New limits from microlensing on Galactic Black Holes in the mass range
  10xMsun < M < 1000xMsun
  We have searched for long duration microlensing events originating from
intermediate mass Black Holes (BH) in the halo of the Milky Way, using archival
data from EROS-2 and MACHO photometric surveys towards the Large Magellanic
Cloud. We combined data from these two surveys to create a common database of
light curves for 14.1 million objects in LMC, covering a total duration of 10.6
years, with flux series measured through 4 wide band filters. We have carried
out a microlensing search on these light curves, complemented by 22.7 million
light curves, observed by EROS-2 only or MACHO only over about 7 years, with
flux series measured through only 2 filters. A likelihood analysis, taking into
account LMC self lensing and Milky Way disk contributions allows us to conclude
that compact objects with masses in the range 10 - 100 Msun cannot make up more
than ~15% of a standard halo total mass (at 95% confidence level). Our analysis
sensitivity weakens for heavier objects, although we still exclude that ~ 50%
of the halo be made of ~ 1000xMsun BHs. Combined with previous EROS results, an
upper limit of ~ 15% of the total halo mass can be obtained for the
contribution of compact halo objects in the mass range 10^{-6} - 10^2 Msun.
