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Direct Mapping of Massive Compact Objects in Extragalactic Dark Halos

Published online by Cambridge University Press:  26 May 2016

Kaiki Taro Inoue  and
Masashi Chiba
Kaiki Taro Inoue
Affiliation:
National Astronomical Observatory, Mitaka, Tokyo 181-8588, Japan
Masashi Chiba
Affiliation:
Astronomical Institute, Tohoku University, Sendai 980-8578, Japan

Abstract

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We propose a method for directly detecting MASsive Compact Objects (MASCOs) in extragalactic halos, using VLBI techniques with extremely high resolution ˜ 0.01 milli-arcsec. If a galactic halo comprising a large number of MASCOs produces multiple images of a background radio-loud QSO by gravitational lensing, then a high-resolution radio map of each macro-lensed image should reveal microlensing effects by MASCOs. Based on the size, position, and magnified or demagnified patterns of images, we shall be able to determine the mass and density profile of an individual MASCO as well as its spatial distribution and abundance in a galactic halo.

Type
Part 4: Lensing
Information
Symposium - International Astronomical Union , Volume 220: Dark Matter in Galaxies , 2004 , pp. 139 - 140
Copyright
Copyright © Astronomical Society of the Pacific 2004