Search Publications
The origin of the X-ray-emitting plasma in the eastern edge of the Cygnus Loop
Miceli, Marco; Orlando, Salvatore; Bocchino, Fabrizio +2 more
The Cygnus Loop is interacting with a protrusion of the cavity wall in its eastern edge (the XA region), where the X-ray emission is very bright. The complexity of the environment and the non-linear physical processes of the shock-cloud interaction make the origin of the X-ray emission still not well understood. Our purpose is to understand the ph…
Modelling Herschel observations of infrared-dark clouds in the Hi-GAL survey
Griffin, M. J.; Ward-Thompson, D.; Molinari, S. +5 more
We demonstrate the use of the 3D Monte Carlo radiative transfer code PHAETHON to model infrared-dark clouds (IRDCs) that are externally illuminated by the interstellar radiation field (ISRF). These clouds are believed to be the earliest observed phase of high-mass star formation, and may be the high-mass equivalent of lower mass pre-stellar cores.…
Planetary science: Tectonic overturn on Enceladus
Helfenstein, Paul
The south pole of Saturn's icy moon Enceladus is anomalously warm, geologically youthful and cryovolcanically active. Episodic convective overturn explains how the moon's modest sources of internal heat can be channelled into intense geological activity.
Pre-Flare Flows in the Corona
van Driel-Gesztelyi, L.; Green, L. M.; Harra, L. K. +2 more
Solar flares take place in regions of strong magnetic fields and are generally accepted to be the result of a resistive instability leading to magnetic reconnection. When new flux emerges into a pre-existing active region it can act as a flare and coronal mass ejection trigger. In this study we observed active region 10955 after the emergence of s…
Transient Phenomena in the Distant Solar Wind and in the Heliosheath
McComas, D. J.; Pogorelov, N. V.; Burlaga, L. F. +6 more
The difference in the heliocentric distances at which the Voyager 1 and Voyager 2 spacecraft crossed the termination shock (TS) is likely due to a combination of the heliospheric asymmetry caused by the interstellar magnetic field (ISMF) and time-dependent boundary conditions at the Sun. We analyze both effects numerically. It is shown that an inc…
Warm absorber and truncated accretion disc in IRAS 05078+1626
Guainazzi, M.; Karas, V.; Svoboda, J.
Context. X-ray observations of unabsorbed active galactic nuclei provide an opportunity to explore the innermost regions of supermassive black hole accretion discs.
Aims: Our goal in this paper is to investigate the central environment of a Seyfert 1.5 galaxy IRAS 05078+1626.
Methods: We studied the time-averaged spectrum obtained with t…
Transient Structures and Stream Interaction Regions in the Solar Wind: Results from EISCAT Interplanetary Scintillation, STEREO HI and Venus Express ASPERA-4 Measurements
Grande, M.; Harrison, R. A.; Davies, J. A. +7 more
We discuss the detection and evolution of a complex series of transient and quasi-static solar-wind structures in the days following the well-known comet 2P/Encke tail disconnection event in April 2007. The evolution of transient solar-wind structures ranging in size from <105 km to >106 km was characterised using one-m…
Solar system: Recipe for making Saturn's rings
Charnoz, Sébastien; Crida, Aurélien
Simulations show that the still-mysterious origin of Saturn's vast, icy rings could be explained by the 'peeling' by Saturn's tides of the icy mantle of a large satellite migrating towards the planet. See Letter p.943
Calibration of the C1XS instrument on Chandrayaan-1
Howe, C. J.; Kellett, B. J.; Narendranath, S. +5 more
The Chandrayaan-1 X-ray spectrometer (C1XS) experiment on the Chandrayaan-1 mission was designed to carry out spectroscopic observations in the 1-10 keV range for deriving lunar chemistry. We present results from the ground calibration of the Swept Charge Devices (SCDs) on C1XS at the RESIK X-ray beam facility at Rutherford Appleton Laboratory, Ch…
Evolution of the X-ray profiles of poor clusters from the XMM-LSS survey
Pierre, Marguerite; Pacaud, Florian; Ponman, Trevor +1 more
A sample consisting of 27 X-ray-selected galaxy clusters from the X-ray Multi-Mirror Large-Scale Structure (XMM-LSS) survey is used to study the evolution in the X-ray surface brightness profiles of the hot intracluster plasma. These systems are mostly groups and poor clusters, with temperatures 0.6-4.8keV, spanning the redshift range 0.05 to 1.05…