Rebecca A. Bernstein

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We present the first detection of the mean flux of the optical extragalactic background light (EBL) at 3000, 5500, and 8000Å. Diffuse foreground flux at these wavelengths comes from terrestrial airglow, dust– scattered sunlight (zodiacal light), and dust–scattered Galactic starlight (diffuse Galactic light). We have avoided the brightest of these,(More)
The food collected by all species of ants in eleyen communities was sampled, and the niche breadths and overlaps calculated. In communities of the Mojave Desert, the mean niche breadths were found to be relatively constant, regardless of changes in elevation or species diversity. Niche overlaps, however, were positively correlated with species diversity.(More)
We present new radial velocity results for 178 stars in the Fornax dwarf spheroidal galaxy, of which at least 158 are probable Fornax members. We combine with previously published data to obtain a radial velocity sample with 209 stars, of which at least 179 are probable Fornax members. We detect the hint of rotation about an axis near Fornax’s morphological(More)
We report the results of a deep search for an optical counterpart to the gravitational wave (GW) event GW150914, the first trigger from the Advanced LIGO GW detectors. We used the Dark Energy Camera (DECam) to image a 102 deg area, corresponding to 38% of the initial trigger high-probability sky region and to 11% of the revised high-probability region. We(More)
1. Two granivorous ant species,Novomessor cockerelli andVeromessor pergandei, were observed at two sites of differing food abundances in the Sonoran Desert to determine whether they were competing for food resources. 2. Niche breadths for each species and niche overlaps between species were calculated for each site for the parameters of temperature(More)
We measure the correlation of galaxy lensing and cosmic microwave background lensing with a set of galaxies expected to trace the matter density field. The measurements are performed using pre-survey Dark Energy Survey (DES) Science Verification optical imaging data and millimetre-wave data from the 2500 sq. deg. South Pole Telescope Sunyaev–Zel’dovich(More)
We measure the cross-correlation between the galaxy density in the Dark Energy Survey (DES) Science Verification data and the lensing of the cosmic microwave background (CMB) as reconstructed with the Planck satellite and the South Pole Telescope (SPT). When using the DES main galaxy sample over the full redshift range 0.2< zphot < 1.2, a cross-correlation(More)
We have used the Hubble Space Telescope Wide–Field and Planetary Camera 2, in combination with ground–based spectroscopy, to measure the integrated flux of galaxies at optical wavelengths — the extragalactic background light (EBL). We have also computed the integrated light from individual galaxy counts in the images used to measure the EBL and in the(More)