If clouds of gas with a mass millions of times greater than the Sun migrate to the center of the galaxy, they can be swallowed up by the supermassive black hole that resides there, or through certain triggers they can become a birthing center for new stars
If clouds of gas with a mass of millions of times greater than the Sun migrate to the center of the galaxy, they can be swallowed by the supermassive black hole that resides there, or through certain triggers they can be a birthing center for new stars.
"For some time, astrophysicists knew that gas clouds fall into galaxies, and also knew that active galactic cores are powered by gas falling into supermassive black holes," says Barry McKernan, a researcher in the Department of Astrophysics at the American Museum of American History and a professor at the City University of New York. -York. "But no one has connected the two ideas until now, and said 'hey, maybe one causes the other'! ".
Scientists today believe that at the center of all galaxies there are black holes, but only some of the galactic cores show signs of brighter activity due to material falling into the black hole. The new study provides an explanation for the problem: in galactic centers where the fall of the clouds has been suspended there is enough fuel to light thousands of new stars that are born and immediately swallowed by the black hole. In galaxies where gas clouds have not collided with the core recently (about 10 million years ago), the centers will not show signs of activity and their cores will look "normal".
"It is interesting that only some galaxies are active, even though we believe that at the center of all galaxies there are supermassive black holes," says K. A. Sabic Ford, researcher from the museum. "The cloud collision idea provides an explanation: it's just a matter of luck."
The study was published in the online journal Astrophysical Journal Letters.
12 תגובות
Thanks Yael for the great articles
You gave man a photon, you gave him light for a millionth of a second.
You taught a man how to vibrate an electron, you provided him with light for life
rationalize
Sorry that's what you understood from my observation conversation with you and others.
Where did you find out that I was talking about dust particles that move galaxies? bullshit.
What relativistic adjustments are you talking about? Who needs them anyway when they contribute a fraction of a percent to the deviation in measurements in galaxies?
And the equations I wrote down about the motion of the galaxies are found in every book and are not wrong.
Who even needs a supercomputer when the deviation between the expected measurements and the obtained measurements is so huge?
And the ASSOCIATION of Astronomy allows me to express my ideas and does not place me "at the forefront of scientific information"
And you chose a closing sentence: "At least you have to be fair and reliable enough to present the scientific truth as it is, and not as it appears from your unique point of view." End quote.
So for your information, this is exactly what I did in the first lecture and I presented the "scientific truth" as it is known to everyone in my first lecture. In my next lecture today is Thursday at the Mitzvah. I will analyze things the way things should be analyzed and everyone can decide if they want to accept the results of the analysis or ignore them.
You can continue to live with the dark mass and energy without any interference from me.
If you have things to do and are very busy right now, you don't have to come to my lecture. I will accept it with understanding
Good night Yael
Sabdarmish Yehuda
deer,
Fun
First of all Yael,
Thank you very much for the article - it has been a long time since an article on astrophysics has been published - probably because you are busy - so again, thank you.
age,
There are no galaxies with gas clouds and galaxies without gas clouds. In all galaxies there are such gas clouds - these are actually large cold gas blocks of hydrogen and helium from which, under certain conditions (after gravitationally collapsing) ordinary stars like our sun will be formed.
These gas clouds move through the galaxy like any other massive object and by chance such a cloud may come close to the black hole.
Under the influence of the black hole, the cloud is torn apart and the gas begins to adsorb to the black hole.
During the process of adsorption to the black hole, a lot of energy is emitted - to the order of tens of percent of the rest mass of the adsorbed gas (the exact number depends on the type of black hole, but it ranges from about 6 percent to 42 percent) - for comparison in the most efficient nuclear processes Of the type that exists in the stars - energy of the order of only about 0.1 percent is emitted. This whole process continues until there is no more gas left (everything that was the cloud is swallowed) and then the galactic center no longer shines - and ceases to be an active galactic nucleus.
