The diameter of the discovered black hole is only 25 kilometers and its mass is 3.8 solar masses
Black holes seem to have no upper limit. There are black holes with a mass hundreds of millions of times greater than the Sun. But how small can they be? Astronomers have discovered what is believed to be the smallest black hole ever discovered. They had a mass of only 3.8 solar masses, and a diameter of 25 kilometers.
The discovery was announced by Nikolai Shopusnikov from NASA's Goddard Space Flight Center and his colleagues at the annual meeting of the American Astronomical Society - High Energy Division.
The tiny black hole, named XTE J1650-500 which was discovered back in 2001 in a binary system together with a regular star. Astronomers have known about the double system for several years, but they have finally been able to make precise measurements using the Russian space telescope to locate the exact valve of the two components of the system.
Although black holes themselves are invisible, they are often surrounded by a disk of hot gas and dust that is drawn to it like water down a sink. As the hot gas accumulates, it releases X-rays at regular intervals. Astronomers have long estimated that the frequency of X-ray bursts depends on the mass of the stars. As the mass of the black hole increases, the dust disk spreads outward and then the frequency of X-ray emission decreases.
By crossing this method with other methods, the scientists were able to develop a technique to measure the weight of black holes, the team is convinced that they have found the trick that makes it possible to measure the masses of black holes. When they applied the technique to XTE J1650-500 they found that its mass is 3.8 solar masses plus or minus half a solar mass. This figure is significantly smaller than the previous record - a black hole that melted 6.3 solar masses. The question is therefore what is the possible lower limit for a black hole? Astronomers estimate that it weighs between 1.7 and 2.7 solar masses. A smaller mass means a neutron star. Finding a black hole approaching the lower limit will help better understand how matter behaves when it collides in this extreme environment.
27 תגובות
I'm not a woman I'm a girl Today at my school, my whole school is full of strangeness and all the classes went out to Migresh and everyone saw him the black hole it was very scary=[
To Mr. A. Ben-Noor
There is nothing easier than joining a popular opinion.
The question is if you dare to deviate from the norm.
True, I know that most of those who deviate from the norm are wrong and it is easy for people to attack unusual opinions because they are usually not true, but remember, only a deviation from the norm will lead to a breakthrough in science and in everything else.
So maybe my opinions are nonsense, and maybe I only have a little basic education,
But, as long as they don't ban access to the science site at the IQ barrier, I will continue to enter the site.
I will also point out that the IQ barrier that prevents me from entering the site will also prevent many, many, others from entering the site.
Therefore, to make it easier, it is better for those who want to, to skip my response.
I live well with it.
Sabdarmish Yehuda
You have to be careful not to fall into black holes - even in discussions
Les Sabderami Yehuda, the famous one.
You rhymed well and without stumbling.
and in the required brevity and in a restrained manner.
And you didn't leave Blizovsky my father unsatisfied (and it's nice that way).
Love you for the beauty of your rhyme.
I………..by your side.(
(In the moral sense of course
And not from a physical point of view - mercifully.
And all this I emphasize and say
Although most of your opinions I find contradictory.
But in my opinion it is true and important in principle. Always doubt and look for a counter-explanation.
But together with Z and more I will not add.
in science to say something valuable
It is not enough to be interested, a little more than a basic education is needed.
No. Ben-Ner, the famous poet,
who also sometimes deals with science
If you don't feel like reading the comments
So keep a distance from all articles
To us the one brings, the Baki
my father
B. L. I. Z. V. S. K. I
And we will continue and honor you,
And we won't want you
to lose.
And I will finish in the name of science
Sabdarmish Yehuda
The song in honor of Yehuda Sabdarmish
Yehuda Sabdarmish
There is a flexible thinking kosher
He likes to challenge every retarded interview (in his opinion and also for the sake of the rhyme)
That's the reason by the way
that he upsets (part of..) her environment
One way or another
Without any arrogance, or arrogance
I tell you this my friend and friend
Please be brief in your responses
If not, do it
You may get tired of me
And it's a really unwanted move
Because my time is short and not abundant.
the pop
Yehuda:
You must internalize what causes the black hole phenomenon to understand it.
A black hole, in addition to the fact that the escape velocity from it is the speed of light, is also such that the forces holding its structure are not strong enough and it collapses inward.
A normal star maintains its volume due to nuclear activity.
When the nuclear energy runs out (all the light atoms have fused into heavy ones) then, depending on its mass, a collapse occurs in it which is stopped by forces acting on it. If the mass is sufficiently quenched then the electromagnetic force stops the collapse and the atoms remain atoms.
If the mass is greater the atoms can break up and if it is even greater then the force holding the elementary particles as they are surrenders and some of them merge creating a neutron star.
Stronger forces will also overwhelm this structure and currently there are no known forces that can prevent a black hole from collapsing into a point.
It is believed that from the considerations of quantum theory it is not a matter of a point but of a volume - how did you say? Pizzi Pizzi
By the way - when a black hole rotates (in fact, almost always) then the shape of this volume changes and it does not appear as a point but as a ring.
