Search Publications
On the origin of magnetosheath plasmoids and their relation to magnetosheath jets
Gunell, H.; Nilsson, H.; Hamrin, M. +4 more
We investigate localized magnetosheath and solar wind density enhancements, associated with clear magnetic field changes, and therefore referred to as magnetosheath/solar wind plasmoids, respectively. Using Cluster data, we show that there are two distinct populations of magnetosheath plasmoids, one associated with a decrease of magnetic field str…
Suzaku X-ray study of the double radio relic galaxy cluster CIZA J2242.8+5301
Kaastra, J. S.; van Weeren, R. J.; Brüggen, M. +7 more
Context. We present the results from Suzaku observations of the merging cluster of galaxies
Aims: To study the physics of gas heating and particle acceleration in cluster mergers, we investigated the X-ray emission from
Detecting dark matter substructures around the Milky Way with Gaia
Feldmann, Robert; Spolyar, Douglas
Cold dark matter (CDM) theory, a pillar of modern cosmology and astrophysics, predicts the existence of a large number of starless dark matter haloes surrounding the Milky Way (MW). However, clear observational evidence of these `dark' substructures remains elusive. Here, we present a detection method based on the small, but detectable, velocity c…
Herschel-ATLAS: the surprising diversity of dust-selected galaxies in the local submillimetre Universe
Ivison, R. J.; de Zotti, G.; Baes, M. +20 more
We present the properties of the first 250 µm blind sample of nearby galaxies (15 < D < 46 Mpc) containing 42 objects from the Herschel Astrophysical Terahertz Large Area Survey. Herschel's sensitivity probes the faint end of the dust luminosity function for the first time, spanning a range of stellar mass (7.4 < M⋆ < …
The identification of dust heating mechanisms in nearby galaxies using Herschel 160/250 and 250/350 µm surface brightness ratios
Boquien, M.; Bianchi, S.; Fritz, J. +15 more
We examined variations in the 160/250 and 250/350 µm surface brightness ratios within 24 nearby (<30 Mpc) face-on spiral galaxies observed with the Herschel Space Observatory to identify the heating mechanisms for dust emitting at these wavelengths. The analysis consisted of both qualitative and quantitative comparisons of the 160/250 and…
Does the Presence of Planets Affect the Frequency and Properties of Extrasolar Kuiper Belts? Results from the Herschel Debris and Dunes Surveys
Duchêne, G.; Eiroa, C.; Marshall, J. P. +14 more
The study of the planet-debris disk connection can shed light on the formation and evolution of planetary systems and may help “predict” the presence of planets around stars with certain disk characteristics. In preliminary analyses of subsamples of the Herschel DEBRIS and DUNES surveys, Wyatt et al. and Marshall et al. identified a tentative corr…
The Comptonization of accretion disc X-ray emission: consequences for X-ray reflection and the geometry of AGN coronae
Gallo, L. C.; Wilkins, D. R.
We consider the Comptonization of the photons that make up the relativistically blurred reflection that is commonly detected from the accretion discs of active galactic nuclei by the coronae of energetic particles believed to give rise to the powerful X-ray continua by the inverse-Compton scattering of thermal seed photons from the disc. Recent me…
Properties and origin of subproton-scale magnetic holes in the terrestrial plasma sheet
Burgess, D.; Sundberg, T.; Haynes, C. T.
Electron-scale magnetic depressions in the terrestrial plasma sheet are studied using Cluster multispacecraft data. The structures, which have an observed duration of ~5-10 s, are approximately 200-300 km wide in the direction of propagation, and they show an average reduction in the background magnetic field of 10-20%. A majority of the events ar…
Quasi-periodic Fluctuations and Chromospheric Evaporation in a Solar Flare Ribbon Observed by IRIS
Brosius, Jeffrey W.; Daw, Adrian N.
The Interface Region Imaging Spectrograph (IRIS) satellite obtained rapid cadence (9.4 s) stare spectra of an M7 flare ribbon in AR 12036 on 2014 April 18. Chromospheric and transition region line emission exhibited quasi-periodic intensity and velocity fluctuations in the ribbon prior to the appearance of Fe xxi emission. Seven intensity peaks we…
Structural mapping of Enceladus and implications for formation of tectonized regions
Crow-Willard, Emma N.; Pappalardo, Robert T.
Global structural mapping of high-resolution Cassini images of Enceladus reveals a richly varied surface. Most notable are three main regions of deformation each containing multiple structural units. In addition to the well known "South Polar Terrain" (SPT), there are two other large regions of deformation that we term "Leading Hemisphere Terrain"…