Search Publications
ICMEs at High Latitudes and in the Outer Heliosphere. Report of Working Group H
Lario, D.; Balogh, A.; Rodriguez, L. +14 more
Interplanetary coronal mass ejections (ICMEs) propagate into the outer heliosphere, where they can have a significant effect on the structure, evolution, and morphology of the solar wind, particularly during times of high solar activity. They are known to play an important role in cosmic ray modulation and the acceleration of energetic particles. …
Semiempirically derived heating function of the corona heliosphere during the Whole Sun Month
Sittler, E. C.; Guhathakurta, M.; Ofman, L.
In spite of many recent developments in observations and models of the solar corona, the exact form of the heating function of the solar wind plasma is unknown. Here we attempt to make some progress on that problem by applying a previously developed simplified magnetohydrodynamic model to a unique synthesis of remote sensing coronal observations f…
Star-forming Galaxies at Intermediate Redshifts: Morphology, Ages, and Sizes
Casertano, S.; Dahlen, T.; de Mello, D. F. +2 more
We present an analysis of the deepest near-UV image obtained with the Hubble Space Telescope using the WFPC2 (F300W) as part of the parallel observations of the Hubble Ultra Deep Field campaign. The U-band 10 σ limiting magnitude measured over 0.2 arcsec2 is mAB=27.5, which is 0.5 mag deeper than that in the Hubble Deep Field…
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…