We study different models of dark-matter distribution for the halo of our galaxy. Assuming that the dark matter is in form of MACHOs, we compute the expected number of microlensing events and their average time duration for an experiment monitoring stars in the LMC. The main effect of considering models with anisotropy in the velocity space is to reduce the microlensing rate by about 30% and to increase, but only slightly, the mean event duration, as compared to the standard spherical halo model. Consideration of different luminous models for the visible part of the galaxy also induce variations in the microlensing results by roughly the same amount as mentioned above.
An Upgrade of the Microlensing Rate
DE PAOLIS, Francesco;INGROSSO, Gabriele;
1997-01-01
Abstract
We study different models of dark-matter distribution for the halo of our galaxy. Assuming that the dark matter is in form of MACHOs, we compute the expected number of microlensing events and their average time duration for an experiment monitoring stars in the LMC. The main effect of considering models with anisotropy in the velocity space is to reduce the microlensing rate by about 30% and to increase, but only slightly, the mean event duration, as compared to the standard spherical halo model. Consideration of different luminous models for the visible part of the galaxy also induce variations in the microlensing results by roughly the same amount as mentioned above.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
