Can EROS and MACHO be detecting the galactic spheroid instead of the galactic halo?

@article{Giudice1994CanEA,
  title={Can EROS and MACHO be detecting the galactic spheroid instead of the galactic halo?},
  author={Giudice and Mollerach and Roulet},
  journal={Physical review. D, Particles and fields},
  year={1994},
  volume={50 4},
  pages={
          2406-2413
        }
}
Models of our galaxy based on dynamical observations predict a spheroid component much heavier than accounted for by direct measurements of star counts and high velocity stars. If, as first suggested by Caldwell and Ostriker, this discrepancy is due to a large population of faint low-mass stars or dark objects in the spheroid, the spheroid could be responsible for microlensing events for sources in the Large Magellanic Cloud (LMC). We show that, although the rate of events is lower than… 

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References

SHOWING 1-10 OF 16 REFERENCES
Astrophys. J
  • Astrophys. J
  • 1983
Astrophys. J
  • Astrophys. J
  • 1990
Astron. Astrophys
  • Astron. Astrophys
  • 1988
Astrophys. J
  • Astrophys. J
  • 1981
Astrophys. J
  • Astrophys. J
  • 1978
Astrophys. J
  • Astrophys. J
  • 1993
Fermilab preprint FERMILAB-Pub-93
  • Fermilab preprint FERMILAB-Pub-93
  • 1993
Astrophys. J
  • Astrophys. J
  • 1992
Astrophys. J
  • Astrophys. J
  • 1991
...
1
2
...