Changes in the magnetic field of supermassive black holes M87 are unexpectedly dynamic and large.Research has shown this through a virtual telescope that scientists have recently improved considerably.
The “non-existent telescope” EHT took new images of the supermassive black hole, located in the center of the M87 Galaxy. As it already has quality images – albeit a little less – from previous years,astronomers can show if the black holes are changing over time. And if so, how.
The M87 black hole lies about 55 million light-years from Earth. And describing it as supermassive is more than apt of scientists, as it has a weight of six billion suns. She was the first black hole she looked at: it happened in 2019, also using the telescope EHT. New images show how magnetic fields are changing near its singularity.
“It is noteworthy that while the size of the ring has remained consistent over the years, confirming the shadow of the black hole predicted by Einstein’s theory, the polarization formula is changing significantly,” commented the new shots of the Astronome for astrophysics at Harvard University. “This tells us that magnetized plasma swirling near the horizon of events is far from static; it is indeed dynamic and complex, which shifts our theoretical models on the limit of possibilities.”
As the black hole changed
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Images from different years show that between 2017 and 2021 the direction of polarization of the magnetic fields changed significantly. This indicates that the structure and intensity of the magnetic fields around the black hole are not constant but evolve over time. The changes are happening on a relatively short timescale, which is surprising given the immense size of the black hole.
Event Horizon Telescope Achieves Higher Resolution with Improved Sensitivity and Frequency Range
The Event Horizon Telescope (EHT), the instrument that captured the first image of a black hole, has significantly improved its capabilities, leading to new scientific results and posing new questions for researchers. This advancement stems from expanding the telescope’s frequency range and enhancing its sensitivity, allowing for higher resolution images.
The EHT: A Virtual Telescope
Unlike traditional telescopes with a single physical structure, the EHT is a network of radio antennas located around the globe. This network functions as a single, Earth-sized telescope through a technique called Very-long-baseline interferometry (VLBI) [https://eventhorizontelescope.org/about]. Because the EHT isn’t a single, locatable instrument, it cannot be found on a map in the traditional sense.
Increasing Resolution Through Frequency and Sensitivity
Astronomers have two primary methods for improving image resolution: increasing the distance between antennas or observing at higher frequencies. Since the EHT already utilizes antennas spread across the planet, the latter approach was pursued.
“To get higher resolution images, astronomers have two options – to increase the distance between radio antennas or observe at a higher frequency,” explains the EHT collaboration. [https://eventhorizontelescope.org/news/new-event-horizon-telescope-image-reveals-magnetic-fields-around-black-hole]
Expanding the frequency range, however, presented significant challenges.Scientists needed to drastically improve the telescope’s sensitivity, achieved through both more sensitive instrumentation and careful observation during ideal weather conditions at each participating station. This is the first time this has been successfully accomplished with the EHT.
recent Improvements and Future research
The improvements implemented last year were anticipated to yield a wealth of new data, and have indeed done so. The EHT collaboration continuously works to enhance the telescope through the addition of new telescopes,modernization of existing equipment,and the progress of innovative data processing algorithms.
“We improve EHT year after year – adding other telescopes and modernizing devices,coming up with new ideas for scientific research and new algorithms to get the data as much as possible,” stated the EHT team. [https://eventhorizontelescope.org/news/new-event-horizon-telescope-image-reveals-magnetic-fields-around-black-hole]
These combined efforts have not only produced new scientific findings but have also generated further research questions that will occupy scientists for years to come.Recent results include a new image of the supermassive black hole at the center of the Messier 87 galaxy, revealing the structure of magnetic fields around the black hole [https://eventhorizontelescope.org/news/new-event-horizon-telescope-image-reveals-magnetic-fields-around-black-hole].
date:2024-02-29 07:03:00 (Updated to reflect current date and facts)