[Mon Aug 20]
1208.3564
Elliptical weighted HOLICs for weak lensing shear measurement part 3: Random count noise effect for image's moments in weak lensing analysis
Okura, Futamase
Improvements of systematic errors in WL analysis using an elliptical weight function (E-HOLICS). Investigate systematic error which depends on signal to noise ratio of galaxy image. Poisson noise makes additional moment/centroid error; 1st order moments cancel, but not 2nd order moments. Derive equation that corrects for these effects. Test validity with simulation; systematic <1% in S/N>3 objects.
1208.3611
Planck intermediate results. X. Physics of the hot gas in the Coma cluster
Planck collaboration
Coma cluster SZ effect: out to r~3*R500. Find: Arnaud et al universal profile does not fit Coma; pressure profile for merging systems provide a good fit of the data at r<R500. By r=2*R500 it underestimates the observed y profile by x2. Possible indication of (i) contamination of SZ signal along the LoS, or (ii) pressure profile of Coma is higher at r>R500 than predicted by simulations. Some local features corresponding to shock waves; pressure discontinuity propagation mach number calculated (M~2). Find y and radio-synchrotron signals are quasi-linearly correlated on Mpc scales with small intrinsic scatter, implying energy density of CR e- is relatively constant throughout the cluster, or B-fields fall of much more slowly with radius than previously thought.
1208.3658
Cosmological calculations on the GPU
Bard, Bellis, Allen, Yepremyan, Kratochvil
Using CUDA, two algorithms on GPU vs CPU give 10-180x speed-up. Code publicly available.
[Tue Aug 21]
1208.3904
Galaxy-Mass conrrelations on 10 Mpc scales in the Deep Lens Survey
Choi, Tyson, ... Jee, .. Margonier, Wittman
GG lensing out to 15 Mpc. Investigate as a function of galaxy luminosity and redshift. 800k galaxies from DLS; use photoz and out to 1 deg. First observational evidence for growth in the galaxy-mass correlation on 10 Mpc scales with decreasing redshift and fixed range of luminosity. Find a scaling of projected halo mass with rest-frame luminosity similar to previous studies at lower redshift, for fixed redshifts. Systematic errors controlled, and enforce volume completeness through abs. mag cuts. Sample selection effects checked by simulations.
1208.4012
Wide-Field InfraRed Survey Telescope (WFIRST) Final Report
Green, ... Donahue, .. Hirata, ... Lauer, ... Padmanabhan, Perlmutter, Rhodes, Stern, Weinberg, ... Ivezic, ... McDonald, ... Riess, ... et al
WFIRST Science Definition Team (SDT) created in Dec 2010, to work with GSFC and JPL to produce a design reference mission (DRM). Interim design reference generated mid 2011, delivered and circulated. Reduce cost (DRM1), eliminate duplicate capabilities with JWST, Euclid, and LSST (DRM2).
1208.4026
The dark matter distribution in z~0.5 clusters of galaxies I: Determining scaling relations with weak lensing masses
Foëx, ...Arnaud, ... et al
Compare 11 clusters of optical and x-ray properties with WL masses. Scaling relation at 0.4<z<0.6, in agreement with previous works at lower redshifts. Covers two decades in mass.
