The removal of cusps from galaxy centres by stellar feedback in the early Universe

Article Abstract:

A mechanism using numerical simulations is proposed to confirm that random bulk gas motions expected to be present in all star-forming primordial galaxies have resulted in a flattening of the central dark matter cusp in galaxy centers in the early Universe. It is suggested that the natural source of energy for erasing the cusp is the energy of the stellar feedback, and observations support the theory by the presence of flat dark matter density profiles in galaxies in the present Universe.

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An early stellar nursery

Article Abstract:

The features of distant objects in the universe, especially J1148+5251 at a redshift of 6.4 are discussed. The observations on this object revealed the evolution of galaxies early in the history of universe.

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Dust-filled doughnuts in space

Article Abstract:

Infrared interferometry has revealed the first images of an extragalactic object. The doughnut-shaped cloud of dust is extremely close to the central black hole in the nearest powerful active galaxy.

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