The giant black hole in the nearby galaxy eats its host star to death

There is a beginning for everything. Even black holes.

Last week we talked about a newcomer “quiet” black hole within a globular cluster called NGC 1850, located in a nearby galaxy. Approximately 11 times the mass of the sun, the cosmic paste is locked in orbit with another star in the binary system. But while it doesn’t show the levels of typical predation of a black hole on its poor space star satellite, it will eventually eat it alive as the dance of death continues until there is nothing left but a clean core that slowly fades into a white dwarf, according to the study. originally shared on a prepress server.

And studying young black holes like this could go beyond revealing the early evolution of black holes: It could also significantly improve our ability to detect black holes at different stages of their first steps, both feeding and “Sleeping”.

A young black hole feeds on a nearby sun-like star

No one can directly observe a black hole, which understandably makes it difficult to prove them. The best evidence we’ve found so far comes from binary systems, where a visible star is trapped in orbit by a colossal but unseen predator. Observations such as this have given astronomers a means of tracking and analyzing black holes through their influence on surrounding stars and other light sources. Although only a few observations have been made of non-interacting black holes moving through star clusters, due to the limitations inherent in non-feeding black holes.

Furthermore, direct detections have never been made by dynamic effects on the environment from black holes in star clusters, leaving the knowledge of how monstrous singularities develop in such high-density stellar media. So far. The study’s authors, led by Sarah Saracino of Liverpool John Moores University in the United Kingdom, finally discovered a black hole in a globular cluster (of stars) called NGC 1850, thanks to its interaction with a nearby star. Named NGC 1850 BH1, the object is relatively young, only about 100 million years old. But it’s big.

A childhood window on the evolution of the black hole

The newly discovered black hole is located in the Large Magellanic Cloud (LMC), a satellite galaxy on our own Milky Way. This latest discovery is part of a broader and systematic search for star-mass black holes in young and giant star clusters in the LMC using observations from the Multi-Unit Spectroscopic Explorer captured by ESO (understandably huge). telescope (VLT). The physics behind the new search includes variations in radial velocity. According to the study, binary consists of a black hole which has approximately 11.1 times the mass of the sun, combined with a main sequence exclusion star (MSTO), which is approximately 4.9 times the mass of the sun.

It is also semi-separate and has a period of about 5 Earth days, together with an orbital inclination of 38 °. In particular, researchers believe that the binary system will undergo an overflow of the Roche-Lobe when the accompanying star evolves after its phase of the main sequence. This will continue with “stable mass transfer and significant X-ray emission” as the distance between the binary element increases. “The mass transfer is likely to end when most of the donor star’s hydrogen shell dries out, is transferred to the satellite, or is lost by the system, leaving a helium star nucleus,” astronomers said in a press release. “If so, it will probably go through another phase of mass transfer (and X-rays) when the star burns helium in a shell, ending up as a black hole + white dwarf system. In other words, the young black hole will continue to feed until its companion is reduced to the soft glow of a dying star: white dwarf. This latest discovery may mark the beginning of a new study of young black holes while they are still in their “initial mass function”, the early eons immediately after their formation. If we could extend our analysis to more black holes at this early stage in their lives, we could improve our ability to detect others. locked in the dance of death with close stars.

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