Hubble: How can a separate black hole ‘travel’ through the galaxy – News

Hubble: How can a separate black hole ‘travel’ through the galaxy – News

Wandering alone. Detached These are the interpretations of the stellar black hole found flowing through the galaxy.

Precisely, 5,000 light-years from the earth and the carina-Sagittarius spiral carries at a speed of 160,000 kilometers per hour. And, like him, about 100 million such objects – without any stars – would be “traveling” through our galaxy.

According to NASA, the US space agency, the discovery of the first isolated black hole is the result of the analysis of two teams of researchers who studied data obtained by the Hubble Space Telescope for six years.

Brazil is one of the groups led by Kailash Sahu of the Space Telescope Science Institute in Baltimore.

The second group is led by Casey Lam of the University of California. Both used gravitational microlensing techniques.

This technique involves observing the brightness amplification of a background star (called a source) (called a lens). An object passes between the observer and the source. The lens distorts the space-time around it and the light from the source is then distracted, thus increasing its brightness for the observer.

” In this case, the black hole passing between the observer and the background star acts as a lens and increases the brightness of the source for more than 200 days (the period during which the incident was observed). His location changed. Astronomy ”, explains astronomer Leonardo Almeida.

“I remember this microlens well. It was so bright that it was possible to observe it using a small telescope at the Pico dos Dias Observatory in Brazzopolis, Minas Gerais. It was necessary to measure the deflection of light from a background star using astrometry, “says Almeida, a professor at the Federal University of Rio Grande do Norte.

The Berkeley team understands that it could still be a neutron star, with unique fingerprints in the star’s changing light that could outperform other potential gravitational lensing candidates, according to NASA.

A study led by Sahu showed that the deflection of a lens passing in front of a star points to an object seven times the mass of the Sun.

“The mass obtained, including not detecting luminosity from the lens, indicates a potential lensing object, a black hole of stellar origin. It is not possible to say for sure. However, it is certain that this phenomenon is not only proven once again. Albert Einstein’s theory was correct once again, but it also opens an important window for us to better understand these objects and the elements of our galaxy “, Leonardo Called Almeida.

Stellar black hole

According to NASA, stellar-mass black holes have been known since the early 1970’s, but all of their mass measurements – to date – have been in binary star systems. The gas of the companion star falls into the black hole and heats up to such a high temperature that it emits X-rays.

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