Corrections for gravitational lensing of supernovae: better than average?
2006 (English)In: Astrophysical Journal, ISSN 0004-637X, E-ISSN 1538-4357, Vol. 640, 417-427 p.Article in journal (Refereed) Published
We investigate the possibility of correcting for magnification due to gravitational lensing of standard candlesources, such as Type Ia supernovae. Our method uses the observed properties of the foreground galaxies along thelines of sight to each source, and the accuracy of the lensing correction depends on the quality and depth of theseobservations as well as the uncertainties in translating the observed luminosities to the matter distribution in thelensing galaxies. The current work is limited to cases in which the matter density is dominated by the individualgalaxy halos. However, it is straightforward to generalize the method to also include gravitational lensing fromcluster scale halos.We show that the dispersion due to lensing for a standard candle source at z ¼1:5 can be reducedfrom about 7% toP3%; i.e., the magnification correction is useful in reducing the scatter in the Type Ia Hubble diagram,especially at high redshifts where the required long exposure times make it hard to reach large statistics andthe dispersion due to lensing becomes comparable to the intrinsic Type Ia scatter.
Place, publisher, year, edition, pages
The American Astronomical Society , 2006. Vol. 640, 417-427 p.
gravitational lensing — supernovae: general
Astronomy, Astrophysics and Cosmology
IdentifiersURN: urn:nbn:se:su:diva-24017DOI: 10.1086/499346OAI: oai:DiVA.org:su-24017DiVA: diva2:196412
Part of urn:nbn:se:su:diva-6382005-09-032005-09-032010-09-15Bibliographically approved