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Sökning: WFRF:(Bray Justin D.)

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1.
  • Hewitt, Dante M., et al. (författare)
  • Milliarcsecond localization of the hyperactive repeating FRB 20220912A
  • 2024
  • Ingår i: Monthly Notices of the Royal Astronomical Society. - 0035-8711 .- 1365-2966. ; 529:2, s. 1814-1826
  • Tidskriftsartikel (refereegranskat)abstract
    • We present very long-baseline interferometry (VLBI) observations of the hyperactive repeating FRB 20220912A using the European VLBI Network (EVN) outside of regular observing sessions (EVN-Lite). We detected 150 bursts from FRB 20220912A over two observing epochs in 2022 October. Combining the burst data allows us to localize FRB 20220912A to a precision of a few milliarcseconds, corresponding to a transverse scale of less than 10 pc at the distance of the source. This precise localization shows that FRB 20220912A lies closer to the centre of its host galaxy than previously found, although still significantly offset from the host galaxy's nucleus. On arcsecond scales, FRB 20220912A is coincident with a persistent continuum radio source known from archival observations; however, we find no compact persistent emission on milliarcsecond scales. The 5σ upper limit on the presence of such a compact persistent radio source is 120 μJy, corresponding to a luminosity limit of (D/362.4 Mpc)erg s-1 Hz-1. The persistent radio emission is thus likely to be from star formation in the host galaxy. This is in contrast to some other active FRBs, such as FRB 20121102A and FRB 20190520B.
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2.
  • Jacquet, Jennifer, et al. (författare)
  • Support US OCTOPUS Act to keep octopuses wild.
  • 2024
  • Ingår i: Science (New York, N.Y.). - 1095-9203. ; 385:6710, s. 721-722
  • Tidskriftsartikel (refereegranskat)abstract
    • Commercial octopus farming is incapable of meeting welfare requirements, unsustainable, and unnecessary for sustenance. Although no commercial octopus farms currently exist, a Spanish seafood company plans to build one in the Canary Islands for Octopus vulgaris. In March, the US state of Washington banned octopus farming. Similar legislation has been introduced in California and Hawai‘i . Now, the federal government is proposing action. The US Congress should pass the OCTOPUS Act, a federal law that would prohibit commercial octopus aquaculture in the United States and the import of commercially farmed octopus or octopus products.
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