The small galaxy that orbits the Milky Way has a huge black hole in its center and looks comparable to the much larger Milky Way itself. Scientists don’t know why.
Leo I Dwarf Galaxy, about 820,000 light-years Earth, Totally only about 2,000 light-years. So far, astronomers have thought that the mass of galaxies is about 15 to 30 million times the mass of our Sun.that is Milky Way, It is estimated to weigh 1.5 trillion suns, and its disc width is over 100,000 light-years.
Surprisingly, I’m sitting in the center of a little Leo Black Hole New research has found that it is about the same size as the one in the center of the entire Milky Way. This finding is disappointing, as astronomers believed that a giant black hole would grow from an intergalactic collision and correspond to the size of the galaxy.
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“There is no explanation for this type of black hole in a dwarf spherical galaxy,” said Maria Jose Bustamante, a graduate of the University of Texas at Austin’s Doctor of Astronomy and lead author of the new paper. In the statement.
The discovery was rather a coincidence. Scientists initially attempted to measure the amount of dark matter in Leo I using the Virus-W instrument at the 2.7-meter Harlan Telescope at the University of Texas McDonald’s Observatory. Virus-W measures the movement of stars in a small galaxy around the Milky Way, Dark matter From those movements in those galaxies.Dark matter is a mysterious invisible that counteracts the power of gravity.. Scientists can measure their concentration in space based on their impact on the orbit and velocity of nearby stars. The more dark matter in a star’s orbit, the faster it will move.
When the team ran the data collected from the observations through a computer model, they found that Leo I was essentially free of dark matter and appeared to have as many as 3 million sun black holes in the center. (NS Sagittarius A * The black hole in the center of the Milky Way galaxy is only 25% larger. )
“You have a very small galaxy falling in the Milky Way, and its black hole is about as large as that of the Milky Way,” said the University of Texas at Austin, an astrophysicist and new co-author. Karl Gebhart said in a study, statement. “The mass ratio is absolutely large.”
The results differ from previous calculations of the dark matter of the Leo I galaxy, an astronomer recognized in the statement. Earlier studies were based on inaccurate data and they said they could not access powerful supercomputers like the Austin team.
In previous studies, scientists did not look at the denser interior areas of the galaxy, but mainly focused on accessible information about some individual stars. However, these datasets appeared to contain a disproportionate number of slow stars. Calculations based on these biased datasets failed to reveal dark matter in the inner regions. In the case of Leo I, the amount of dark matter in the center that was previously invisible appears to be much higher than the amount of dark matter in the periphery.
the study It was published in the Astrophysical Journal on December 1st.
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