Mystery of coronae around supermassive black holes deepens

black hole
This computer-simulated image shows a supermassive black hole at the core of a galaxy. The black region in the center represents the black hole's event horizon, where no light can escape the massive object's gravitational grip. The black hole's powerful gravity distorts space around it like a funhouse mirror. Light from background stars is stretched and smeared as the stars skim by the black hole. Credit: NASA, ESA, and D. Coe, J. Anderson, and R. van der Marel (STScI)

Researchers from RIKEN and JAXA have used observations from the ALMA radio observatory located in northern Chile and managed by an international consortium including the National Astronomical Observatory of Japan (NAOJ) to measure, for the first time, the strength of magnetic fields near two supermassive black holes at the centers of an important type of active galaxies. Surprisingly, the strengths of the magnetic fields do not appear sufficient to power the "coronae," clouds of superheated plasma that are observed around the black holes at the centers of those galaxies.

It has long been known that the that lie at the centers of , sometimes outshining their host galaxies, have coronae of superheated plasma around them, similar to the corona around the Sun. For black holes, these coronae can be heated to a phenomenal temperature of one billion degrees Celsius. It was long assumed that, like that of the Sun, the coronae were heated by magnetic field energies. However, these magnetic fields had never been measured around black holes, leaving uncertainty regarding the exact mechanism.

In a 2014 paper, the research group predicted that electrons in the plasma surrounding the black holes would emit a special kind of light, known as , as they exist together with the magnetic forces in the coronae. Specifically, this radiation would be in the band, meaning electromagnetic waves with a long wavelength and low frequency. And the group set out to measure these fields.

They decided to look at data from two "nearby," in astronomical terms, active galactic nuclei: IC 4329A, which is about 200 million light-years away, and NGC 985, which is approximately 580 million light-years away. They began by taking measurements using the ALMA observatory in Chile, and then compared them to observations from two other : the VLA observatory in the United States and the ATCA in Australia, which measure slightly different frequency bands. The team found that indeed there was an excess of radio emission originating from synchrotron radiation, in addition to emissions from the "jets" cast out by the black holes.

Through the observations, the team deduced that the coronae had a size of about 40 Schwarzschild radii, the radius of a black hole from which not even light can escape, and a strength of about 10 gauss, a figure that is a bit more than the magnetic field at the surface of the Earth but quite a bit less than that given out by a typical refrigerator magnet.

"The surprise," says Yoshiyuki Inoue, the lead author of the paper, published in the Astrophysical Journal, "is that although we confirmed the emission of radio synchrotron radiation from the corona in both objects, it turns out that the magnetic we measured is much too weak to be able to drive the intense heating of the around these black holes." He also notes that the same phenomenon was observed in both galaxies, implying that it could be a general phenomenon.

Looking to the future, Inoue says that the group plans to look for signs of powerful gamma rays that should accompany the radio emissions, to further understand what is happening in the environment near supermassive .


Explore further

Magnetic fields may be the key to black hole activity

More information: Yoshiyuki Inoue et al. Detection of Coronal Magnetic Activity in nearby Active Supermassive Black Holes, The Astrophysical Journal (2018). DOI: 10.3847/1538-4357/aaeb95
Journal information: Astrophysical Journal

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Citation: Mystery of coronae around supermassive black holes deepens (2018, December 18) retrieved 23 July 2019 from https://phys.org/news/2018-12-mystery-coronae-supermassive-black-holes.html
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Dec 18, 2018
and a strength of about 10 gauss, a figure that is a bit more than the magnetic field at the surface of the Earth but quite a bit less than that given out by a typical refrigerator magnet.


I'm glad they said this because it should shut the EU gang up.

Dec 18, 2018
I'm glad they said this because it should shut the EU gang up.
probably not...

they'll be along shortly to misinterpret the above and then make various claims about how mainstream science doesn't know plasma physics, blah blah blah


Dec 18, 2018
"..and a strength of about 10 gauss, a figure that is a bit more than the magnetic field at the surface of the Earth"

The Earth's magnetic field at the surface is about ½ gauss.

