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Observations of lion roars in the magnetosheath by the STAFF/DWP experiment on the Double Star TC-1 spacecraft
Walker, S. N.; Yearby, K. H.; Santolik, O. +5 more
Lion roars are intense, short duration packets of whistler mode waves, observed in the magnetosheath. They are typically seen coincident with the magnetic field minima of mirror mode waves. The orbit of the Double Star TC-1 spacecraft (570 km by 78970 km, inclination at 28.5 degrees) is ideal for observations of lion roars as the spacecraft is in …
Iron Fluorescent Line Emission from Black Hole Accretion Disks with Magnetic Reconnection-heated Corona
Iwasawa, K.; Mineshige, S.; Kawanaka, N.
We investigate the iron Kα fluorescent line produced by hard X-ray photons from the magnetic reconnection-heated corona. The hot corona with temperature of ~109 K can irradiate the underlying disk with a continuum X-ray spectrum produced via thermal Comptonization. Then the iron atoms in the disk photoelectrically absorb X-ray photons a…
SMART-1 after lunar capture: First results and perspectives
Schmidt, W.; Grande, M.; Keller, H. U. +19 more
Understanding Galaxy Formation with ISO Deep Surveys
Elbaz, David
We present the results obtained through the various ISO extragalactic deep surveys. Although IRAS revealed the existence of galaxies forming stars at a rate of a few tens (LIRGs) or even hundreds (ULIRGs) solar masses in the local universe, ISO not only discovered that these galaxies were already in place at redshift one, but also that they are no…
X-ray absorption and re-emission from an ionized outflow in the Type 1 quasi-stellar object 2MASS 234449+1221 observed by XMM-Newton
Wilkes, B. J.; Page, K. L.; Pounds, K. A.
We report on the analysis of a short XMM-Newton observation of the reddened Type 1 quasi-stellar object (QSO) 2MASS 234449+1221 first identified in the Two-Micron All-Sky Survey (2MASS). The underlying X-ray continuum is found to be typical of a broad-line active galaxy, with photon index Γ~ 1.9. Low-energy absorption can be modelled by a column N…
Intense Diffuse Far-Ultraviolet Emission from the Orion Nebula
Henry, R. C.; Murthy, Jayant; Sahnow, David J.
We present spectra of the diffuse far-UV (900-1200 Å) emission from a region near the Orion Nebula: the first high-resolution spectra of the diffuse background radiation. These observations were made using serendipitous Far Ultraviolet Spectroscopic Explorer (FUSE) observations and were only possible because of the strength of the diffuse emission…
Huygens probe entry and descent trajectory analysis and reconstruction techniques
Lebreton, J. -P.; Ferri, F.; Gaborit, V. +2 more
Cassini/Huygens is a joint National Aeronautics and Space Administration (NASA)/European Space Agency (ESA)/Agenzia Spaziale Italiana (ASI) mission on its way to explore the Saturnian system. The ESA Huygens Probe is scheduled to be released from the Orbiter on 25 December 2004 and enter the atmosphere of Titan on 14 January 2005. Probe delivery t…
Streamers and adjacent regions observed by UVCS/SOHO: A comparison between different phases of solar activity
Romoli, M.; Spadaro, D.; Ventura, R. +1 more
UVCS/SOHO observations of the O VI resonance doublet and H I Lyα line intensities and profiles, together with measurements of the visible linearly polarized radiance, have been performed during two MEDOC campaigns in 1997 and 2000, i.e. near solar minimum and approaching the solar maximum phase, respectively. During both observational runs mid-lat…
HST Images Do Not Support the Presence of Three High-Velocity, Low-Mass Runaway Stars in the Core of the Orion Nebula Cluster
O'Dell, C. R.; Robberto, Massimo; Poveda, Arcadio +1 more
A recent article has employed the determination from ground-based images of high proper motions in the Orion Nebula cluster to argue that JW 349, JW 355, and JW 451 are high-velocity (38, 89, and 69 km s-1, respectively) low-mass runaway stars. We report on the measurement of the proper motions of these stars using images made by the Hu…
On the nature of the unidentified solar emission near 117 nm
Bertaux, J. -L.; Wilhelm, K.; Marsch, E. +6 more
Spectral observations of the Sun in the vacuum-ultraviolet wavelength range by SUMER on SOHO led to the discovery of unusual emission features - called humps here - at 116.70 nm and 117.05 nm on either side of the He i 58.43 nm line. This resonance line is seen in the second order of diffraction, whereas the humps are recorded in the first order w…