View Full Document

COSMOLOGY FROM SUPERNOVA MAGNIFICATION MAPS



View the full content.
View Full Document
View Full Document

15 views

Unformatted text preview:

The Astrophysical Journal 637 L77 L80 2006 February 1 2006 The American Astronomical Society All rights reserved Printed in U S A COSMOLOGY FROM SUPERNOVA MAGNIFICATION MAPS Asantha Cooray 1 Daniel E Holz 2 3 and Dragan Huterer3 Received 2005 September 17 accepted 2005 December 20 published 2006 January 18 ABSTRACT High z Type Ia supernovae are expected to be gravitationally lensed by the foreground distribution of largescale structure The resulting magnification of supernovae is statistically measurable and the angular correlation of the magnification pattern directly probes the integrated mass density along the line of sight Measurements of the cosmic magnification of supernovae therefore complement measurements of galaxy shear in providing a direct measure of the clustering of the dark matter As the surface density of supernovae is typically much smaller than that of sheared galaxies the two point correlation function of lensed Type Ia supernovae suffers from significantly increased shot noise Nevertheless we find that the magnification map of a large sample of supernovae provides an important cosmological tool For example a search over 20 deg2 over 5 years leading to a sample of 10 000 supernovae would measure the angular power spectrum of cosmic magnification with a cumulative signal tonoise ratio of 20 This detection can be further improved once the supernova distance measurements are crosscorrelated with measurements of the foreground galaxy distribution The magnification maps made using supernovae can be used for important cross checks with traditional lensing shear statistics obtained in the same fields and can help to control systematics Subject headings cosmology observations cosmology theory galaxies fundamental parameters gravitational lensing Online material color figures While lensing has mostly been considered as a nuisance planned large area SN surveys provide an opportunity to treat the lensing magnification of SNe as a signal In practice by



Access the best Study Guides, Lecture Notes and Practice Exams

Loading Unlocking...
Login

Join to view COSMOLOGY FROM SUPERNOVA MAGNIFICATION MAPS and access 3M+ class-specific study document.

or
We will never post anything without your permission.
Don't have an account?
Sign Up

Join to view COSMOLOGY FROM SUPERNOVA MAGNIFICATION MAPS and access 3M+ class-specific study document.

or

By creating an account you agree to our Privacy Policy and Terms Of Use

Already a member?