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Statistics of relativistically broadened Fe Kα lines in AGN
Bianchi, S.; Guainazzi, M.; Dovčiak, M.
We present preliminary results on the properties of relativistically broadened Fe Kα lines in a collection of more then 100 Active Galactic Nuclei (AGN) observed by the XMM-Newton EPIC-pn camera. Our main conclusions can be summarized as follows: a) we detect broad lines in about 25% of the sample objects. This fraction increases to 42 ± 13 % if w…
Debris-covered piedmont glaciers along the northwest flank of the Olympus Mons scarp: Evidence for low-latitude ice accumulation during the Late Amazonian of Mars
Head, James W.; Marchant, David R.; Milkovich, Sarah M.
We use Viking and new MGS and Odyssey data to characterize the lobate deposits superimposed on aureole deposits along the west and northwest flanks of Olympus Mons, Mars. These features have previously been interpreted variously as landslide, pyroclastic, lava flow or glacial features on the basis of Viking images. The advent of multiple high-reso…
Properties of the energetic particle distributions during the October 28, 2003 solar flare from INTEGRAL/SPI observations
Kiener, J.; Tatischeff, V.; Weidenspointner, G. +1 more
Analysis of spectra obtained with the gamma-ray spectrometer SPI onboard INTEGRAL of the GOES X17-class flare on October 28, 2003 is presented. In the energy range 600 keV-8 MeV three prominent narrow lines at 2.223, 4.4 and 6.1 MeV, resulting from nuclear interactions of accelerated ions within the solar atmosphere could be observed. Time profile…
Absolute magnitudes of OB and Be stars based on Hipparcos parallaxes - II
Wegner, W.
A new method of determining absolute visual magnitudes of early-type stars, based on averaging Hipparcos parallaxes (ESA 1997) inside samples of the same spectrum and luminosity (Sp/L) classes, is proposed. The used sample consists of 6262 unreddened and reddened OB stars as well as 430 Be stars of luminosity classes Ia, Iab, Ib, II, III, IV and V…
Cassini/VIMS hyperspectral observations of the HUYGENS landing site on Titan
Le Mouélic, S.; Rodriguez, S.; Sotin, C. +8 more
Titan is one of the primary scientific objectives of the NASA-ESA-ASI Cassini-Huygens mission. Scattering by haze particles in Titan's atmosphere and numerous methane absorptions dramatically veil Titan's surface in the visible range, though it can be studied more easily in some narrow infrared windows. The Visual and Infrared Mapping Spectrometer…
Plateau de Bure interferometer observations of the disk and outflow of HH 30
Pety, J.; Gueth, F.; Guilloteau, S. +1 more
Context: .HH 30 is a well-known Pre-Main-Sequence star in Taurus. HST observations have revealed a flared, edge-on disk driving a highly-collimated optical jet, making this object a case study for the disk-jet-outflow paradigm.
Aims: .We searched for a molecular outflow, and attempted to better constrain the star and disk parameters.
Metho…
Detection of Six Trans-Neptunian Binaries with NICMOS: A High Fraction of Binaries in the Cold Classical Disk
Noll, Keith S.; Stephens, Denise C.
We have analyzed a homogeneous set of observations of 81 trans-Neptunian objects obtained with NIC2 on the Hubble Space Telescope with the goal of identifying partially resolved binaries. Using PSF fitting we have identified six likely binaries in addition to the three new binaries already found in this data set. We find that 11+5-…
On the intensity and spatial morphology of the 511 keV emission in the Milky Way
Prantzos, N.
The positron emissivity of the Galactic bulge and disk, resulting from radioactivity of SNIa, is reassessed in the light of a recent evaluation of the SNIa rate. It is found that the disk may supply more positrons than required by recent observations, but the bulge (where the characteristic e+ annihilation line at 511 keV is in fact obs…
The Deceleration of an Interplanetary Transient from the Sun to 5 Au
Tappin, S. J.
A CME which was first seen in LASCO is tracked through SMEI and on out to Ulysses. These measurements allow us to determine the deceleration and compare different models of the deceleration process. It is found that both a simple "snow plough" model and an aerodynamic drag model predict a much more rapid deceleration in the lower solar wind than i…
Luminosity function of contact binaries based on the All Sky Automated Survey (ASAS)
Rucinski, Slavek M.
The luminosity function for contact binary stars of the W UMa type is evaluated on the basis of the All Sky Automated Survey (ASAS) photometric project covering all stars south of δ=+ 28° within a magnitude range 8 < V < 13. Lack of colour indices enforced a limitation to 3374 systems with P < 0.562 d (i.e. 73 per cent of all systems with…