Day 699

Tuesday.

1407.3275
Fermi-LAT gamma-ray anisotropy and intensity explained by unresolved Radio-Loud Active Galactic Nuclei
Di Mauro, et al

Measured properties of the isotropic gamma-ray background (IGRB) can be used to constrain the characteristics of proposed contributing sources.  Find that collectively radio-loud AGN can account for the entirety of the IGRB intensity but a negligible contribution to the anisotropy, while high-synchrotron-peaked BL Lacertae objects provide the dominant contribution to the anisotropy.  In anticipation of upcoming measurements with the Fermi-LAT and the forthcoming Cherenkov Telescope Array, predict the anisotropy in the broader energy range that will be accessible to future observations.

1407.3276
The mass dependance of satellite quenching in Milky Way-like haloes
Phillips, ... Boylan-Kolchin, Bullock, et al

Examine the quenching of satellite galaxies around isolated MW-like hosts in the local Universe, from SDSS.  Find that the efficiency of satellite quenching around isolated galaxies is low and roughly constant over 2 orders of magnitude in satellite stellar mass (M*=1e8.5 to 10.5 Msun), with only ~20% of systems quenched as a result of environmental processes.  While largely independent of satellite stellar mass, satellite quenching does exhibit clear dependence on the properties of the host.  Show that satellite of passive hosts are substantially more likely to be quenched than those of SF hosts, and present evidence that more massive haloes quench their satellites more efficiently.  These results extend trends seen previously in more massive host haloes and for higher satellite masses.  Taken together, it appears that galaxies with stellar masses larger than about 1e8 Msun are uniformly resistant to environmental quenching, with the relative harshness of the host environment likely serving as the primary driver of satellite quenching.  At lower stellar masses (<1e8 Msun), however, observations of the LG suggest that the vast majority of the satellite galaxies are quenched, potentially pointing towards a characteristic satellite mass scale below which quenching efficiency increases dramatically.

1407.3330
Statistical challenges in weak lensing cosmology
Takada

Address one of the most fundamental, statistical questions inherent in WL cosmology: whether or not we can recover the initial Gaussian information content of LSS by combining the WL observables, here focused on the WL PS and bispectrum.  To address this question, fully take into account correlations between the PS of different multipoles and the bispectra of different triangle configurations, measured from a finite area survey.  In particular, show that super-survey modes whose length scale is larger than of comparable with the survey size cause significant sample variance n the WL correlations via the mode-coupling with sub-survey modes due to NL gravitational clustering -- the so-called super-sample variance.  In this paper, discuss the origin of the super-sample variance and then study the information content inherent in the WL correlation functions up to 3-pt level.

1407.3344
Influence of stellar multiplicity on planet formation. II. Planets are less common in multiple-star systems with separations smaller than 1500 AU
Wang et al

Almost half of stellar systems in the solar neighborhood are made of multiple stars; in multiple-star systems, planet formation is under the dynamical influence of stellar companions, and the planet occurrence rate is expected to be different from that for single stars.  Infer the planet occurrence rate in multiple-star systems by measuring the stellar multiplicity rate for planet host stars.  for a 56 subsample of Kepler planet host stars, look for stellar companions.  Detect 59 visual stellar companions to 25 planet host stars with AO data.  After detection bias correction, find that planet formation is supposed in multiple-star systems with separations smaller than 1500 AU.