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- Goddard Space Flight CenterUS657 papers
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10 papers · 2 filters
ATCA observations of the MACS-Planck Radio Halo Cluster Project II. Radio observations of an intermediate redshift cluster sample
G. Martinez Aviles, M. Johnston-Hollitt, C. Ferrari +16
A fraction of galaxy clusters host diffuse radio sources whose origins are investigated through multi-wavelength studies of cluster samples. We investigate the presence of diffuse…
Observations of the galaxy cluster CIZA J2242.8+5301 with the Sardinia Radio Telescope
F. Loi, M. Murgia, F. Govoni +25
We observed the galaxy cluster CIZA J2242.8+5301 with the Sardinia Radio Telescope to provide new constraints on its spectral properties at high frequency. We conducted observation…
VLA Radio Observations of the HST Frontier Fields Cluster Abell 2744: The Discovery of New Radio Relics
C. J. J. Pearce, R. J. van Weeren, F. Andrade-Santos +12
Cluster mergers leave distinct signatures in the ICM in the form of shocks and diffuse cluster radio sources that provide evidence for the acceleration of relativistic particles. H…
Discovery of a radio relic in the low mass, merging galaxy cluster PLCK G200.9-28.2
Ruta Kale, Daniel R. Wik, Simona Giacintucci +5
Radio relics at the peripheries of galaxy clusters are tracers of the elusive cluster merger shocks. We report the discovery of a single radio relic in the galaxy cluster PLCK G200…
How to Produce an Arbitrarily Small Tensor to Scalar Ratio
Daniel J. Brooker
We construct a toy a model which demonstrates that large field single scalar inflation can produce an arbitrarily small scalar to tensor ratio in the window of e-foldings recoverab…
Sardinia Radio Telescope observations of Abell 194 - the intra-cluster magnetic field power spectrum
F. Govoni, M. Murgia, V. Vacca +30
We study the intra-cluster magnetic field in the poor galaxy cluster Abell 194 by complementing radio data, at different frequencies, with data in the optical and X-ray bands. We a…