Microlensing in Galactic Halos
S. Calchi Novati (University of Salerno, INFN, sez. Napoli, Italy)
TL;DR
This paper reviews microlensing observations towards the Magellanic Clouds and M31 to investigate the presence of MACHOs as dark matter in galactic halos, highlighting the need for more data and detailed modeling.
Contribution
It provides an overview of current microlensing results and emphasizes the importance of increased observations and refined models to determine halo composition.
Findings
Few microlensing events detected so far
No definitive conclusion on MACHO contribution
Need for larger data sets and better models
Abstract
In the framework of the search of dark matter in galactic halos in form of massive compact halo object (MACHOs), we discuss the status of microlensing observations towards the Magellanic Clouds and the Andromeda galaxy, M31. The detection of a few microlensing events has been reported, but an unambiguous conclusion on the halo content in form on MACHOs has not been reached yet. A more detailed modelling of the expected signal and a larger statistics of observed events are mandatory in order to shed light on this important astrophysical issue.
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Taxonomy
TopicsGalaxies: Formation, Evolution, Phenomena · Scientific Research and Discoveries · Stellar, planetary, and galactic studies