Search Publications
Missions
Journals
Publication Years
Characterizing the particle size distribution of Saturn's A ring with Cassini UVIS occultation data
Colwell, Joshua E.; Esposito, Larry W.; Becker, Tracy M. +1 more
Stellar occultation data from Cassini's Ultraviolet Imaging Spectrograph (UVIS) have revealed diffraction spikes near sharp edges in Saturn's rings. The UVIS High Speed Photometer (HSP) observes these spikes as signals at ring edges that surpass measurements of the unocculted stellar signal. In Saturn's A ring, diffracted light can augment the dir…
The Gini Coefficient as a Tool for Image Family Idenitification in Strong Lensing Systems with Multiple Images
Sharon, Keren; Florian, Michael K.; Gladders, Michael D. +1 more
The sample of cosmological strong lensing systems has been steadily growing in recent years and with the advent of the next generation of space-based survey telescopes, the sample will reach into the thousands. The accuracy of strong lens models relies on robust identification of multiple image families of lensed galaxies. For the most massive len…
SILC: a new Planck internal linear combination CMB temperature map using directional wavelets
Leistedt, Boris; Peiris, Hiranya V.; Pontzen, Andrew +2 more
We present new clean maps of the cosmic microwave background (CMB) temperature anisotropies (as measured by Planck) constructed with a novel internal linear combination (ILC) algorithm using directional, scale-discretized wavelets - scale-discretized, directional wavelet ILC or Scale-discretised, directional wavelet Internal Linear Combination (SI…
Model-independent characterisation of strong gravitational lenses
Bartelmann, M.; Wagner, J.
We develop a new approach to extracting model-independent information from observations of strong gravitational lenses. The approach is based on the generic properties of images near the fold and cusp catastrophes in caustics and critical curves. The observables we used are the relative image positions, the magnification ratios and ellipticities o…
Dynamics of a Prominence-horn Structure during Its Evaporation in the Solar Corona
Liu, Wei; Li, Xing; Chen, Yao +3 more
The physical connections among and formation mechanisms of various components of the prominence-horn cavity system remain elusive. Here we present observations of such a system, focusing on a section of the prominence that rises and separates gradually from the main body. This forms a configuration sufficiently simple to yield clues regarding the …
Identification of z ≳ 2 Herschel 500 µM Sources Using Color Deconfusion
Elbaz, D.; Ferguson, H. C.; Leiton, R. +19 more
We present a new method to search for candidate z ≳ 2 Herschel 500 µm sources in the Great Observatories Origins Deep Survey-North field using a S500 µm/S24 µm “color deconfusion” technique. Potential high-z sources are selected against low-redshift ones from their large 500 to 24 µm flux density ratio…
Star Formation in Intermediate Redshift 0.2 < z < 0.7 Brightest Cluster Galaxies
Baum, Stefi A.; O'Dea, Christopher P.; Cooke, Kevin C. +3 more
We present a multi-wavelength photometric and spectroscopic study of 42 Brightest Cluster Galaxies (BCGs) in two samples of galaxy clusters chosen for a gravitational lensing study. The study’s initial sample combines 25 BCGs from the Cluster Lensing and Supernova Survey with Hubble sample and 37 BCGs from the Sloan Giant Arcs Survey with a total …
Evolution of active region outflows throughout an active region lifetime
Poletto, G.; Zangrilli, L.
Context. We have shown previously that SOHO/UVCS data allow us to detect active region (AR) outflows at coronal altitudes higher than those reached by other instrumentation. These outflows are thought to be a component of the slow solar wind.
Aims: Our purpose is to study the evolution of the outflows in the intermediate corona from AR 8100, …
The Environment of z > 1 3CR Radio Galaxies and QSOs: From Proto-clusters to Clusters of Galaxies?
Macchetto, F. D.; Capetti, A.; Sparks, W. B. +8 more
We study the cluster environment for a sample of 21 radio loud active galactic nuclei from the 3CR catalog at z\gt 1, 12 radio galaxies (RGs) and nine quasars, with Hubble Space Telescope (HST) images in the optical and IR. We use two different approaches to determine cluster candidates. We identify the early-type galaxies (ETGs) in every field by…
How unusual is the cool-core radio halo cluster CL1821+643?
Kale, Ruta; Parekh, Viral
Massive galaxy clusters with cool cores typically host diffuse radio sources called mini-haloes, whereas, those with non-cool cores host radio haloes. We attempt to understand the unusual nature of the cool-core galaxy cluster CL1821+643, which hosts a megaparsec-scale radio halo, using new radio observations and morphological analysis of its intr…