Observations made by the European Southern Observatory of the galaxy NGC-4945 suggest that the object is a spiral galaxy very similar to our own, with rotating arms and an elongated core
The European Southern Observatory (ESO) has captured spectacular images of a nearby galaxy that many astronomers believe is similar to our own Milky Way. Although we see the galaxy from the side, observations of NGC-4945 suggest that the object is a spiral galaxy very similar to our own, with rotating arms and an elongated core.
The galaxy NGC-4945 most likely houses a supermassive black hole at its center, devouring every bit of matter in its path and throwing enormous energy into space.
Since NGC-4945 is only 13 million light-years away in the constellation Centaurus, even a modest field telescope will be sufficient to locate the galaxy. The galaxy was discovered by the Scottish astronomer James Dunlop in 1926 and its name was given to it in the "New General Catalogue" (the NGC) compiled by the Danish-Irish astronomer John Lewis Emil Dreyer a few decades later.
Today, NGC-4945 appears from our perspective, as seen through the lens of the Wide Field Imager (WFI) attached to the European Southern Observatory's La Silla telescope, as a cigar-like object, but in fact this galaxy is much wider than its thickness, with bands of stars and glowing gas swirling within it. around its center. Using special optical filters, it is possible to isolate the color of light emitted from heated gases such as hydrogen. The image shows sharp differences in the galaxy, which indicates regions where stars are formed.
Further observations revealed that NGC-4945 has an active galactic core, meaning that much higher energy is emitted from its core than in other calmer galaxies such as our Milky Way. Scientists classify NGC-4945 as a Siefert galaxy named after Carl K. Siefert who published a study in 1943 about a strange light signature emitted from certain galactic cores.
Since then astronomers tend to believe that supermassive black holes are wreaking havoc in the centers of Sifter galaxies. Black holes attract gas and dust that are heated and accelerated to such an extent that they emit high-energy radiation, such as X-rays and ultraviolet rays. In the center of most of the large spiral galaxies, including the Milky Way, there is a black hole, although many of them are no longer "fed" at this stage of galactic development.
For the article on the Southern European Observatory website
12 תגובות
Say it is possible in space to be in another galaxy to live there and it is better there and the alien galaxy is getting closer to us and there will be life and they will like humans and animals
interested:
The radiation you are talking about is Hawking radiation (or Beckenstein - Hawking, after the contribution of the Israeli scientist - Jacob Beckenstein to its prediction).
Note that I used the word "prediction" and not the word "discovery" because this radiation has not yet been discovered.
The fact that this radiation has not yet been discovered in practice is the reason why I did not mention it in my words.
http://en.wikipedia.org/wiki/Hawking_radiation
Thank you Michael for the enlightening answers.
According to what I understand, something else is also happening at the border of the event horizon of the black hole
which causes decay, the product of which is radiation, which indicates its existence.
How fun to have such a site.
questionnaire:
They say this because all the data points to it.
The fact that the radiation from this area is strong is due both to the concentration of many stars in the area and to the fact that black holes - although they do not emit light - cause the matter swirling around them to emit a lot of light.
That the black hole itself does not emit light is of no consequence.
A black hole that has dissolved a million solar masses has a radius of 3 million kilometers (ie - only 4 times the radius of the sun). This is nothing compared to the vast expanses of the galaxy (the radius of the Milky Way, for example, is 50 thousand light years, which is 473,040,000,000,000,000 km)
Why do they say that there are black holes in the center of many galaxies while in 99%
From the images of the galaxies, does the strongest light emanate from their center? I'm not sure about
The other radiations are at different frequencies (gamma, radio, ultraviolet, etc.), but why the light
Will the visible "wrap" the black hole or its surroundings? And of course, why would it hatch?
From where he is supposed to be swallowed?
Thanks.
Constellation in this case is just a general name for orientation on the map of the sky, the more familiar groups are the same 13 groups that make up the zodiac. There is no real connection between the stars in the group - each one is at a different distance, ranging from a few light years to 25 thousand light years (with the eye, in a telescope, of course, you can see much more), and they are only close to each other in the line of sight. It's kind of like dividing the earth into countries (only in heaven there were no wars over the borders of the countries like on earth). Between these boundaries of each group there are those stars that are visible and millions more stars that are not visible, and of course the galaxies beyond the Milky Way.
I believe there is a mistake in the article
"In the constellation Centaurus" is supposed to be "the cluster of galaxies", isn't it?!
Because a galaxy contains a huge number of stars
questionnaire:
You are welcome to ask questions even when I am not "here".
If I'm not here I'm somewhere else and in the end it's very likely that I'll return to "here" and even by the time I return there will surely be someone to answer you.
A black hole is something that cannot be observed directly because observing something requires a ray of light to come out of it and reach the observer's eye.
A black hole is by definition a body so massive that light rays cannot leave it.
Therefore the answer to your question is of course "no" and it will remain so, apparently, forever.
However, indirect evidence of black holes has also been observed.
By the way - although black black is by definition unobservable, there are many other things in the world that we infer their existence only by indirect evidence.
In fact, a large part of the elementary particles are like that.
The reason for the spiral structure is not clearly known.
As you will see here:
http://en.wikipedia.org/wiki/Spiral_galaxy#Origin_of_spiral_structure
There is a suggestion made on the subject, but facts that contradict it have already been found.
Certainly the black hole in the center of the galaxy is related to the structure of the galaxy. After all, he is part of this structure.
I don't know how the black hole relates to the continuation of the question which seems to me to be a repetition of the question why the structure is spiral.
The lead balls are electromagnetically neutral (because every atom - containing an equal number of electrons and protons is neutral).
Your persistent return to an electromagnetic factor of gravity is beyond me.
By the way: since the theory of relativity predicts a change in the effective mass of a body as a result of its rapid movement while not predicting a change in its electromagnetic charge, it is easy to contradict your claim also from relativistic considerations.
The photon, for example, has no electromagnetic charge. Its rest mass is also zero but since it is in fast motion it has an effective mass different from zero and therefore it is also affected by gravity without having any charge.
I know you are not Yehuda Sabdarmish.
Mr. Rothschild, if you're already here then maybe I'll ask you a few questions.
A. Has a black hole ever been observed directly or indirectly (its immediate vicinity),
In order to establish its theoretical existence? Or you "see something there" and all the rest
Is the interpretation of what you see unclear?
B. Is it clear why many galaxies take the form of a spiral disk, and what it is
Mechanics and the forces involved in their form?
third. Because it was not long ago that astrophysicists "realized" that at the center of
Many galaxies "sit" a black hole (and a massive one), and if this is true then
Maybe it is also related to the structure of the galaxy, so why those galaxies are not visible
Like a flat disc (and wide in the center) without the protruding "spiral arms".
out of it?
By the way, regarding Cavendish's experiment, it is possible that the "gravitational force" projected from spheres
The lead, is it none other than the electromagnetic force that binds the atoms together?
After all, if it is not so, it is "stopped" in the body shell and is not projected out, which is true
Looks weird?
Thanks.
post Scriptum. I'm not Yehuda Seb…… Asher his name is a bit hard for me to pronounce.
pit:
If you ask a significant question, it may be that the many concepts that people have (contrary to your opinion that they have no idea) will allow them to give you an answer, but at the moment your question is not clear.
What is "stopping" a black hole?
Say, is such a dangerous thing for our universe?
Is it possible to stop a black hole?
Like stopping a whirlwind
I mean I understand that right now nobody has a clue
But is it possible?