See what can’t be seen
The team combined two cosmic technologies to detect the black hole: gravity observation and astrometry. The first step is because as gravity changes over time, it changes the way the light travels when it approaches. When a celestial being moves very close to a star that is farthest from our line of sight, the light of the star is extinguished as it travels beyond the nearest object. If the first thing that makes the node – say, a planet, a star, or black, is smaller than the entire galaxy – the process is called microlensing.
Microlensing uses something almost like a real magnifying glass, to slightly illuminate the light of a distant star – the end result telescopes can capture. Astronomers can compare the size of the object close to the length of the star’s light; More important ones perform long microlensing events. So a long microlensing process performed by something we can’t see could signal a rogue black hole.
But black holes cannot be detected by microlensing alone. A small star that moves slowly like a black hole can be straightened out. It is also a long sign, because of its brightness, and if the star is dim, the stars cannot see it, it is possible to see the light from the last star.
That’s where the star enters. This technique involves making accurate measurements of the position of an object. By seeing how much the position of the last star moves during the microlensing event, astronomers can see exactly how close it is.
“That’s how we knew we had a black hole,” Sahu said. “We saw a lot of things when there were stars shining; But we know not the light of it.
This knowledge is the result of seven years of observation. Microlensing samples can show small black holes for up to one year. Two global telescopes, the Optical Gravitational Lensing Experiment (OGLE) and the Microlensing Observations in Astrophysics (MOA) telescope, were taken to the event. Astronomers have long thought that a lens may have a black hole.
That’s when they started making astrometric measurements. There is very little movement in the center of the light of the last star that the Hubble Space Telescope can detect. The company spent a few more years looking at the astrometric signal, and it was about five to 10 times longer than its microlensing counterpart.
“It’s really fun to be a part of that great experience,” Sahu said. “I have been looking for rogue black holes for ten years, and it is fun to find one! I think he was the first of many. “
Establish cosmic order
It may not be a black hole. Observing a different group of the same event puts the object at between 1.5 and 4 times the size of the sun – light enough to become a black hole or a neutron star (the cause of pain). a dead star that is not large enough (becomes a black hole). Considering that astronomers don’t see one single neutron star more than another, this is surprising. The results of the two groups are being examined.
With this in mind, some astronomers think that the stellar-mass black holes found in binary systems may be a sign of things. They range in size from 5 to 20 times the daily volume, weighing in at about 7 pounds a day. But the real scope is much wider.
“The massive black holes seen in other galaxies by gravity waves are much larger than what we find in our galaxy – up to about 100 times the size of the sun, “said Sahu. “Having the other things separated, it will be better to understand what the number of the real black hole is and to learn more about the spirits associated with our galaxy. “