Dark Matter Search with Gravitational Microlensing Events
نویسندگان
چکیده
منابع مشابه
Gravitational Microlensing and Dark Matter in the Galactic Halo
Recent observations of microlensing events in the Large Magellanic Cloud suggest that a sizable fraction of the galactic halo is in the form of MACHOs (Massive Astrophysical Compact Halo Objects) with mass ∼ 0.1M⊙. We present the basics of microlensing and give an overview of the results obtained so far. We also describe a scenario in which dark clusters of MACHOs and cold molecular clouds (mai...
متن کاملGravitational Microlensing and Dark Matter Problem: Results and Perspectives
Foundations of standard theory of microlensing are described, namely we consider microlensing stars in Galactic bulge, the Magellanic Clouds or other nearby galaxies. We suppose that gravitational microlenses lie between an Earth observer and these stars. Criteria of an identification of microlensing events are discussed. We also consider such microlensing events which do not satisfy these crit...
متن کاملHigh Longevity Microlensing Events and Dark Matter Black Holes
Gravitational microlensing has been employed to identify massive halo objects by their amplilification of distant sources; MACHO searches have studied event times 2h∼ t0 < ∼ 2y corresponding masses in the range 10M⊙ < ∼ M < ∼ 100M⊙. We suggest that larger masses up to 10M⊙ are also of considerable interest. It has not been excluded that there is a significant number of halo black holes with suc...
متن کاملDark Matter Results from Microlensing
Gravitational microlensing is established as a powerful method of discovering and characterizing populations of dark objects. Our collaboration, the MACHO collaboration, has discovered the bulk of the over 300 microlensing events that have been found. Most of these have been found towards the Galactic bulge, but for the dark matter question, which is the subject of this talk, only the dozen or ...
متن کاملMicrolensing searches of dark matter
The evolution of the observational results of microlensing towards the LMC and some of the suggested interpretations to account for them are discussed. It is emphasized that the results at present are indicative of a lensing population of white dwarfs, possibly in the spheroid (not dark halo) of the Galaxy, together with the more standard backgrounds of stellar populations in the Magellanic Clo...
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ژورنال
عنوان ژورنال: Progress of Theoretical Physics Supplement
سال: 1999
ISSN: 0375-9687
DOI: 10.1143/ptps.133.211