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SUMMARY:Studying the population of black holes in the Milky Way with micro
 lensing - Lukasz Wyrzykowski
DTSTART:20180606T124500Z
DTEND:20180606T131500Z
UID:TALK104536@talks.cam.ac.uk
CONTACT:Dr Nick Bate
DESCRIPTION:As shown by gravitational wave detections\, galaxies harbour a
 n unknown population of black holes at high masses of either stellar or pr
 imordial origin. In our Galaxy\, such dark objects can be found and studie
 d solely via gravitational microlensing method. So far\, microlensing prov
 ided one of the tightest constraints on dark matter primordial black holes
  in the halo in the mass range between 0.01 and few Solar masses. Also\, m
 icrolensing indicates that the dark lenses mass distribution does not show
  the mass-gap seen between neutron stars and X-ray binary black holes.\nI 
 will describe our search for black hole lenses in both archival OGLE data 
 and among on-going microlensing events found by Gaia. The combination of t
 ime-domain astrometry from Gaia and photometry from the ground and Spitzer
  space mission will allow to uniquely derive masses and distances of lense
 s\, and hence to recognise the nature of dark lenses. 
LOCATION:Sackler Lecture Theatre\, IoA
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