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29 papers · 1 filter
The First HeI*λ10830 BALQSO
Karen M. Leighly, Matthias Dietrich, Sara Barber
We report the discovery of the first HeI*λ10830 broad absorption line quasar FBQS J1151+3822. Using new infrared and optical spectra, as well as the SDSS spectrum, we extracted the…
Simultaneous Falsification of LCDM and Quintessence with Massive, Distant Clusters
Michael J. Mortonson, Wayne Hu, Dragan Huterer
Observation of even a single massive cluster, especially at high redshift, can falsify the standard cosmological framework consisting of a cosmological constant and cold dark matte…
Primordial Nucleosynthesis: The Predicted and Observed Abundances and Their Consequences
Gary Steigman
For a brief time in its early evolution the Universe was a cosmic nuclear reactor. The expansion and cooling of the Universe limited this epoch to the first few minutes, allowing t…
The first search for extremely-high energy cosmogenic neutrinos with the IceCube Neutrino Observatory
IceCube Collaboration, R. Abbasi, Y. Abdou +250
We report on the results of the search for extremely-high energy (EHE) neutrinos with energies above GeV obtained with the partially (30%) constructed IceCube in 2007.…
Quasar Selection Based on Photometric Variability
C. L. MacLeod, K. Brooks, Z. Ivezic +7
We develop a method for separating quasars from other variable point sources using SDSS Stripe 82 light curve data for ~10,000 variable objects. To statistically describe quasar va…
A Study of Gravitational Lens Chromaticity using Ground-based Narrow Band Photometry
Ana M. Mosquera, José A. Muñoz, Evencio Mediavilla +1
We present observations of wavelength-dependent flux ratios for four gravitational lens systems (SDSS~J1650+4251, HE~04351223, FBQ 0951+2635, and Q~0142100) obtained with the…