Marrakesh, 25 February. (Moroccan-news) –
In a binary system, the axis of rotation of a black hole is tilted by more than 40 degrees with respect to the axis of the stellar orbit. This discovery challenges the model of black hole formation.
observations made by researchers of Tuorla Observatory in Finland It is the first reliable measurement to show a large difference between a black hole’s axis of rotation and the axis of a binary system’s orbit. MAXI J1820+070 . The difference between the axes measured by the researchers in a binary star system called was over 40 degrees.
Often, the axis of rotation of a central giant body is largely aligned with the axis of rotation of its satellites. This is the case for the Solar System: the planets orbit the Sun in a plane that roughly coincides with the Sun’s equatorial plane. The inclination of the Sun’s rotational axis with respect to the Earth’s orbital axis is only 7 degrees.
“The expected alignment is, to a large extent, not correct for strange objects, such as black hole X-ray binaries. Black holes in these systems were formed after a cosmic cataclysm: the collapse of a massive star. We now see that black holes The hole is attracting matter from a nearby, lighter companion star, which orbits around it. We see luminous optical and X-rays like the last gasp of falling matter, as well as radio waves from the relativistic jet ejected from the system. emissions,” he explains. in a statement Juri Poutanen, Professor of Astronomy at the University of Turku and lead author of the publication.
By tracking these jets, the researchers were able to accurately determine the direction of the black hole’s spin axis. When the amount of gas falling into the black hole from the companion star began to decrease, the system darkened and most of the light in the system came from the companion star. due to which, The researchers were able to measure the inclination of the orbit using spectroscopic techniques, and it roughly coincided with the inclination of the ejection.
“To determine the 3D orientation of the orbit, it is also necessary to know the angle of the system’s position in the sky, that is, how the system rotates with respect to the direction of north in the sky. We measured this using polarimetric techniques,” Juri Potanen explains.
Result, Science. Posted inThis open interesting perspectives for studies on the formation of black holes and the evolution of these systems, as such extreme misalignment is difficult to achieve in many scenarios of black hole formation and binary evolution.
, The difference of more than 40 degrees between the orbital axis and the black hole’s rotation was completely unexpected., When modeling the behavior of matter in the curved spacetime around a black hole, scientists have often taken this difference to be too small, And now, new discoveries force us to add a new dimension to them. Potanan said.
The key discovery was made using the DIPOL-UF polarimetric instrument, which was built in-house and mounted on the Nordic Optical Telescope, which is owned by the University of Turku and Aarhus University in Denmark.
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