Something Far Stranger than a Black Hole Lurks at the Center of our Galaxy, New Hypothesis Claims

Something Far Stranger than a Black Hole Lurks at the Center of our Galaxy, New Hypothesis Claims

A new scientific hypothesis suggests something more basic: the center of the Milky Way has a larger origin of dark matter than a supermassive black hole. This may explain some of the peculiarities in current observations of the motions of stars centering on the core of our galaxy. The central object in our galaxy is Sagittarius A * (pronounced a star) or SGR A * for short. It is estimated to be a supermassive black hole weighing about 4.15 million times the mass of our Sun.

Evidence of this can be found in the motion of stars around the center of the galaxy, especially a star called S2, which was used to test Einstein’s general relativity. The motion of this star and the change of color at its nearest point to the SGRA * support this idea of ​​a very large and compact object like a black hole located at the core of the Milky Way.

The Milky Way has known to feed on its neighbors for billions of years, slowly but surely merging with many dwarf galaxies that surround our galaxy. The remnants of such interactions can see today in the form of stellar streams wrapped around the galaxy like ribbons. A newly discovered "ribbon" is the Jhelum stellar Stream. Because of its location in the sky, astronomers considered the current to be part of a collision between the Milky Way and the Gaia-Enceladus-Sausage Dwarf galaxy, which thought to have occurred between 8 and 11 billion years ago. Now new observations have revealed that Jhelum does not come from the sausage dwarf galaxy above all. Astronomers were able to study the light spectrum of the stars in the Jhelum stream, which gave them an idea of ​​what the stars made of. The stars formed together will have a similar composition. It tracked using parts of the Apache Point Observatory Galactic Evolution Explorer (APOGEE) survey, Sloan Digital Sky Survey (SDSS). The combination, they have created and allows them to select related stars together by combining it with detailed information about their position and motion from the European Space Agency's Gaia has shown the team that the Jhelum stream does not match other evidence of sausage collisions. Its source was elsewhere. "Like fingerprints or tags, the chemical properties of the stars in a stream can be used to convey these exclusions to other streams - but more than that, the chemical makeup, position and speed are incredibly valuable to keep together and just to show off the benefits of a combination of APOGE and gear." Professor Alison Sheffield, a veteran author at LaGuardia Community College, said in a statement. The Jhelum stream is only observable from the Southern Hemisphere, so thanks to the Southern APOGEE instrument (APOGEE-2) coming online, the team was able to identify the right stars and then find out who the actual members of the stream were online. Co-author Aidan Subrahimovic, an astrophysics student at City University of New York added, "Measuring the tracks or orbits of the stars in the stream allows us to go almost behind the cosmic clock, and reveal where the flow itself came from." Researchers have not been able to link the Jhelum stream to any dwarf galaxy or globular cluster with any specific attachment and therefore its source is currently unknown. However, future work researchers can help us find the answer to the source of these and other stellar streams in the Milky Way.
Something Far Stranger than a Black Hole Lurks at the Center of our Galaxy, New Hypothesis Claims

As the star orbits the black hole, its orbit shifts and the closest point the black hole changes with each turn. General relativity predicts exactly how much the orbit changes. An unusual class of objects known as the G-Class also orbits the Galactic Center and does not do them justice by calling them funny. They are objects like compact stars but if they are positioned close to SGRA * they look like extended- interstellar clouds.

They look like gas but act like stars. There are, however, some peculiarities of the motion of this object which have not yet been fully explained, which gives some leeway in considering the alternative of black holes. The new estimate, adopted for publication the MNRAS letter and available for reading as a preprint, contains ideas about what it could be. The team suggests that the compact object is not a black hole, but a dense root of a certain type of dark matter called ” darkinos”. 

The team claims that the speed of the S2 and one of the first discoverer G-class objects, the oddity of the G2 is a better fit for their dark matter core scene than a supermassive black hole. To further test this they added speed to other stars in the S class Found that they matched their model.