Dark Matter Determinations from Chandra Observations of Quadruply Lensed Quasars

Details Dark Matter Determinations from Chandra Observations of Quadruply Lensed Quasars Dark Matter Determinations from Chandra Observations of Quadruply Lensed Quasars

Jan 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21740305p&link_type=abstract

American Astronomical Society, AAS Meeting #217, #403.05; Bulletin of the American Astronomical Society, Vol. 43, 2011

Astronomy and Astrophysics

Astronomy

Scientific paper

I present Chandra observations of 14 quadruply lensed quasars. The X-ray data reveal flux ratio anomalies which are more extreme than those seen at optical wavelengths, confirming the microlensing origin of the anomalies originally seen in the optical data. The X-ray emitting regions are essentially point sources and therefore give a microlensing signal unencumbered by source size considerations. For each lensing galaxy, I present the most likely ratio of smooth material (dark matter) to clumpy material (stars) to explain the X-ray flux ratios. The ensemble of Chandra-observed quads indicates that the amount of matter projected along the lines of sight to the images is about 90% smooth dark matter and 10% stars.

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