According to this model, the question of whether the galactic nucleus is active or not, depends only on the question of whether it happens to be present at the time when we look at it in the midst of the process of absorbing material from a gas cloud or not.
Gas clouds in any case are found in every galaxy and as evidence in our galaxy there are such clouds in abundance and yet our galactic nucleus is not active
And what is different between galaxies with gas clouds and those without?
Age? or something else?
Or that there are some types of galaxies in which the material turns into stars and those that don't?
And so we have galaxies with existing gas clouds and those that don't, or it's a matter of process and a galaxy can be like this and then change state depending on the distribution of the matter inside it.
Yehuda,
I'm sure that if you delve a little deeper into my arguments, you'll understand how the scientific method works, and why theories like relativity, MOND and dark matter are considered scientific, while theories like "the density of particles (which you call dust) that affects the movement of galaxies" are not considered scientific. And it is not even considered an educated guess of how nature works. What you present is more in the nature of faith and less in the nature of science.
Besides, the equations you presented are incorrect. If you really wanted to calculate the equations of forces or energy of the movement of the galaxies, you would need a supercomputer with insane computing power, to calculate some approximation of the momentum and speed that each star has in three-dimensional space in different directions (after all, not all stars move in the same plane of the galaxy, You have displacement in all directions). You treated the whole galaxy as if it were a pointless body without volume rotating at the same speed. You might say that the galaxy has a common center of mass, but even if you do, then again you have to factor in all the force calculations. And if you claim that you took raw data from NASA, then you should also have added all kinds of relative adjustments. Your equations are just wrong. Remember that you tried to send me an article with power calculations before and I didn't have time to review it, you are welcome to send me again now, and I will show you which equations you need to correct.
I will try to make it to the lecture, but I am in a very busy period at the moment. In any case, I find it a bit jarring that the Israeli Astronomical Society places you at the forefront of scientific information when it comes to dark matter. And if you're being put on the spot, then at least you should be fair and reliable enough to present the scientific truth as it is, and not as it appears from your unique point of view.
The thought is not exactly new.
Even here in science, articles and comments have been published showing that this is a predictable phenomenon and even one that is looked for when encountering an active core.
For example in this article:
https://www.hayadan.org.il/galaxy-collision-switches-on-black-hole-1412091/
And in this article:
https://www.hayadan.org.il/nasas-swift-finds-smoking-gun-of-black-hole-activation-2905105
rationalize
It was very enjoyable to talk to you about the dark mass in the astronomical observatory at km 101.
To remind you that tomorrow Thursday 15.7.2010 at 21:30 I am lecturing on this topic at the Observatory in Givatayim. Everybody is invited. Cost 15-25 NIS. Free for members of the Israeli Astronomical Society.
Good Day
Sabdarmish Yehuda
There are galaxies in which the core is much brighter than in other galaxies.
The reason is, as the researchers discovered, gas clouds that migrate to the core and form new stars. This causes increased activity and a lot of radiation emission compared to other galaxies where there are no gas clouds.
A. Ben Ner
"Clouds of gas with a mass millions of times greater than the sun migrate to the center of the galaxy, they can be swallowed by the supermassive black hole that resides there, or through certain triggers they can be a maternity center for new stars."
"For some time, astrophysicists knew that gas clouds fall into galaxies, and also knew that active galactic cores are powered by gas falling into supermassive black holes"
"But no one has connected the two ideas until now, and said 'hey, maybe one causes the other'! ".
Massive gas clouds move in their orbit towards the center of the galaxy.
If these clouds have a very large mass, they can also be a source of new star formation in their area (in the area of the black hole, which is also an active galactic nucleus or not - depending on the amount of material in the gas clouds that fall into it).
At least that's what I understood.
I admit that I did not understand the idea of the article and article.
A]. What is the problem raised?
B]. Certainly not the proposed explanation for the problem (which I did not understand).
Or her name it seems so trivial to the point of "resembling incomprehensibility"