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BEGIN:VEVENT
DTSTART;TZID=Atlantic/Canary:20170502T123000
DTEND;TZID=Atlantic/Canary:20170502T133000
UID:iactalks-1025
X-WR-CALNAME: IAC Talks: Open Astronomy Seminars
X-ORIGINAL-URL: /iactalks/Talks/view/1025
CREATED:2017-05-02T12:30:00+01:00
X-WR-CALDESC: IAC Talks upcomming talks
SUMMARY:Limits on the Mass and Abundance of Primordial Massive Black Holes
DESCRIPTION:Limits on the Mass and Abundance of Primordial Massive Black Ho
 les\nProf. Evencio Mediavilla Gradolph\n\nThe lack of detection of element
 ary particles that could explain dark matter and the recent detection of g
 ravitational waves by the LIGO experiment have renewed interest in the hyp
 othesis that dark matter can be made of Primordial Massive Black Holes (PM
 BH). We review very briefly the outcomes and limits of the classical MACHO
  experiment, used to probe the dark matter in the halo of the Milky Way fr
 om galactic microlensing, and introduce the more universal scenario of qua
 sar microlensing. Quasar microlensing is sensitive to any population of co
 mpact objects in the lens galaxy, to their abundance and to their mass. Us
 ing microlensing data from 24 lensed quasars, we conclude that the fractio
 n of mass in any type of MACHO is negligible outside of the 0.05 MSun<M
 <0.45 MSun mass range. This excludes any significant population of inte
 rmediate mass PBH. We estimate a fraction of halo mass in microlenses of 2
 0%. The range of masses and abundances are in agreement with those expecte
 d for the stellar component. Using the mean mass estimate and some limits 
 derived from multiwavelength microlensing observations we speculate about 
 the stellar Present Day Mass Function.
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