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Right here There Be DRAGNs – Nationwide Radio Astronomy Observatory

January 11, 2024
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Right here There Be DRAGNs – Nationwide Radio Astronomy Observatory
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Lively supermassive black holes typically produce highly effective jets of ionized fuel that stream away from their host galaxies. These jets might be seen by radio telescopes as radio lobes. Lively galaxies can have one or two radio lobes, and once they have two they’re often known as Double-lobed Radio sources related to Lively Galactic Nuclei, or DRAGNs. The jets of most DRAGNs are symmetrical, however a number of aren’t. These asymmetrical DRAGNs might inform us an amazing deal about galaxies and their surrounding atmosphere, however figuring out them generally is a problem.

College of the West Indies scholar Kavita Gosine Bissessar needed to seek out these asymmetrical DRAGNs, so she began with a catalog of 17,724 DRAGNs captured by the Very Giant Array Sky Survey (VLASS). She mixed this with infrared knowledge from the Broad-field Infrared Survey Explorer (WISE) to determine their host galaxies. From this Kavita discovered that 1,587 of them had confirmed galactic cores.

An asymmetrical DRAGN as seen within the VLA Sky Survey.

However to seek out out which of those have been asymmetrical, Kavita needed to comb by way of them by hand. She began by measuring the arm-core distance ratio since DRAGNs with bigger ratios usually tend to be symmetrical. She discovered that 33 of them had ratios better than 3.6. Curiously, she discovered that these with the most important ratios appeared asymmetrical, however have been truly false positives. Some have been truly two separate galaxies, whereas others had shiny radio cores misidentified as a lobe. Kavita discovered that DRAGNs with arm-core distance ratios between 3 and eight had the best likelihood of being true asymmetrical DRAGNs.

This end result can assist astronomers discover galaxies with uneven radio lobes extra simply. Sooner or later Kavita want to examine the environments of those galaxies to see how that may have an effect on galactic lobe symmetry.



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