"The black holes in orbit around each other. Both black holes have jets associated with them: the larger one with reddish color, and the smaller one with a yellowish color jet. Normally only the reddish jet is seen, but during the 12-hour period on November 12, 2021, the smaller jet dominated, and gave a direct signal from the smaller black hole, and was observed for the first time. Credit: NASA/JPL-Caltech/R. Hurt (IPAC) & M. Mugrauer (AIU Jena)" (ScitechDaily, NASA’s Planet Hunter’s Rare Glimpse at Two Black Holes in a Faraway Galaxy)
Researchers at the University of Turku found an interesting thing in the distant galaxy (OJ 287). These two supermassive black holes are orbiting each other. In that case, the lower-mass black hole covers a higher-mass black hole under its radiation.
That case happened during 12 hours period on November 12, 2021. When a smaller black hole came into the line between Earth and a larger black hole. There is the possibility that this kind of situation is stable if some other black hole turns a relativistic jet to the Earth and there is another black hole behind it.
The lower mass black hole shines brighter than the higher mass black hole, which sends red light. The supermassive black holes stretch light in longer distances than stellar black holes. In that galaxy, both black holes are supermassive. But the same model can escalate to stellar mass and massive and even to stellar mass and supermassive black holes.
The observed burst appears as a sharp flaring of the light curve from satellite observations, showing how an otherwise consistently dim object brightens suddenly and sharply. In the upper corner, the observed flaring is shown in more detail. The amount of light emitted in the burst is equivalent to the brightness of about 100 galaxies. Credit: Kishore et al. 2024. (ScitechDaily, NASA’s Planet Hunter’s Rare Glimpse at Two Black Holes in a Faraway Galaxy)
It's possible. The stellar mass black holes can form asymmetric binary black holes with much larger and more massive black holes. Same way other stars can form asymmetric binary stars between regular stars and red dwarfs. Same way red dwarfs can also orbit black holes.
That causes the effect that the lower mass black hole's transition disk is brighter in optical frequencies than the higher mass and dominating black hole. This thing causes vision that there can be more black holes in the universe than previously thought. The stellar mass black holes can shine brighter than massive and supermassive black holes. And they can cover more massive black holes under their shine.
The supermassive companion pulls material and radiation against the smaller black hole's transition disk. That causes an effect there smaller black hole's disk to shine brighter than it should. Those black holes pull radiation into them.
If another black hole's relativistic jet hits another black hole, that other black hole can pull that material into it. And that means that we cannot see that black hole behind it. Another case is that a relativistic jet hits another black hole's transition disk. That can raise the energy level of the transition disk to a very high level.
https://scitechdaily.com/nasas-planet-hunters-rare-glimpse-at-two-black-holes-in-a-faraway-galaxy/
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