Day 702

Friday.

1407.4516
Weighting the Giants IV: cosmology and neutrino mass
Mantz, von der Linden, Allen, Applegate, ... et al

Employ robust WL measurements to improve constraints from measurements of the galaxy cluster mass function and its evolution, using X-ray selected clusters detected in the ROSAT All-Sky Survey.  Lensing analysis provides a constraint on the absolute mass scale of such clusters at the 8% level (including both statistical and systematic uncertainties), a factor of ~2 improvement over the best previous work.  In combination with the survey data and extensive X-ray follow-up observations, the WL measurements lead to a tight constraint on a combination of the mean matter density and late-time normalization of the matter PS, sigma_8(Omega_m/0.3)^0.17=0.81pm0.03, with marginalized, 1d constraints of Omega_m=0.26pm0.03 and sigma_8=0.83pm0.04.  These constraints are consisted with own previous work, but are offset from some independent cluster studies.  New results are in good agreement with constraints from CMB data under the assumption of flat LCDM cosmology with minimal neutrino mass.  Consequently, find no evidence for non-minimal neutrino mass from the combination of cluster data with CMB, SN and BAO measurements, regardless of whether WMAP or Planck data are used (and independent of the recent claimed detection of B-modes on degree scales).  Also present improved constraints on models of DE (both constant and evolving) and modifications of gravity, for which the cluster measurements provide some of the tightest and most robust constraints to date, as well as primordial non-Gaussianity.  In all cases, find results consistent with the standard model of cosmology.  Assuming flatness, the constraints for a constant DE EoS from the cluster data alone are at the 15% level.

1407.4563
Electron-capture supernovae exploding within their progenitor wind
Moriya, Tominaga, Langer, Nomoto, Blinnikov, Sorokina

The most massive stars on the AGB, so called super-AGB stars, are thought to produce SNe triggered by electron captures in their degenerate O+Ne+Mg cores.  Super-AGB stars are expected to have slow winds with high mass-loss rates, so their wind density is high.  The explosions of super-AGB stars are therefore presumed to occur in this dense wind.  Provide the first synthetic light curves (LCs) for such events by exploding realistic electron-capture supernova (ecSN) progenitors within their super-AGB winds.  Find that the early LC, i.e., before the recombination wave reaches the bottom of the H-rich envelope of SN eject (the plateau phase), is not affected by the dense wind.  However, after the plateau phase, the luminosity remains higher with the super-AGB wind is taken into account.  Compare results to the historical LC of AN 1054, the progenitor of the Crab Nebula, and show that the explosion of an ecSN within an ordinary super-AGB wind can explain the LC features.  Conclude that SN 1054 could have been a Type IIn SN without any extra extreme mass loss which was previously suggested to be necessary to account for its early high luminosity.  Also show that the LCs match Type IIn SNe with an early plateau phase ('Type IIn-P') and suggest that they are ecSNe within super-AGB winds.  Although some ecSNe can be bright in the optical spectral range due to the large progenitor radius, their X-ray luminosity from the interaction does not necessarily get as bright as other Type IIn SNe whose optical luminosities are also powered by the interaction.  Thus, suggest that optically-bright X-ray-faint Type IIn SNe can emerge from ecSNe.  Optically-faint Type IIn SNe, such as SN 2008S, can also originate from ecSNe if their H-rich envelope masses are small.  Some of them can be observed as 'Type IIn-b' SNe due to the small H-rich envelope mass.

1407.4693
A cluster finding algorithm based on the multi-band identification of red-sequence galaxies
Oguri

Present a new algorithm, CAMIRA, to identify clusters of galaxies in wide-field imaging survey data.  Based the algorithm on the stellar population synthesis model to predict colors of red-sequence galaxies at a given redshift for an arbitrary set of bandpass filters, with additional calibration using a sample of spectroscopic galaxies to improve the accuracy of the model prediction.  Run the algorithm on ~11960 deg^2 of imaging data from SDSS DR8 to construct a catalog of 71743 clusters in 0.1<z<0.6 with richness after correcting for he incompleteness of the richness estimate greater than 20.  Cross-match the cluster catalogue with external cluster catalogues to find that the photometric cluster redshift estimates are accurate with low bias and scatter, and that the corrected richness correlates well with X-ray luminosities and temperatures.  Use the CFHTLenS shear catalog to calibrate the mass-richness relation from stacked WL analysis.  Stacked WL signals are detected significantly for 8 subsamples of the SDSS clusters divided by redshift and richness binds, which are then compared with model predictions including miscentering effects to constraint mean halo masses of individual bins.  Find the richness correlates well with the halo mass, such that the corrected richness limit of 20 corresponds to the cluster virial mass limit of about 1e14 Msun/h for the SDSS DR8 cluster sample.