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Search: authors:"Dong Zhang"

3 papers found.
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Impact of primordial ultracompact minihaloes on the intergalactic medium and first structure formation

The effects of dark matter annihilation on the evolution of the intergalactic medium (IGM) in the early Universe will be more important if the dark matter structure is more concentrated. Ultracompact minihaloes (UCMHs), which formed through dark matter accretion on to primordial black holes (PBHs) or an initial dark matter overdensity produced by a primordial density perturbation...

Radiation pressure-driven galactic winds from self-gravitating discs

We study large-scale winds driven from uniformly bright self-gravitating discs radiating near the Eddington limit. We show that the ratio of the radiation pressure force to the gravitational force increases with height above the disc surface to a maximum of twice the value of the ratio at the disc surface. Thus, uniformly bright self-gravitating discs radiating at the Eddington...

Self-similar structure of magnetized advection-dominated accretion flows and convection-dominated accretion flows

We study the effects of a global magnetic field on viscously rotating and vertically integrated accretion discs around compact objects using a self-similar treatment. We extend Akizuki & Fukue's work by discussing a general magnetic field with three components (r, ϕ, z) in advection-dominated accretion flows (ADAFs). We also investigate the effects of a global magnetic field on...