000184502 001__ 184502
000184502 005__ 20180317094448.0
000184502 0247_ $$2doi$$a10.1111/j.1365-2966.2012.21099.x
000184502 022__ $$a0035-8711
000184502 02470 $$2ISI$$a000307018300004
000184502 037__ $$aARTICLE
000184502 245__ $$aThe cosmological impact of intrinsic alignment model choice for cosmic shear
000184502 260__ $$aHoboken$$bWiley-Blackwell$$c2012
000184502 269__ $$a2012
000184502 300__ $$a11
000184502 336__ $$aJournal Articles
000184502 520__ $$aWe consider the effect of galaxy intrinsic alignments (IAs) on dark energy constraints from weak gravitational lensing. We summarize the latest version of the linear alignment model of IAs, following a brief note of Hirata & Seljak and further interpretation by Laszlo et al. We show the cosmological bias on the dark energy equation of state parameters w0 and wa$ that would occur if IAs were ignored. We find that w0 and wa are both catastrophically biased, by an absolute value of just greater than unity under the Fisher matrix approximation. This contrasts with a bias several times larger for the earlier IA implementation. Therefore, there is no doubt that IAs must be taken into account for future stage III experiments and beyond. We use a flexible grid of IA and galaxy bias parameters as used in previous work and investigate what would happen if the Universe is described by used the latest IA model, but we assumed the earlier version. We find that despite the large difference between the two IA models, the grid flexibility is sufficient to remove cosmological bias and recover the correct dark energy equation of state. In an appendix, we compare observed shear power spectra to those from a popular previous implementation and explain the differences.
000184502 6531_ $$agalaxies: evolution
000184502 6531_ $$acosmology: observations
000184502 6531_ $$alarge-scale structure of Universe
000184502 700__ $$aKirk, Donnacha$$uUCL, Dept Phys & Astron, London WC1E 6BT, England
000184502 700__ $$0245766$$aRassat, Anais$$g214582$$uObserv Sauverny, Swiss Fed Inst Technol Lausanne EPFL, LASTRO, CH-1290 Versoix, Switzerland
000184502 700__ $$aHost, Ole$$uUCL, Dept Phys & Astron, London WC1E 6BT, England
000184502 700__ $$aBridle, Sarah$$uUCL, Dept Phys & Astron, London WC1E 6BT, England
000184502 773__ $$j424$$k3$$q1647-1657$$tMonthly Notices Of The Royal Astronomical Society
000184502 909CO $$ooai:infoscience.tind.io:184502$$particle$$pSB
000184502 909C0 $$0252365$$pLASTRO$$xU10933
000184502 917Z8 $$x103317
000184502 937__ $$aEPFL-ARTICLE-184502
000184502 973__ $$aEPFL$$rREVIEWED$$sPUBLISHED
000184502 980__ $$aARTICLE