Search Publications
Cosmological Constraints from Galaxy Clusters in the 2500 Square-degree SPT-SZ Survey
Gladders, M. D.; Schrabback, T.; Rest, A. +74 more
We present cosmological parameter constraints obtained from galaxy clusters identified by their Sunyaev-Zel’dovich effect signature in the 2500 square-degree South Pole Telescope Sunyaev Zel’dovich (SPT-SZ) survey. We consider the 377 cluster candidates identified at z\gt 0.25 with a detection significance greater than five, corresponding to the 9…
The Optical-infrared Extinction Curve and Its Variation in the Milky Way
Peek, J. E. G.; Rix, H. -W.; Chambers, K. C. +19 more
The dust extinction curve is a critical component of many observational programs and an important diagnostic of the physics of the interstellar medium. Here we present new measurements of the dust extinction curve and its variation toward tens of thousands of stars, a hundred-fold larger sample than in existing detailed studies. We use data from t…
Quantifying Discordance in the 2015 Planck CMB Spectrum
Huang, Y.; Halpern, M.; Weiland, J. L. +4 more
We examine the internal consistency of the Planck 2015 cosmic microwave background (CMB) temperature anisotropy power spectrum. We show that tension exists between cosmological constant cold dark matter ({{Λ }}{CDM}) model parameters inferred from multipoles {\ell }\lt 1000 (roughly those accessible to Wilkinson Microwave Anisotropy Probe), and fr…
Beyond 31 mag arcsec-2: The Frontier of Low Surface Brightness Imaging with the Largest Optical Telescopes
Trujillo, Ignacio; Fliri, Jüergen
The detection of structures in the sky with optical surface brightnesses fainter than 30 mag arcsec-2 (3σ in 10 × 10 arcsec boxes; r-band) has remained elusive in current photometric deep surveys. Here we show how present-day telescopes of 10 m class can provide broadband imaging 1.5-2 mag deeper than most previous results within a reas…
The ALMA Spectroscopic Survey in the Hubble Ultra Deep Field: Continuum Number Counts, Resolved 1.2 mm Extragalactic Background, and Properties of the Faintest Dusty Star-forming Galaxies
Smail, I.; Magnelli, B.; Daddi, E. +31 more
We present an analysis of a deep (1σ = 13 µJy) cosmological 1.2 mm continuum map based on ASPECS, the ALMA Spectroscopic Survey in the Hubble Ultra Deep Field. In the 1 arcmin2 covered by ASPECS we detect nine sources at \gt 3.5σ significance at 1.2 mm. Our ALMA-selected sample has a median redshift of z=1.6+/- 0.4, with only one …
Search for Gamma-Ray Emission from the Coma Cluster with Six Years of Fermi-LAT Data
Troja, E.; Caraveo, P. A.; Orlando, E. +109 more
We present results from γ-ray observations of the Coma cluster incorporating six years of Fermi-LAT data and the newly released “Pass 8” event-level analysis. Our analysis of the region reveals low-significance residual structures within the virial radius of the cluster that are too faint for a detailed investigation with the current data. Using a…
BICEP2/Keck Array VIII: Measurement of Gravitational Lensing from Large-scale B-mode Polarization
Ade, P. A. R.; Bock, J. J.; Crill, B. P. +62 more
We present measurements of polarization lensing using the 150 GHz maps, which include all data taken by the BICEP2 and Keck Array Cosmic Microwave Background polarization experiments up to and including the 2014 observing season (BK14). Despite their modest angular resolution (∼ 0.5°), the excellent sensitivity (∼3µK-arcmin) of these maps ma…
BAHAMAS: New Analysis of Type Ia Supernovae Reveals Inconsistencies with Standard Cosmology
van Dyk, David A.; Shariff, Hikmatali; Jiao, Xiyun +1 more
We present results obtained by applying our BAyesian HierArchical Modeling for the Analysis of Supernova cosmology (BAHAMAS) software package to the 740 spectroscopically confirmed supernovae of type Ia (SNe Ia) from the “Joint Light-curve Analysis” (JLA) data set. We simultaneously determine cosmological parameters and standardization parameters,…
HeCS-SZ: The Hectospec Survey of Sunyaev-Zeldovich-selected Clusters
Diaferio, Antonaldo; Hwang, Ho Seong; Geller, Margaret J. +1 more
We estimate cluster masses and velocity dispersions for 123 clusters from optical spectroscopy to compare the Sunyaev-Zeldovich (SZ) mass proxy and dynamical masses. Our new survey, HeCS-SZ (Hectospec Cluster Survey of SZ-selected clusters), includes 7721 new or remeasured redshifts from MMT/Hectospec observations of 21 SZ-selected clusters at red…
Cold Milky Way HI Gas in Filaments
Kerp, J.; Winkel, B.; Lenz, D. +4 more
We investigate data from the Galactic Effelsberg-Bonn H I Survey, supplemented with data from the third release of the Galactic All Sky Survey (GASS III) observed at Parkes. We explore the all-sky distribution of the local Galactic H I gas with | {v}{{LSR}}| \lt 25 km s-1 on angular scales of 11‧-16‧. Unsharp masking is appli…