You received the personal information about Radius Schwarzschild on this website and it is reliable.
http://sciencenow.sciencemag.org/cgi/content/full/2008/401/2
I don't understand why you think black black is a point. The definition of a black hole is one whose attraction is so great that it manages to swallow even the electromagnetic rays. The Schurtschild radius determines for any mass what is the radius below which the body becomes a black hole. Regarding the sun, it is a number of kilometers; regarding the earth, it is a number of millimeters.
The Schwarzschild radius means that any light ray that reaches the aforementioned radius will be absorbed by the black hole. This radius is also called the event horizon. The black hole must be smaller than or equal to it, but not necessarily a point (singular).
For example, the Schurtzchild radius for a certain mass is a meter, so if the same mass is concentrated in a sphere of up to a meter radius, it will become a black hole, but it can also be concentrated more, for example, to half a meter or half a centimeter, and it will still be a black hole. But the event horizon will always be at a meter radius.
This is personal information and I hope I am misleading you.
Good night
Sabdarmish Yehuda
A black hole is not a point. A black hole is made of elementary space-time matter (string loops?).
To the question appearing in response 9.
I hope you have understood by now that the mass of a black hole does not decrease when matter falls into it and that its initial mass simply does not include the entire mass of the star from which it was created (from response 14 it can be concluded that you understood this).
In general, there is currently no practical way to find out anything about the past of a black hole other than the three basic properties of mass, angular momentum and charge, all of which it inherits from the material that makes it up.
There is a hypothesis that says that, in principle, the entropy of the components of the black hole can be recovered from Hawking radiation that it "emits", but I assume that you hardly understood a single word in this sentence and it is not really important because at the moment it is a completely theoretical thing.
There are a lot of links - just go to http://www.ask.com And ask what you want to ask - for example something like the following:
what is the mass required for a star to become a black hole
You will get a ton of links, many of which are relevant.
In terms of books, I suggest reading Kip S. Thorne's book called
Black Holes and Time Warps
Regarding the question about Super Nova - the answer is no. Sometimes the result of a supernova is a black hole and sometimes the result is a neutron star - depending on the mass.
Fix:
According to the Tolman-Oppenheimer-Volkoff limit the mass of a stellar black hole (created as a result of a type 2 supernova of a star with a mass of at least 20 solar masses) can reach at least a mass of 3 solar masses.
Michael:
Every star that goes supernova becomes a black hole?
And regarding the second comment, do you have a link or a book or anything else that can explain this theory about the sun to me?
Supplement to Offry:
The end of our sun will not be a red giant but a white dwarf.
A red giant is just a step on the way.
Offry:
The process of turning a star into a black hole is usually an extremely violent explosion (super nova) in which a large part of the mass is thrown outwards while the inner part is compressed into a black hole.
What remains in the end inside the black hole does not have to be very large and the black hole we are talking about here demonstrates this.
According to what I once read, a star must be three solar masses or higher to become a black hole in the future, and that's why our sun will not be a black hole but a red giant (as far as I remember).
If so, then how can it be that the mass of the black hole is less than 3 solar masses (unless there is a theory that upon collapsing into a black hole the mass of the star is less)?
If what I wrote is wrong, blame me :)
As far as I know, theoretically the mass of the black hole decreases when matter is swallowed into it, i.e. is it true to say that finding the mass of the black hole cannot give us much information about its past?
According to the Tolman-Oppenheimer-Volkoff limit, the mass of the star that a black hole will have under the appropriate conditions is about 3 solar masses, it would be interesting to find a black hole with a mass less than that, as this could be a good basis for proving that the mass reduction does take place.
Aryeh Seter is right and he is also right in assuming that this is the event horizon.
When we talk about the diameter of a black hole we talk about the diameter of its event horizon.
According to the calculation, the Schwarzschild radius for a black hole with a mass of 4 solar masses is really about 25 km in diameter.
All this does not mean that it is not a hoax because it turns out that the link to Universe Today doesn't work either.
ROSSI
A. P. As far as I understood black hole contact, and it doesn't matter what its mass is, is pointwise. It is true that black matter is created when there is a certain ratio between its mass and its diameter, but from the moment it is created, it is, for us, of point size. The physical size that changes according to its mass is the radius of the event horizon that creates a kind of count around the singular point of the hole. In the knowledge, the specified diameter is probably the one that was before it became a black hole, and not the diameter of the event horizon as I wrote in my first response, because the value of the event horizon is usually expressed in units of length - the distance of the horizon from the hole and this is a radius and not a diameter. Let's read responses from physicists.
Of course it has a diameter.
When the star collapses the density of the material naturally increases. A black hole is formed when the star undergoes a certain ratio between the mass and the distance of the surface from the center, since gravity also depends on the distance from the center. A black hole is still a defined body with mass and diameter, regardless of the phenomena associated with gravity exceeding the escape velocity of light.
"Russian space telescope" as it says - or a Russian space telescope?
All this information seems a bit problematic to me.
As far as I understand, tiny black holes are created in particle accelerators and disappear very quickly. I must point out that I don't exactly understand how it could be, but that's what I heard in a series of lectures by... I forgot his name. And maybe this is the reason!
It might be a bit April Fools. Since when does a black hole have a diameter? Maybe it means the event horizon. What is it, the reporters at Universe Today don't understand physics?
The small will be big