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arXiv:astro-ph/0011375 (astro-ph)
[Submitted on 21 Nov 2000]

Title:Not enough stellar mass Machos in the Galactic halo

Authors:A. Milsztajn, T. Lasserre (DAPNIA-SPP, CEA-Saclay) (for the EROS collaboration)
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Abstract: We present an update of results from the search for microlensing towards the Large Magellanic Cloud (LMC) by EROS (Experience de Recherche d'Objets Sombres). We have now monitored 25 million stars over three years. Because of the small number of observed microlensing candidates (four), our results are best presented as upper limits on the amount of dark compact objects in the halo of our Galaxy. We discuss critically the candidates and the possible location of the lenses, halo or LMC . We compare our results to those of the MACHO group. Finally, we combine these new results with those from our search towards the Small Magellanic Cloud as well as earlier ones from the EROS1 phase of our survey. The combined data is sensitive to compact objects in the broad mass range $ 10^{-7} - 10 $ solar masses. The derived upper limit on the abundance of stellar mass MACHOs rules out such objects as the dominant component of the Galactic halo if their mass is smaller than 2 solar masses.
Comments: 7 pages, 4 figures, presented at the XIX International Conference on Neutrino Physics and Astrophysics, Sudbury, Canada, June 2000
Subjects: Astrophysics (astro-ph)
Report number: DAPNIA/SPP-00-26
Cite as: arXiv:astro-ph/0011375
  (or arXiv:astro-ph/0011375v1 for this version)
  https://doi.org/10.48550/arXiv.astro-ph/0011375
Journal reference: Nucl.Phys.Proc.Suppl.91:413-419,2001
Related DOI: https://doi.org/10.1016/S0920-5632%2800%2900970-1

Submission history

From: Alain Milsztajn [view email]
[v1] Tue, 21 Nov 2000 00:35:54 UTC (213 KB)
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