Search Publications
Observations of magnetic flux ropes during magnetic reconnection in the Earth's magnetotail
Eastwood, J. P.; Taylor, M. G. G. T.; Borg, A. L.
We present an investigation of magnetic flux ropes observed by the four Cluster spacecraft during periods of magnetic reconnection in the Earth's magnetotail. Using a list of 21 Cluster encounters with the reconnection process in the period 2001-2006 identified in Borg et al. (2012), we present the distribution and characteristics of the flux rope…
HD 172555: detection of 63 µm [OI] emission in a debris disc
Pinte, C.; Ménard, F.; Duchêne, G. +14 more
Context.
Investigating the Reliability of Coronal Emission Measure Distribution Diagnostics using Three-dimensional Radiative Magnetohydrodynamic Simulations
Testa, Paola; Martínez-Sykora, Juan; De Pontieu, Bart +2 more
Determining the temperature distribution of coronal plasmas can provide stringent constraints on coronal heating. Current observations with the Extreme ultraviolet Imaging Spectrograph (EIS) on board Hinode and the Atmospheric Imaging Assembly (AIA) on board the Solar Dynamics Observatory provide diagnostics of the emission measure distribution (E…
The XMM-BCS galaxy cluster survey. I. The X-ray selected cluster catalog from the initial 6 deg2
Finoguenov, A.; Böhringer, H.; Pratt, G. W. +19 more
The XMM-Newton-Blanco Cosmology Survey project (XMM-BCS) is a coordinated X-ray, optical and mid-infrared cluster survey in a field also covered by Sunyaev-Zel'dovich effect (SZE) surveys by the South Pole Telescope and the Atacama Cosmology Telescope. The aim of the project is to study the cluster population in a 14 deg2 field (center:…
Hot and cold ion outflow: Spatial distribution of ion heating
Nilsson, H.; Slapak, R.; André, M. +2 more
Ions apparently emanating from the same source, the ionospheric polar cap, can either end up as energized to keV energies in the high-altitude cusp/mantle, or appear as cold ions in the magnetotail lobes. We use Cluster observations of ions and wave electric fields to study the spatial variation of ion heating in the cusp/mantle and polar cap. The…
The First Maximum-light Ultraviolet through Near-infrared Spectrum of a Type Ia Supernova
Filippenko, Alexei V.; Foley, Ryan J.; Kirshner, Robert P. +21 more
We present the first maximum-light ultraviolet (UV) through near-infrared (NIR) Type Ia supernova (SN Ia) spectrum. This spectrum of SN 2011iv was obtained nearly simultaneously by the Hubble Space Telescope at UV/optical wavelengths and the Magellan Baade telescope at NIR wavelengths. These data provide the opportunity to examine the entire maxim…
Precursor of Sunspot Penumbral Formation Discovered with Hinode Solar Optical Telescope Observations
Shimizu, Toshifumi; Ichimoto, Kiyoshi; Suematsu, Yoshinori
We present observations of a precursory signature that would be helpful for understanding the formation process of sunspot penumbrae. The Hinode Solar Optical Telescope successfully captured the entire evolution of a sunspot from the pore to a large well-developed sunspot with penumbra in an emerging flux region appearing in NOAA Active Region 110…
AGN-host galaxy connection: morphology and colours of X-ray selected AGN at z ≤ 2
Castañeda, H.; Cepa, J.; Bongiovanni, A. +11 more
Context. The connection between active galactic nuclei (AGN) and their host galaxies has been widely studied and found to be of great importance for providing answers to some fundamental questions related to AGN fuelling mechanisms, and both their formation and evolution.
Aims: Using X-ray data and one of the deepest broad-band optical data s…
Measuring the Solar Radius from Space during the 2003 and 2006 Mercury Transits
Kuhn, J. R.; Bush, R. I.; Emilio, M. +1 more
The Michelson Doppler Imager (MDI) aboard the Solar and Heliospheric Observatory observed the transits of Mercury on 2003 May 7 and 2006 November 8. Contact times between Mercury and the solar limb have been used since the seventeenth century to derive the Sun's size but this is the first time that high-quality imagery from space, above the Earth'…
Three-dimensional interferometric, spectrometric, and planetary views of Procyon
Matter, A.; Lopez, B.; Kervella, P. +5 more
Context. Procyon is one of the brightest stars in the sky and one of our nearest neighbours. It is therefore an ideal benchmark object for stellar astrophysics studies using interferometric, spectroscopic, and asteroseismic techniques.
Aims: We use a new realistic three-dimensional (3D) radiative-hydrodynamical (RHD) model atmosphere of Procy…