A new snapshot of a black hole reveals its mysterious physics


Two years ago, Event Horizon Telescope (EHT) first made headlines with its announcement directly Fig A black hole science magazine named the image after it Breakthrough of the year. Now the EHT collaboration is back with the result of an earthquake: a new image of the same black hole, this time showing how it looks in polarized light. The ability to measure that polarization for the first time – the signature of the magnetic field at the edge of a black hole – is expected to gain new insights. Black hole Gable the substances and emit powerful jets from their cores. Was described in the new inquiry Three Papers Published Inside Astrophysical Journal Letters.

“This work is a major milestone: the polarization of light carries information that allows us to better understand the physics behind the image we saw in April 2019, which was not possible before,” said Evan Marte-Vidal, assistant coordinator of EHT Polarymetry. Working group and researchers at the University of Valencia, Spain. “Due to the complex techniques involved in data retrieval and analysis, this new polarized-light image has been unveiled year after year.”

Produced multiple imaging methods The first direct image ever taken A black hole in the center of an elliptical galaxy. Located about 55 million light-years away in the constellation of Virgin, the galaxy is called Messier 87 (M87). There were collaborative searches Published on April 10, 2019, Featured in six different papers Astrophysical Journal Letters. It was a feat that was possible only a generation ago, possible, Technological advancement, Innovative new algorithms and of course combines several of the best radio observations in the world. The image confirms that the object in the center of the M87 is indeed a black hole.

The EHT captured photons stuck in orbit around the black hole, orbiting around the speed of light and creating a bright ring around it. From this, astronomers were able to infer that the black hole was rotating clockwise. The imaging revealed the shadow of a black hole, a dark intermediate region. As close as that shadow was, astronomers were able to take pictures of real black holes, from which light could not escape after the event crossed the horizon. And just as the size of the event horizon is proportional to the mass of the black hole, so is the shadow of the black hole: the larger the black hole, the larger the shadow. (The mass of the M87 black hole is 6.5 billion times that of our Sun.) This was a stunning confirmation of the general theory of relativity, which shows that these predictions also exist in the ultimate gravitational environment.

What was lacking, however, was the insight into the process behind the powerful dual jets produced by the blackhole, with a fraction of this material coming out at almost light speeds. (The blackhole at the center of our Milky Way is less Raven, i.e., relatively quieter than the M77 black’s blackhole. These new results compress the possibilities surrounding various competing theories and place additional obstacles around it.)

Polarized sunglasses similarly reduce glare from bright surfaces, while polarized light around a black hole provides a sharper view of the region around it. In this case, the polarization of light is not due to special filters (like sunglasses lenses) but to the presence of magnetic fields in the warm region of space surrounding the black hole. This polarization enables astronomers to map the lines of the magnetic field at the inner edge and study the interaction between matter flowing in and outward.

“Observations suggest that the magnetic fields at the edge of the black hole are strong enough to push behind the heated gas and help it resist gravitational pull. The gas slipping through the cable field can swell inside the event horizon.” Assistant Jason Dexter says Boulder, of the University of Colorado, who is also the coordinator of the EHT Theory Working Group, said that ator is the only theoretical model that accurately describes what EHT has observed, including the properties of magnetic gas.

This story originally appeared Ars Technica.


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