Search Publications
Cassini/CAPS observations of duskside tail dynamics at Saturn
Thomsen, M. F.; Wilson, R. J.; Tokar, R. L. +2 more
properties of Saturn's premidnight tail region are surveyed using Cassini/Cassini Plasma Spectrometer (CAPS) ion observations from 2010. Only low-latitude (|lat| < 6°) intervals in which the CAPS viewing was roughly symmetric inward and outward around the corotation direction are used. Our numerical moments algorithm returns nonzero ion density…
Long-term variability of extragalactic radio sources in the Planck Early Release Compact Source Catalogue
Dickinson, C.; López-Caniego, M.; Partridge, B. +5 more
Combining measurements taken using the Wilkinson Microwave Anisotropy Probe (WMAP) from 2001 to 2008 with measurements taken using Planck from 2009 to 2010, we investigate the long-term flux density variability of extragalactic radio sources selected from the Planck Early Release Compact Source Catalogue. The single-year, single-frequency WMAP map…
A Filament Eruption on 2010 October 21 from Three Viewpoints
Filippov, Boris
A filament eruption on 2010 October 21 observed from three different viewpoints by the Solar Terrestrial Relations Observatory and the Solar Dynamic Observatory is analyzed by also invoking data from the Solar and Heliospheric Observatory and the Kanzelhoehe Solar Observatory. The position of the filament just before the eruption at the central me…
Solar Wind Conditions and Composition During the Genesis Mission as Measured by in situ Spacecraft
Neugebauer, Marcia; Wiens, Roger C.; Zurbuchen, Thomas H. +4 more
We describe the Genesis mission solar-wind sample collection period and the solar wind conditions at the L1 point during this 2.3-year period. In order to relate the solar wind samples to solar composition, the conditions under which the samples were collected must be understood in the context of the long-term solar wind. We find that the state of…
Spatially extended OH+ emission from the Orion Bar and Ridge
Ossenkopf, V.; Nagy, Z.; Bergin, E. A. +5 more
Context. The reactive HnO+ ions (OH+, H2O+ and H3O+) are widespread in the interstellar medium and act as precursors to the H2O molecule. While HnO+ absorption is seen on many Galactic lines of sight, active galactic nuclei often show the …
Linear Structures in the Core of the Coma Cluster of Galaxies
Simionescu, A.; Churazov, E.; Fabian, A. C. +4 more
The hot x-ray-emitting plasma in galaxy clusters is predicted to have turbulent motion, which can contribute around 10% of the cluster’s central energy density. We report deep Chandra X-ray Observatory observations of the Coma cluster core, showing the presence of quasi-linear high-density arms spanning 150 kiloparsecs, consisting of low-entropy m…
The Dynamical State of the Serpens South Filamentary Infrared Dark Cloud
Nakamura, Fumitaka; Shimajiri, Yoshito; Kawabe, Ryohei +6 more
We present the results of N2H+ (J = 1-0) observations toward Serpens South, the nearest cluster-forming, infrared dark cloud. The physical quantities are derived by fitting the hyperfine structure of N2H+. The Herschel and 1.1 mm continuum maps show that a parsec-scale filament fragments into three clump…
The ring nebula around the blue supergiant SBW1: pre-explosion snapshot of an SN 1987A twin
Filippenko, Alexei V.; Smith, Nathan; Ginsburg, Adam +2 more
SBW1 is a B-type supergiant surrounded by a ring nebula that is a nearby twin of SN 1987A's progenitor and its circumstellar ring. We present images and spectra of SBW1 obtained with the Hubble Space Telescope (HST), the Spitzer Space Telescope and Gemini South. HST images of SBW1 do not exhibit long Rayleigh-Taylor (RT) fingers, which are presume…
Diffusion of Solar Magnetic Elements up to Supergranular Spatial and Temporal Scales
Gošić, M.; Orozco Suárez, D.; Bellot Rubio, L. +3 more
The study of spatial and temporal scales on which small magnetic structures (magnetic elements) are organized in the quiet Sun may be approached by determining how they are transported on the solar photosphere by convective motions. The process involved is diffusion. Taking advantage of Hinode high spatial resolution magnetograms of a quiet-Sun re…
NuSTAR Observations of Magnetar 1E 1841-045
An, Hongjun; Hailey, Charles J.; Kaspi, Victoria M. +18 more
We report new spectral and temporal observations of the magnetar 1E 1841-045 in the Kes 73 supernova remnant obtained with the Nuclear Spectroscopic Telescope Array. Combined with new Swift and archival XMM-Newton and Chandra observations, the phase-averaged spectrum is well characterized by a blackbody plus double power law, in agreement with pre…