculation of amplitudes containing Wilson lines. I want to calculate the jet function defined by equation (3.3) from this paper. $$\mathcal{J}(\text{arguments})u_s(p)...
George Smyridis's user avatar
4 votes
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Is there comprehensive catalogue of black holes and relativistic jets?

Basically I am looking for a database with RJs and BHs characteristics. In High Energy Physics there is Particle Data Group book which is updated regularly. Is there something similar? Upd.2023-01-17: ...
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Help in understanding how general relativity describes space-time near black hole poles that emit astrophysical jets

I am aware that General relativity does not explicitly deal with 'expanding' or growing and due to that reason 'cosmologically pressurised' aether (proposed by the 'Theory of a river flow' but that ...
Krešimir Bradvica's user avatar
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What would happen to a star caught in the path of an astrophysical jet?

The question pretty much captures it. What would happen to a star caught in the path of an astrophysical jet? I imagine the distance to the source of the jet, and the power of the source, matter most ...
Curious Layman's user avatar
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1 answer
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Has an object been observed falling inside the black hole in direction antiparallel to an astrophysical jet?

Has an object been observed falling inside the black hole in direction antiparallel to an astrophysical jet? I do not know if the jet is fighting against gravity or not so will that part around the ...
Krešimir Bradvica's user avatar
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3 answers
190 views

Why does relativity affect relativistic jets?

Relativistic jets are regions outside black holes where matter is spewed out. Wikipedia states that these jets will demonstrate relativistic effect such as relativistic beaming. I don't understand why ...
John Hon's user avatar
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If an astrophysical jet contains gamma rays does it mean that at the source poles there is small gravitational redshift?

If an astrophysical jet contains gamma rays does it mean that even though the source has incredibly strong gravitational pull, at the source poles there is small gravitational redshift? Maybe there is ...
Janko Bradvica's user avatar
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Are astrophysical jets at the poles of equal strength?

I know black hole and neutron star can eject subatomic charged particles as astrophysical jet, I am comparing our sun chaotic magnetic field vs those in black hole jet and pulsars. The former ...
user6760's user avatar
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Are there black holes without accretion disk but emitting astrophysical jets?

First a citation from Wikipedia page about relativistic jets: "Jets may also be observed from spinning neutron stars. An example is pulsar IGR J11014-6103, which has the largest jet so far ...
Janko Bradvica's user avatar
2 votes
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112 views

How is the rotational energy of a black hole converted into a magnetic field used to power relativistic jets?

When an electric charge is lowered into a nonrotating black hole it will "spread" itself across the surface, and the surface will behave like an electrical conductor. Why does this spread ...
bukarest01's user avatar
2 votes
1 answer
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Can the gravity of one entire galaxy slow down an astrophysical jet emitted from its central black hole?

Let say we are talking about our Milky way and Sagittarius A* emitted a astrophysical jet. If the galaxy was 150 000 ly wide would its gravity with dark matter included eventually slow down that jet ...
Janko Bradvica's user avatar
1 vote
1 answer
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Relativistic Jets in Black Holes

It is understood till now that nothing is faster than speed of light and we also know that even light cannot come out of black hole(that’s why the name black). So does that mean that the Relativistic ...
FastAndTheCurious's user avatar
3 votes
1 answer
151 views

Distinguishing between quark and gluon jets

How do experimentalists at the LHC differentiate between jets produced by quarks and those produced by gluons. I know that for b quarks there is a b-tagging method, but what do they do for the others ...
JohnDoe122's user avatar
1 vote
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158 views

Kelvin-Helmholtz theorem in Relativistic regime [closed]

Using the Carter-Lichnerowicz equation of motion $\Omega_{\mu \nu}u^{\nu}=T\nabla_{\mu}s$, we obtain $Tu^{\mu}\nabla_{\mu}s=0$, where s is the specific entropy, $u^{\mu}$ the velocity of the fluid and ...
marco marino's user avatar
2 votes
1 answer
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What elements do black holes expel into relativistic jets?