"IC 4329A, which is about 200 million light-years away, and NGC 985, which is approximately 580 million light-years away."

Unfalsifiable, just like the BHs, not even worth discussing.


Dec 18, 2018
"The surprise," says Yoshiyuki Inoue, the lead author of the paper, published in the Astrophysical Journal, "is that although we confirmed the emission of radio synchrotron radiation from the corona in both objects, it turns out that the magnetic field we measured is much too weak to be able to drive the intense heating of the coronae around these black holes."

Not surprising, it is electric currents and electric fields doing the work here, the magnetic fields are a result of the currents.

I'm glad they said this because it should shut the EU gang up.

Clearly your ignorance blinds you.

Dec 18, 2018
Unfalsifiable, just like the BHs, not even worth discussing.


Then don't come here for discussion moron. What a concept.

Clearly your ignorance blinds you.


Irony.

Dec 18, 2018
"The surprise," says Yoshiyuki Inoue, the lead author of the paper, published in the Astrophysical Journal, "is that although we confirmed the emission of radio synchrotron radiation from the corona in both objects, it turns out that the magnetic field we measured is much too weak to be able to drive the intense heating of the coronae around these black holes."

Not surprising, it is electric currents and electric fields doing the work here, the magnetic fields are a result of the currents.

I'm glad they said this because it should shut the EU gang up.

Clearly your ignorance blinds you.


What a load of ignorant crap. As usual. Tell us how electric currents are causing the orbits of the stars around the SMBH at our galactic centre.? Don't you ever get tired of making up idiotic sh!t?

Dec 18, 2018
& if there are very little magnetic field to be observed? Then the "producing" electrical currents must also be weak?

Somebody not a locowooing cultist. Please correct me if I am wrong..

How can there be magnetic fields or electrical currents without a singular force of Electro-Magnetism?
How can there be any EM phenomena without a material generator or material for transporting the field?

So the gravity egg hatched to release the electrical chick?

Dec 18, 2018
So the gravity egg hatched to release the electrical chick?


Q.E.D

rotflmao

Dec 18, 2018
A spinning black hole with an electric charge makes a magnetic field.

Dec 18, 2018
Interesting. This implies that gravity is doing some of the work.

Dec 19, 2018
or the angular momentum

Dec 19, 2018
Tell us how electric currents are causing the orbits of the stars around the SMBH at our galactic centre.?

Hmmm, where in the above article or associated paper do they discuss the orbits of these stars jonesdumb speaks about? Oh right, they don't. It would appear as if jonesdumb is up to his usual tactics of the logical fallacy and changing the subject. What a surprise.
Why don't you stay on subject jonesdumb, this article is about electricity in space.

Dec 19, 2018
Why don't you stay on subject jonesdumb, this article is about electricity in space.


No, it isn't. No mention of electricity or currents in the article or the paper. You made it up. As usual.


Dec 19, 2018
Coronae or Corona

These coronae can be heated to a temperature of one billion degrees Celsius
The Sun's corona extends millions of kilometres into outer space heated to 1million degrees Celsius
Sagittarius*A's coronae does not even extend millions of kilometres into outer space
being that it is a super massive BH in its Galactic centre
these BHs coronae are obviously visible even though all super massive BHs are obscured with dust
as Sagittarius*A is obscured with dust

Dec 19, 2018
Gravity is a Constant of Mass.
No Mass, No Gravity.
No Gravity, No Mass.

Even the teensieist of infinitesimal dust or smaller single particle produces an attractant force of Gravity.

Yes, the output is constrained by the Inverse Square Rule. However, when you are discussing the dust clouds orbiting the BH? Those are humongous collections of mass. Within, by a Cosmic scale, a very small space.

All the petty, extraneous activities, such as Angular Momentum & Electro-Magnetism are generated from the Gravitational-bound toriod mass of dust.

Unless any one cares to explain how there can exist either angular-momentum or EM forces without there being any physical mass available?

