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Astrometric study of MACHO halo distribution in our Galaxy

Published online by Cambridge University Press:  26 May 2016

Kouji Ohnishi ,
Mizuhiko Hosokawa  and
Toshio Fukushima
Kouji Ohnishi
Affiliation:
Nagano National College of Technology, Nagano, 381-8550, Japan
Mizuhiko Hosokawa
Affiliation:
Communications Research Laboratory, Tokyo, 184-8795, Japan
Toshio Fukushima
Affiliation:
National Astronomical Observatory, Mitaka, Tokyo, 181-8588, Japan

Abstract

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We estimated the optical depth and event rate of μas level astrometric microlensing for the stars outside our galaxy caused by MACHOs. For the stars in the LMC and the SMC, the optical depth of a 1 μas detection threshold is on the order of 10–1 and the event rate of the induced proper motion of 1 μas/year is on the order of 10–3/yr with the event duration of around a hundred years. They depend on the distribution of lenses and sources. This poses a constraint on the expected probability of photometric self-lensing in LMC and SMC.

Type
Part 4: Lensing
Information
Symposium - International Astronomical Union , Volume 220: Dark Matter in Galaxies , 2004 , pp. 135 - 136
Copyright
Copyright © Astronomical Society of the Pacific 2004 

References

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