Search Publications
Missions
Journals
Publication Years
Is Pre-Eruptive Null Point Reconnection Required for Triggering Eruptions?
Li, Hui; Aulanier, Guillaume; Schmieder, Brigitte +1 more
We study the magnetic field evolution and topology of the active region NOAA 10486 before the 3B/X1.2 flare of October 26, 2003, using observational data from the French-Italian THEMIS telescope, the Michelson Doppler Imager (MDI) onboard Solar and Heliospheric Observatory (SOHO), the Solar Magnetic Field Telescope (SMFT) at Huairou Solar Observat…
A short review of relativistic iron lines from stellar-mass black holes
Miller, J. M.
% In this contribution, I briefly review recent progress in detecting and measuring the properties of relativistic iron lines observed in stellar-mass black hole systems, and the aspects of these lines that are most relevant to studies of similar lines in Seyfert-1 AGN. In particular, the lines observed in stellar-mass black holes are not complica…
The Interstellar N/O Abundance Ratio: Evidence for Local Infall?
Meyer, David M.; Lauroesch, James T.; Knauth, David C.
Sensitive measurements of the interstellar gas-phase oxygen abundance have revealed a slight oxygen deficiency (~15%) toward stars within 500 pc of the Sun as compared to more distant sight lines. Recent FUSE observations of the interstellar gas-phase nitrogen abundance indicate larger variations, but no trends with distance were reported due to t…
Next generation of pnCCDs for X-ray spectroscopy and imaging
Meidinger, Norbert; Strüder, Lothar; Herrmann, Sven +10 more
A special type of charge-coupled device, the pnCCD, has been developed in the nineties as focal-plane detector for the X-ray astronomy mission XMM-Newton of the European Space Agency. The pnCCD detector has been in operation since the satellite launch in 1999. It is performing up to date spectroscopy of X-rays in combination with imaging and high …
Shock-cloud interaction in the Vela SNR. II. Hydrodynamic model
Miceli, M.; Bocchino, F.; Orlando, S. +1 more
Context: .In the framework of the study of the X-ray and optical emission in supernova remnants we focus on an isolated X-ray knot in the northern rim of the Vela SNR (Vela FilD), whose X-ray emission has been studied and discussed in Paper I.
Aims: .We aim at understanding the physical origin of the X-ray and optical emission in FilD, at unde…
Energetic Neutral Atoms (ENA) at Mars: Properties of the hydrogen atoms produced upstream of the martian bow shock and implications for ENA sounding technique around non-magnetized planets
Coates, A. J.; Kallio, E.; Fedorov, A. +43 more
We have studied the interaction of fast solar wind hydrogen atoms with the martian atmosphere by a three-dimensional Monte Carlo simulation. These energetic neutral hydrogen atoms, H-ENAs, are formed upstream of the martian bow shock. Both H-ENAs scattered and non-scattered from the martian atmosphere/exosphere were studied. The colliding H-ENAs w…
Examining the Seyfert-Starburst Connection with Arcsecond-Resolution Radio Continuum Observations
Ryder, Stuart D.; Laine, Seppo; Beck, Rainer +2 more
We compare the arcsecond-scale circumnuclear radio continuum properties of five Seyfert and five starburst galaxies, concentrating on the search for any structures that could imply a spatial or causal connection between the nuclear activity and a circumnuclear starburst ring. No evidence is found in the radio emission for a link between the trigge…
Oxygen-rich disk in the V778 Cygni system resolved
Szczerba, R.; Richards, A. M. S.; Poutanen, J. +3 more
Aims.Various scenarios have been proposed to explain the presence of silicate features associated with carbon stars, such as
Methods: .The 22 GHz water maser emission from this star has been mapped using MERLIN wit…
Double-barred galaxies at intermediate redshifts: a feasibility study
Lisker, Thorsten; Debattista, Victor P.; Ferreras, Ignacio +1 more
Despite the increasing number of studies of barred galaxies at intermediate and high redshifts, double-barred (S2B) systems have only been identified in the nearby (z <= 0.04) universe thus far. In this feasibility study, we demonstrate that the detection and analysis of S2Bs is possible at intermediate redshifts (0.1 <~ z <~ 0.5) with th…
The Blue Straggler Population of the Globular Cluster M5: Comparison with M3
Warren, Steven R.; Bolte, Michael; Sandquist, Eric L.
We have surveyed the blue straggler star population of the Galactic globular cluster M5 using high-resolution images of the core along with wide-field ground-based images reaching to more than 19 core radii. To gauge M5's relative efficiency of producing stragglers, we compared our sample to five studies of other globular clusters. Using a ``brigh…