Day 989

Thursday.


1510.03870
The bulge-disk decomposition of AGN host galaxies
Bruce et al

... Find no strong corruption between the point-source component and AGN activity, and that these point-source components are best modeled physically by nuclear starbursts.  The analysis of the bulge and disk fractions of these AGN hosts in comparison to a mass-matched control sample reveals a similar morphological evolutionary track for both the active and non-active populations, providing evidence in favor of a model where AGN activity is triggered by secular processes.


1510.03962
Cosmic shear results from the deep lens survey - II: full cosmological parameter constraints from tomography
Jee, Tyson, Hilbert, Schneider, Schmidt, Witman

Present a tomographic cosmic shear study from DLS, which, providing a limiting magnitude r_lm~27 (5 sigma), is designed as a pre-cursor LSST survey with an emphasis on depth.  Using 5 tomographic redshift bins, study their auto-and cross-correlations to constrain cosmo parameters.  Use a luminosity-dependent nonlinear model to account for the astrophysical systematics originating form IA of galaxy shapes.  Find that the cosmo leverage of the DLS is among the highest among existing >10 sq.deg comic shear surveys.  Combining the DLS tomography with the 9yr results of the WMAP9 gives Omega_m=0.293±0.014, sigma_8=0.833±0.018, H0=68.6±1.3 km/s/Mpc, and Ombea_b=0.0475±0.0012 for LCDM, reducing the uncertainties of the WMAP9-only constraints by ~50%.  When flatness is not assumed for LCDM, obtain the curvature constraint Omega_k=-0.010±0.014 from the DLS+WMAP9 combination, which however is not well constrained when WMAP9 is used alone.  The DE EoS parameter w is highly constrained when BAO data are added, yielding w=-1.02±0.10 with the DLS+@MAP9+BAO joint probe.  The addition of SN constraints further tightens the parameter to w=-1.03±0.03.  The joint constraints are fully consistent with the final Planck results and also the predictions of a LCDM universe.