Search Publications
Revealing the Mid-Infrared Emission Structure of IRAS 16594-4656 and IRAS 07027-7934
García-Lario, P.; Acosta-Pulido, J. A.; García-Hernández, D. A. +3 more
TIMMI2 diffraction-limited mid-infrared images of a multipolar proto-planetary nebula IRAS 16594-4656 and a young [WC] elliptical planetary nebula IRAS 07027-7934 are presented. Their dust shells are for the first time resolved (only marginally in the case of IRAS 07027-7934) by applying the Lucy-Richardson deconvolution algorithm to the data, tak…
Fe emission and ionized excess absorption in the luminous quasar 3C 109 with XMM-Newton
Fabian, A. C.; Miniutti, G.; Ross, R. R. +2 more
We report results from an XMM-Newton observation of the broad-line radio galaxy 3C 109 (z = 0.3056). Previous ASCA data revealed the presence of a broad iron line from the accretion disc with which the XMM-Newton spectrum is fully consistent. However, although improving the ASCA constraints on the line parameters, the quality of the data is not hi…
Injection and propagation of solar protons to high heliospheric latitudes: Ulysses Ket observations
Kunow, H.; Heber, B.; Müller-Mellin, R. +3 more
The Ulysses spacecraft at high heliographic latitudes has detected eight large solar energetic particle events during the recent solar maximum in 2000 and 2001 years. These events are easily identified with famous episodes of the solar activity and the corresponding SEP events near the Earth. Analyzing the absolute intensities of ∼40 100 MeV proto…
Investigation of Titan Aerogravity Assist for Capture into Orbit About Saturn
Lyne, James; Ramsey, Philip
XMM-Newton Detection of the Supernova Remnant G337.2+0.1
Albacete Colombo, Juan F.; Benaglia, Paula; Combi, Jorge A. +1 more
We report the first XMM-Newton detection of the SNR candidate G337.2+0.1 (=AX J1635.9-4719). The object shows centrally filled and diffuse X-ray emission. The emission peaks in the hard 3.0-10.0 keV band. A spatially resolved spectral study confirms that the column density of the central part of the SNR is about NH~5.9(+/-1.5)×1022…
Planetary science: Saturn's bared mini-moons
Schmidt, Jürgen; Spahn, Frank
Propeller-shaped structures seem to reveal the presence of moonlets, about 100 metres in diameter, embedded in Saturn's rings. This discovery adds to our picture of how the rings formed and are evolving.
Neon dewar for the X-ray spectrometer onboard Suzaku
Mitsuda, K.; Kelley, R. L.; Fujimoto, R. +6 more
The X-ray spectrometer (XRS) onboard Suzaku is the first X-ray microcalorimeter array in orbit. The sensor array is operated at 60 mK, which is attained by an adiabatic demagnetization refrigerator and superfluid liquid helium. The neon dewar is a vacuum-insulated container for the XRS. The requirements for the XRS dewar are to maintain the detect…
Titan, Fractals, and Filtering of Cassini Altimeter Data
Callahan, P.; Wall, S. D.; Riccio, D. +2 more
An ionized disc reflection component for the X-ray spectrum of NGC 4051 and IRAS13224-3809?
Cappi, M.; Ponti, G.; Fabian, A. C. +2 more
A spectral variability study of the two Narrow Line Seyfert 1 galaxies NGC 4051 and IRAS13224-3809 is presented. Both sources show a high degree of flux and spectral variability. The nuclear emission, lightly absorbed by warm material, has been decomposed into a direct power law emission and an ionized disc reflection plus constant emission from d…
Spin of Planetary Probes in Atmospheric Flight
Lorenz, R. D.
Probes that enter planetary atmospheres are often spun during entry or descent for a variety of reasons. Their spin rate histories are influenced by often subtle effects. The spin requirements, control methods and flight experience from planetary and earth entry missions are reviewed. An interaction of the probe aerodynamic wake with a drogue para…