Usual stuff about imaginary dark matter. The image supplied in the article taken from the paper does not look like the original halo predictions for dark matter. Better fit is to a model that has gamma rays scattering off intervening dust clouds.
We know X-ray rings show that X-rays can scatter from intervening dust or gas clouds. As can gammarays (Rayleigh scattering). If one looks at the red part of image showing the purported signs of a dark matter “halo” it seems to follow the undulations of the blue part of the image. Most likely the blue in the image is the distribution of dust or gas and the excess gammarays are scattered as in Rayleigh scattering.
In other words…No imaginary dark matter is needed to explain the excess gammarays observed. Not least because other research shows visible mass can accurately model the rotation curves of galaxies without invoking imaginary dark matter.
