Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-04-29
Mon.Not.Roy.Astron.Soc. 356 (2005) 1127
Astronomy and Astrophysics
Astrophysics
7 pages, 4 figure
Scientific paper
10.1111/j.1365-2966.2004.08540.x
The main aim of microlensing experiments is to evaluate the mean mass of massive compact halo objects (MACHOs) and the mass fraction of the Galactic halo made by this type of dark matter. Statistical analysis shows that by considering a Dirac-Delta mass function (MF) for the MACHOs, their mean mass is about that of a white dwarf star. This result is, however, in discrepancy with other observations such as those of non-observed expected white dwarfs in the Galactic halo which give rise to metal abundance, polluting the interstellar medium by their evolution. Here we use the hypothesis of the spatially varying MF of MACHOs, proposed by Kerins and Evans to interpret microlensing events. In this model, massive lenses with a lower population contribute to the microlensing events more frequently than do dominant brown dwarfs. This effect causes the mean mass of the observed lenses to be larger than the mean mass of all the lenses. A likelihood analysis is performed to find the best parameters of the spatially varying MF that are compatible with the duration distribution of Large Magellanic Cloud microlensing candidates of the MACHO experiment.
No associations
LandOfFree
Microlensing by the Halo MACHOs with Spatially Varying Mass Function does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Microlensing by the Halo MACHOs with Spatially Varying Mass Function, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Microlensing by the Halo MACHOs with Spatially Varying Mass Function will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-567350