? What is in the center of our galaxy
Galactic Center
The observer sees the center of the galaxy (the Milky Way) in a constellation called Sagittarius
He hides behind thick dark clouds that directly obscure his vision
And monitor it in the visible light range.
During the last half century, astronomers began
Observation of the Galactic Center by
radio telescopes
infrared telescopes
and X-ray probes
It provided us with data and images that help in understanding and visualizing the center of the galaxy and the nearby area.
radio rays
At the center, astronomers found a powerful source that radiates radio waves
And their name is (Army A*)
Those rays come from a small and specific region in the center of the galaxy
In that region, there are huge clusters of stars that are stacked and confined
In a rather narrow region, about 1 light-year in diameter, it revolves around the pulsating and radiant center with extremely fast cycles of 100 years.
Giant stars around a supermassive black hole
Moreover, they found a supermassive black hole of about 1,300 solar masses around which stars revolve.
The closest star to the center orbiting this black hole is the star S2, which is 17 light-hours away from the center of the galaxy in a cycle of 2 and 15 years.
Scientists have been able to accurately determine its trajectory through a complete cycle.
They conclude from the movement of the stars in central cycles that they must exist in that region
Its width is about 15 million km, and its mass is estimated at about 3-4 million solar masses, at least.
The research was published in 2009 and the plausible explanation is consistent with seeing this massive pool of material
There must be a super-strong black hole at the center of the galaxy.
E releases gamma rays
On November 9, 2010, astronomer Doug Finkbanner of the Harvard Center discovered it
- The Smithsonian Astronomical Research Center has detected two huge bubbles of high energy
They run from the center of the galaxy to the north and south.
This was also detected by the Fermi Gamma Ray Space Telescope.
The bubble is about 25,000 light-years in diameter and extends through space in the south from the constellation Virgo to the constellation Crane.
Its interpretation remains ambiguous.
The size of the Milky Way
You can visualize the enormity of our Milky Way, with its 100 billion to 300 billion stars, when measured on a scale of 1017:1.
If the galaxy is equal to a disk with a diameter of 10 km and a height of 1 km
On average, it is occupied by 200 billion germs, each cubic meter of which would contain 3 germs
The sun would have been a germ with a scale of 10 nanometers.
Even Pluto's orbit would have been 0.1 millimeters,
And Pluto itself would be as small as the Earth to be the size of a single atom.
From this it becomes clear how the density of stars in the galaxy is very small and the distances between them are enormous
Older and older stars near the center
The parsec around Sagittarius A* contains thousands of stars.
Although most of them are old red stars that follow the basic layout
The center of the galaxy is rich in stars with super giant giants of massive mass.
Among them, there are about 100 stars of the Wolf-Rayet star type and stars of the star classification OB.
They all appear to have been formed during a single star-forming process in the beginning millions of years ago.
unexpected surprise
The presence of these newly emerging stars was a surprise to scientists, as scientists believed that the tidal forces emanating from the supermassive black hole would prevent the formation of stars.
This contradiction, which exists with regard to the presence of new emerging stars in the center of the galaxy, captures the astonishment of scientists, especially those stars that revolve in narrow orbits around Sagittarius A*
Like the star S2.
It is also surprising that most of these 100 new stars have large masses
They appear to be concentrated in one disc (according to one scientific group, UCLA)
Or maybe in two discs (according to the group of scientists from the Max Planck Institute for Astrophysics)
That is, it seems that these giant stars are not randomly distributed over the parsec in the center of the galaxy. But these observations are still far from a definite chapter in that, and perhaps in the near future more secrets will be revealed.
Source: websites