Figure 10 - available via license: Creative Commons Attribution-ShareAlike 4.0 International
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Images of M87 made by combining 227.1 GHz and 229.1 GHz EHT data using an annulus starting model, but for the four days separately, from April 5 to April 11, 2017. The CLEAN box is the same as that used in Figure 9. The contour levels are the same in all images, being a geometric progression in √ 2, starting at 2 mJy beam −1 . Negative contours are dashed. The greyscale range is -0.001 mJy beam −1 to 45 mJy beam −1 . The restoring beam is a Gaussian of FWHM = 22µas × 16µas, with a major axis position angle = 25 • .
Source publication
We present a reanalysis of the EHT 228 GHz observations of M87. We apply traditional hybrid mapping techniques to the publicly available `network-calibrated' data. We explore the impact on the final image of different starting models, including: a point source, a disk, an annulus, a Gaussian, and an asymmetric double Gaussian. The images converge t...
