Astronomy and Astrophysics – Astronomy
Scientific paper
May 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aas...198.3702k&link_type=abstract
American Astronomical Society, 198th AAS Meeting, #37.02; Bulletin of the American Astronomical Society, Vol. 33, p.836
Astronomy and Astrophysics
Astronomy
Scientific paper
Galactic microlensing results from the MACHO, EROS and OGLE collaborations suggest that a significant fraction ( ~20%) of the dark-matter halo inside 50 kpc might be composed of massive compact objects with typical masses of ~0.6 Msun. Direct searches for high proper-motion objects in the solar neighborhood and HDF suggest that these objects could be white dwarfs, although a high mass fraction posses substantial problems for standard star-formation models. We present new VLA multi-frequency radio observations of the edge-on spiral gravitational lens B1600+434 at a redshift z=0.41. They show strong non-intrinsic variations in the lensed image that passes predominantly through the dark-matter halo around the lens galaxy. We argue that these variations are the result of microlensing. The halo line-of-sight in Galactic microlensing observations and that in B1600+434 are similar, allowing for a unique comparison of these fully independent results from two spiral galaxies. We present results of this comparison and discuss whether the microlensing populations in B1600+434 and our Galaxy, and the population of high proper-motion objects can be the same.
Blandford Roger. D.
de Bruyn Ger A.
Fassnacht Chris D.
Koopmans Leon V. E.
Wambsganss Joachim
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