What does current research say about the elements that can be created in the accretion disc of a black hole, and does the Relativistic Jet contain any of those elements? Curious as to whether the ...
Demis's user avatar
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Problem with the mass of exhaust when deriving relativistic rocket equation

In my special relativity book, there is a derivation of the velocity of a rocket. Let the rocket have rest mass $m$ (which decreases over time) and velocity $v$ in an inertial frame, and let the ...
Ma Joad's user avatar
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6 votes
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Why is there no jet visible in the M87* black hole radio image?

M87 is known to contain a jet that is likely created by the supermassive black hole at its center. The recently published radio image taken by the Event Horizon Telescope does not display any ...
Jens's user avatar
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2 votes
2 answers
193 views

How can cosmic jets exist? [duplicate]

Cosmic jets are jets of matter ejected from super massive black holes. The gravitational pull of a black hole is so high that even light can't escape it. Yet particles with mass traveling at speeds ...
SamwellTarly's user avatar
1 vote
1 answer
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Why the reconstructed jet need to substract the "background"?

There is a trouble bother me a long time. I know it may be stupid question. But I really need your help. It's in the CMS paper: CMS Collaboration, CMS Physics Analysis Summary No. CMS-PAS-HIN-12-013,...
A.Luo's user avatar
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What Black Holes causes Astrophysical Jets?

this is my first question, so here goes, I was wondering, what kind of Black Holes creates Astrophysical Jets that shows as massive clouds of particles shooting out of the Black Hole. What would be ...
C. Jordan's user avatar
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Can rotating black hole have toroidal event horizon with penetrating relativistic jet(s)?

It is conjectured that a rotating black hole has at its center a ring-shaped singularity. Thus, at the center of the ring-shaped singularity the gravitational field must be zero (similar to ...
Halfdan Faber's user avatar
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Relativistic emission from a spherical outflow (doppler boost and apparent velocities)

If I'm observing radiation emitted from a spherical outflow, is it correct to assume that that on the axis of the spherical outflow perpendicular to the observer the doppler boost is similar to the ...
Akerfeldt's user avatar
-2 votes
2 answers
342 views

Is it possible that black holes have an anti-matter jet? [closed]

If we can think of the black hole in the center of our galaxy as a group of decaying atoms with neutrinos coming from one side in the jet and anti neutrinos from the other side then would it be ...
Muze's user avatar
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4 votes
2 answers
301 views

How do we know that Quasars actually produce collimated jets?

How did astrophysicists know this? Of course it's very difficult to directly see the jets from Quasars, so I'm wondering how did they come to the conclusion that Quasars produce collimated jets or ...
user43783's user avatar
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0 votes
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The production of cosmic jets [duplicate]

For cosmic jets produced in gamma ray bursts or quasars, I've read that you have to assume a "Force-free magnetosphere" in order to explain these phenomena through electromagnetism. From my ...
user43783's user avatar
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2 votes
1 answer
155 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 ...
Sean Mooney's user avatar
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2 answers
187 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 ...
Celeritas's user avatar
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8 votes
3 answers
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Why are pulsar's radiation beams collimated?

Every picture of a pulsar I 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 ...
Diracology's user avatar
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2 votes
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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 ...
Tom's user avatar
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1 answer
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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 ...
Tom's user avatar
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3 votes
1 answer
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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 ...
user43783's user avatar
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5 votes
3 answers
302 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 ...
Justas's user avatar
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2 votes
1 answer
111 views

Black hole corona and bipolar outflows

What are black hole coronas? Are they different from accretion disks? If so, how are they formed?
Satyajit Sen's user avatar
1 vote
0 answers
89 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 ...
OTH's user avatar
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2 votes
1 answer
441 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 ...
user avatar
23 votes
2 answers
10k views

How can Quasars emit anything if they're black holes?

We've heard it many times, nothing can escape the gravity of a black hole, even light once it's past the event horizon. If this is true, how can a black hole emit anything? Quasars are massive black ...
user avatar
2 votes
1 answer
224 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 $P$ ...
peterh's user avatar
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0 votes
1 answer
230 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 ...
Jani Kovacs's user avatar
9 votes
2 answers
489 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 ...
AnimatedPhysics's user avatar
1 vote
1 answer
860 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 ...
AnimatedPhysics's user avatar
10 votes
1 answer
673 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?
dan's user avatar
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