Magnification as a Probe of Dark Matter Halos at high redshift - Astrophysics > Cosmology and Nongalactic AstrophysicsReport as inadecuate




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Abstract: We propose a new approach for measuring the mass profile and shape of groupsand clusters of galaxies, which uses lensing magnification of distantbackground galaxies. The main advantage of lensing magnification is that,unlike lensing shear, it relies on accurate photometric redshifts only and notgalaxy shapes, thus enabling the study of the dark matter distribution withunresolved source galaxies. We present a feasibility study, using a realpopulation of z > 2.5 Lyman Break Galaxies as source galaxies, and where,similar to galaxy-galaxy lensing, foreground lenses are stacked in order toincrease the signal-to-noise. We find that there is an interesting newobservational window for gravitational lensing as a probe of dark matter halosat high redshift, which does not require measurement of galaxy shapes.



Author: Ludovic Van Waerbeke, Hendrik Hildebrandt, Jes Ford, Martha Milkeraitis

Source: https://arxiv.org/







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