Nothing from Nothing is Nothing.

Dec 19, 2018
No, it isn't. No mention of electricity or currents in the article or the paper. You made it up. As usual.

Of course, because you believe magnetic fields are created by magic.

Dec 19, 2018
or the angular momentum
Angular momentum can generate a magnetic field if there are moving charges, but we measured the magnetic field. So this is ruled out. That's the entire point of this article.

Angular momentum can also change the dynamics of particles but only by gravitational effects like frame dragging. So, like I said, if it ain't EM, gotta be gravity.

Dec 19, 2018
Interesting. This implies that gravity is doing some of the work.


@Schneib actually rotation is doing the work, just wait, you will see in some time

Dec 19, 2018
@Ultron, action is indicative of a force. Neither the color nor weak forces can act at scales of inches or centimeters. Thus there are only EM and gravity, and by measuring the magnetic field EM has been ruled out. That leaves gravity. Or magic. I'm going with gravity.

"Rotation" is not a force. It is a generator of force, but there has to be a force for it to generate.

Dec 19, 2018
@Ultron, action is indicative of a force. Neither the color nor weak forces can act at scales of inches or centimeters. Thus there are only EM and gravity, and by measuring the magnetic field EM has been ruled out. That leaves gravity. Or magic. I'm going with gravity.

"Rotation" is not a force. It is a generator of force, but there has to be a force for it to generate.


You are perfectly right, when regarding current knowledge about gravity. But this is not the full story and you will see in few years.

Dec 19, 2018
double post delete

Dec 19, 2018
@Ultron, relativistic effects of gravity, e.g. frame dragging, and other gravitomagnetism effects, are known. Someone will apply them to this problem before long, but your argument is "gravity of the gaps;" unless you have the chops to do the relativity math, you'll have to wait for the experts.

Dec 19, 2018
Having your cake and eating it
phys.org> we confirmed the emission of radio synchrotron radiation from the corona in both objects the the magnetic field we measured is much too weak to be able to drive the intense heating of the coronae


A BH is made of electrons and protons in the form of plasma
in the coronae and inside the BH is constructed of plasma at billions of degrees
an electric currant is soley the movement of electrons and protons
which is the magnetic field electrons use to produce synchrotron radiation

The coronae plasma are ions in relativistic velocity
the BH is ionic plasma in angular velocity
gravity is proportional to mass
where this mass is plasma
where this plasma is electrons and protons
gravity in the case of a BH and its coronae is proportional to its plasma
as the electic currents mass is proportional to the electrons and protons in the plasma

Without electric currant there is no synchrotron radiation

Dec 19, 2018
Without electric currant there is no synchrotron radiation
I don't think you understand synchrotron radiation. This is especially reinforced by your confusion of cured grapes with electricity.

Dec 19, 2018
Electric currants
Without electric currant there is no synchrotron radiation

Da Schneib> I don't think you understand synchrotron radiation. This is especially reinforced by your confusion of cured grapes with electricity.

Are like grapes
Electrifyingly sweet and tasty

Dec 19, 2018
Electrifyingly sweet and tasty
Without electric currant there is no synchrotron radiation

Electrons spiral the magnetic fields produced by the plasmas electric currents

Dec 19, 2018
Argh, Da Schneib! It hurts to read all the blithering nonsense from the woo fakirs...

Oh! The Humanity!"

Dec 19, 2018
Oh The Electron

The electrons in motion
in their hurt, their paths are curved
in their motion
their magnetic fields
follow their induced magnetic fields
in increasingly curvature of orbits
electric field in electric current in magnetic field in curvature
in plasmatic state in curvature of force
there is one force sufficiently stronger than gravity
there is only one with the electron
namely magnetic being the prime mover
in electrons only force, electric field in motion
These tightly spiralling electrons, in angular momentum of inertia

Dec 19, 2018
It's so very amusing to see these gaslight era gravity hucksters insist everything begins with gravity. As usual and just like jonesdumb, they reside in opposite world devoid of reality.
Electromagnetic forces acting on the plasma are many orders stronger than gravity, electromagnetic forces are what drive and contain the coronae. Gravity is but a short range very weak force, not the driver but only relevant after EM forces act to bring the matter close enough for gravity to work.

