Day: March 31, 2021

M87s Central Black Hole in Polarized Light

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To play on Carl Sagan’s famous words “If you wish to make black hole jets, you must first create magnetic fields.” The featured image represents the detected intrinsic spin direction (polarization) of radio waves. The polarizationi is produced by the powerful magnetic field surrounding the supermassive black hole at the center of elliptical galaxy M87. The radio waves were detected by the Event Horizon Telescope (EHT), which combines data from radio telescopes distributed worldwide. The polarization structure, mapped using computer generated flow lines, is overlaid on EHT’s famous black hole image, first published in 2019. The full 3-D magnetic field is complex. Preliminary analyses indicate that parts of the field circle around the black hole along with the accreting matter, as expected. However, another component seemingly veers vertically away from the black hole. This component could explain how matter resists falling in and is instead launched into M87’s jet. via NASA https://ift.tt/2PmPRkz

Wikipedia article of the day for March 31, 2021

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Wikipedia article of the day is Lou Spence. Check it out: https://ift.tt/2zyOIMi Summary: Lou Spence (1917–1950) was a fighter pilot and squadron commander in the Royal Australian Air Force during World War II and the Korean War. In 1941 he was posted to North Africa with No. 3 Squadron, which operated P-40 Tomahawks and Kittyhawks; he was credited with shooting down two German aircraft and earned the Distinguished Flying Cross (DFC). He commanded No. 452 Squadron in 1944, flying Supermarine Spitfires in defence of Australia’s North-Western Area against the Japanese, and was mentioned in despatches. In February 1950 he took command of No. 77 Squadron, operating P-51 Mustangs as part of the British Commonwealth Occupation Force in Japan. He led his squadron in the opening months of the Korean War, and was awarded a bar to his DFC, as well as the US Legion of Merit and the US Air Medal, for his leadership. Spence was killed during a low-level mission over South Korea in September 1950.