Fig. 7.

Left: model image of a semi-analytic ADAF model of Sgr A* (Broderick et al. 2011), contours of 25, 50, and 75% of the peak flux density are shown in white. Right: tests of the second moment regularizer using the true image parameters as input (θmaj = 58 μas, θmin = 52 μas, ϕ = 177° as measured directly from the model image), χ2 values are calculated for the data set without the LMT. We additionally give the resulting source size parameters for each reconstruction. Imaging of the example data set with full EHT 2017 coverage shows little difference between the imaging process with and without the second moment regularizer. When the LMT is removed, and thus the mid-range baseline no longer constrains the source size, ℛΣ greatly improves the imaging. It should be noted that differences in finer features imaged with and without LMT are expected due to the loss of some long-baseline information from the removal of the LMT.
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