Dec 20, 2018
@cantthink69 didn't read the article.

Researchers from RIKEN and JAXA have used observations from the ALMA radio observatory located in northern Chile and managed by an international consortium including the National Astronomical Observatory of Japan (NAOJ) to measure, for the first time, the strength of magnetic fields near two supermassive black holes at the centers of an important type of active galaxies. Surprisingly, the strengths of the magnetic fields do not appear sufficient to power the "coronae," clouds of superheated plasma that are observed around the black holes at the centers of those galaxies.

Dec 20, 2018
Let me repeat that for the hard of thinking:
to measure, for the first time, the strength of magnetic fields near two supermassive black holes at the centers of an important type of active galaxies.
That's measure, not model, not infer, not estimate. Measure.

How did they do that? By looking for synchrotron radiation from electrons in those magnetic fields. This is generated when the magnetic field curves the path of the electrons, and is a subset of a general phenomenon called bremsstrahlung. The magnetic field accelerates the electrons and they must shed the energy somehow; bremsstrahlung is how.

As always the perils of commenting on an article you haven't read.

Dec 20, 2018
And here's the other thing: see, if there's all these electric currents, they're charged particles moving, right? So if there's these magnetic fields acting on them, where's the bremsstrahlung?

Ain't enough.

So are we done with EU yet? Ain't no currents. Ain't no field. Ain't no thunderbolts. Looks like it's mostly gravity. It's the only other choice. Beginning to get this now?

Dec 20, 2018
Ionic plasma in motion

Electrons in opposition of protons
electric charge in opposition of charge
electromotive of force
counteracting the heat of plasma force of repulsion
a balance of two opposing forces
expansion of heat in opposition of electric field of charge
in this close packed ionic plasma
glowing in billions of degrees
the electric force between electrons and protons
in their 1.0x10-15m quantum world
their electric field in thousands of Newton's of attractive force
between an electron and proton
is infinitely greater than gravity 's force between an electron and proton
it is the electric field that keeps this plasma in contact
in opposition of charge drives this plasmas electromotive force
in billions of protons and electrons in positive and negative of force
amounsts in thousands of billions of Newton's of attractive force
Sir Isaac Newton does not get a plasmatic look in
Ionic plasmatic electric field of attraction rules the roost

Dec 20, 2018
Gravity and Electric force
f=kq1xq2/r* versus f=G(167x10-31kg x 9.1x10-31kg)/(1x10-15)*
are two complementary forces
that gravity relies solely on the electrons mass of 9.1x10-31kgs
whereas electric charge relies on 1.6x10-19 coulombs
the gravitation force an electron exerts is 6.1x10-11Ns
whereas the electric force the electron exerts is 2.304x10+18Ns
the electric field is 3.8x10+28 times greater than Newton's gravitational force on an electron
however gravity is manipulated
This electric field of force is 38thousand million, million, million, million times greater than gravity

Dec 20, 2018
da schnied thinks he is smart yet cannot seem to grasp basic concepts;
Surprisingly, the strengths of the magnetic fields do not appear sufficient to power the "coronae," clouds of superheated plasma that are observed around the black holes at the centers of those galaxies.

You see da schnied? They are trying to "power" using magnetic fields, typical plasma ignoramus cart before the horse nonsense. It is the electric currents/fields which is powering the coronae, just like on the sun.

Dec 20, 2018
Coronae or Corona

These coronae can be heated to a temperature of one billion degrees Celsius
The Sun's corona extends millions of kilometres into outer space heated to 1million degrees Celsius
Sagittarius*A's coronae does not even extend millions of kilometres into outer space
being that it is a super massive BH in its Galactic centre
these BHs coronae are obviously visible even though all super massive BHs are obscured with dust
as Sagittarius*A is obscured with dust


.........because granDy, according to Pop-Cosmology there are two kinds of Cosmic Fairy Dust. There is the dark matter species & then the baryonic species at SgrA*, neither of which are EVER visible & which never obstruct the visibility of the closest masses of stars.

