会议专题

Star formation and stellar winds around the Galactic super-massive black hole

We present our work to study the origin of the massive stars observed close to Sgr A, the Galactic super-massive black hole, and the dynamics of the massive stars winds. We argue that the stars were formed in a~10<4>M<,??> accretion disc that existed around Sgr A in the past. We find that the stellar dynamics constrain the total mass of the stellar population, requiring the mass function to be dominated by massive stars. We present a numerical study of star formation in a massive disc and show the influence of radiative cooling on the resulting mass function. We also present simulations of the accretion of stellar winds onto Sgr A. We first discuss the strong influence of the stellar dynamics on the accretion onto the central black hole. From realistic simulations of Sgr A accretion we find that slow winds shock and rapidly cool, forming cold gas clumps and filaments that coexist with the hot X-ray emitting gas. The accretion rate is highly variable on time-scales of tens to hundreds of years. Such variability can lead to a strongly non-linear response through accretion flow physics, making Sgr A an important energy source for the Galactic centre.

Galactic centre stellar winds accretion star formation SPH

Jorge Cuadra

JILA, University of Colorado, Boulder, CO 80309-0440, USA

国际会议

紧凑型物体的天体物理学国际会议(International Conference on Astrophysics of Compact Objects)

安徽黄山

英文

348-354

2007-07-01(万方平台首次上网日期,不代表论文的发表时间)