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3rd December 2019, 00:30
Chinese Scientists Discover a Black Hole That Shouldn't Exist
MR3TdSeaCUQ
A wide star–Black-Hole (https://www.nature.com/articles/s41586-019-1766-2) binary system from radial-velocity measurements
All stellar-mass black holes have hitherto been identified by X-rays emitted from gas that is accreting onto the black hole from a companion star. These systems are all binaries with a black-hole mass that is less than 30 times that of the Sun1 (https://www.nature.com/articles/s41586-019-1766-2#ref-CR1),2 (https://www.nature.com/articles/s41586-019-1766-2#ref-CR2),3 (https://www.nature.com/articles/s41586-019-1766-2#ref-CR3),4 (https://www.nature.com/articles/s41586-019-1766-2#ref-CR4). Theory predicts, however, that X-ray-emitting systems form a minority of the total population of star–black-hole binaries5 (https://www.nature.com/articles/s41586-019-1766-2#ref-CR5),6 (https://www.nature.com/articles/s41586-019-1766-2#ref-CR6). When the black hole is not accreting gas, it can be found through radial-velocity measurements of the motion of the companion star.
Here we report radial-velocity measurements taken over two years of the Galactic B-type star, LB-1. We find that the motion of the B star and an accompanying Hα emission line require the presence of a dark companion with a mass of 68+11−13 solar masses, which can only be a black hole. The long orbital period of 78.9 days shows that this is a wide binary system.
Gravitational-wave experiments have detected black holes of similar mass, but the formation of such massive ones in a high-metallicity environment would be extremely challenging within current stellar evolution theories.
Source (https://www.nature.com/articles/s41586-019-1766-2)
Scientists may have discovered whole New Class (https://www.sciencedaily.com/releases/2019/10/191031154923.htm) of Black Holes
We’ve found a Black Hole that may be smaller (https://www.newscientist.com/article/2221999-weve-found-a-black-hole-that-may-be-smaller-than-any-ever-seen-before/) than any ever seen before
Scientists Discover That This Baffling Black Hole Is Way Smaller (https://www.newsweek.com/black-hole-mass-galaxy-1443133) Than They Thought It Was
What If a Tiny Black Hole Appeared Next To Earth?
l57JTye0JLg
MR3TdSeaCUQ
A wide star–Black-Hole (https://www.nature.com/articles/s41586-019-1766-2) binary system from radial-velocity measurements
All stellar-mass black holes have hitherto been identified by X-rays emitted from gas that is accreting onto the black hole from a companion star. These systems are all binaries with a black-hole mass that is less than 30 times that of the Sun1 (https://www.nature.com/articles/s41586-019-1766-2#ref-CR1),2 (https://www.nature.com/articles/s41586-019-1766-2#ref-CR2),3 (https://www.nature.com/articles/s41586-019-1766-2#ref-CR3),4 (https://www.nature.com/articles/s41586-019-1766-2#ref-CR4). Theory predicts, however, that X-ray-emitting systems form a minority of the total population of star–black-hole binaries5 (https://www.nature.com/articles/s41586-019-1766-2#ref-CR5),6 (https://www.nature.com/articles/s41586-019-1766-2#ref-CR6). When the black hole is not accreting gas, it can be found through radial-velocity measurements of the motion of the companion star.
Here we report radial-velocity measurements taken over two years of the Galactic B-type star, LB-1. We find that the motion of the B star and an accompanying Hα emission line require the presence of a dark companion with a mass of 68+11−13 solar masses, which can only be a black hole. The long orbital period of 78.9 days shows that this is a wide binary system.
Gravitational-wave experiments have detected black holes of similar mass, but the formation of such massive ones in a high-metallicity environment would be extremely challenging within current stellar evolution theories.
Source (https://www.nature.com/articles/s41586-019-1766-2)
Scientists may have discovered whole New Class (https://www.sciencedaily.com/releases/2019/10/191031154923.htm) of Black Holes
We’ve found a Black Hole that may be smaller (https://www.newscientist.com/article/2221999-weve-found-a-black-hole-that-may-be-smaller-than-any-ever-seen-before/) than any ever seen before
Scientists Discover That This Baffling Black Hole Is Way Smaller (https://www.newsweek.com/black-hole-mass-galaxy-1443133) Than They Thought It Was
What If a Tiny Black Hole Appeared Next To Earth?
l57JTye0JLg