SgrA* is so unique, as compared to the above SIMULATION, that the Milky Way has come to have a unique BH of the known Universe, no corona, no accretion disc, & to top it off no disc that blocks starshine from background stars.

Dec 20, 2018
SgrA* is so unique, as compared to the above SIMULATION, that the Milky Way has come to have a unique BH of the known Universe, no corona, no accretion disc, & to top it off no disc that blocks starshine from background stars.


Yeah, yeah. Infinite density. Inverse square law. Yada yada, move along, nothing to see here.

Dec 20, 2018
SgrA* is so unique, as compared to the above SIMULATION, that the Milky Way has come to have a unique BH of the known Universe, no corona, no accretion disc, & to top it off no disc that blocks starshine from background stars.


Yeah, yeah. Infinite density. Inverse square law. Yada yada, move along, nothing to see here.
........and then comes the standard Pop-Cosmology response when they're unable to convince us why we should NOT believe in the Immutable Laws of Physics.

Dec 20, 2018
"........and then comes the standard Pop-Cosmology response when they're unable to convince us why we should NOT believe in the Immutable Laws of Physics."

When you see someone driving around on a flat tire one time, you feel sorry them, when you see it day after day... you just laugh.


Dec 20, 2018
Thank dog for the ignore button!

Dec 20, 2018
The impression that I'm getting from all the EU/plasma/magical-glister woocultists?

Is that they believe that magnetism, electricity, plasma, the lightbeams shooting from their eyes.
All exist without any material origin.

That out there, throughout the cosmic pachinko machine there are pinballing thunderbolts just carelessly being tossed around by rambunctious godlings.

See? All we needed to do was clarify the wooists level of stupid.
Between moron & cretin, I'd say.

Dec 20, 2018
Mystery of coronae around super massive BH deepens
Benni> SgA is so unique compared the above SIMULATION the Milky Way has come to have a unique BH of the known Universe no corona no accretion disc & to top it off no disc that blocks star shine from background stars

To be a BH or not to be a BH
phys.org> This computer simulation shows a super massive BH hole at the galactic core The black region represents the BHs event horizon The BHs gravity distorts space a funhouse mirror Light from background stars is stretched and smeared as the stars skim by the black hole

It's neither a BH or accretion disc
As an accretion disc is plasma
Is then a corona
Obscured by galactic dust
A BH simulation is perfectly legitimate as it makes no never mind
All BHs are obscured by dust
So even in simulation
We cannot be sure
That even the dust is a simulation
As there is no telling with these BHs
No one knows the truth any more
Wolfs been cried too many times

Dec 20, 2018
When you see someone driving around on a flat tire one time, you feel sorry them, when you see it day after day... you just laugh.


*A man in a straw hat with a reed of grass hanging from his lips sits on a wooden box with square wheels pointing and laughing*

"Uh-hyuh, lookit that moron driving with a flat tire, uh-hyuh"

*the man slaps his knees with laughter*

Please, don't feel sorry for anyone.

Dec 21, 2018
"Please, don't feel sorry for anyone."

"when you see it day after day... you just laugh. "

Guess one would need to be able to read and comprehend to understand sympathy was not what was being conveyed. Funny the sorts that wander into websites and do an intellectual faceplant with every comment.


Dec 21, 2018
Please teach me about reading and comprehension oh great and mighty yokel.

Dec 21, 2018
"Please teach me about reading and comprehension oh great and mighty yokel."

LMAO

"Funny the sorts that wander into websites and do an intellectual faceplant with every comment."

They should have done that for you sometime around grade 3....but the request does validate the rest of...you.


Dec 21, 2018
Did you just quote yourself? Cringeworthy.

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