2002/08/09 by Kuiyun Huang, Huang, Kui-Yun, Ing‐Guey Jiang +1
Physics and Astronomy · Agricultural and Biological Sciences · #Galaxies: Formation, Evolution, Phenomena #Astrophysics and Cosmic Phenomena #Leaf Properties and Growth Measurement
paper · pdf · doi:10.48550/arxiv.astro-ph/0208195
It was proposed by Blitz et al. (1999) that High Velocity Clouds (HVCs) are remnants of Local Group formation and the average distance of HVCs is 1 Mpc, which is the result of a simple dynamical calculation leading to match the observed HVCs distributions. However, in this paper, we clearly show that fitting the observed HVCs distributions by a dynamical calculation cannot provide any constraints on the average distance of HVCs. With our choices of initial conditions, the observational results in Wakker & van Woerden (1991) are produced in our simulations for the models of both Galactic and extragalactic origins. Moreover, because Zwaan & Briggs (2000) reported that they failed to locate any extragalactic counterparts of the Local Group HVCs in a blind HI 21-cm survey of extragalactic groups, we propose to use ``remnants of galactic disc formation'' as the modification for the picture of ``remnants of galaxy group formation'' in Blitz et al. (1999) and thus reduce the possible average distances of HVCs to be about or less than a few hundred kpc.