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An overview of the descent and landing of the Huygens probe on Titan
Lebreton, Jean-Pierre; Witasse, Olivier; Matson, Dennis L. +9 more
Titan, Saturn's largest moon, is the only Solar System planetary body other than Earth with a thick nitrogen atmosphere. The Voyager spacecraft confirmed that methane was the second-most abundant atmospheric constituent in Titan's atmosphere, and revealed a rich organic chemistry, but its cameras could not see through the thick organic haze. After…
Positron annihilation spectrum from the Galactic Centre region observed by SPI/INTEGRAL
Sunyaev, R.; Revnivtsev, M.; Sazonov, S. +2 more
The electron-positron annihilation spectrum observed by SPI/INTEGRAL during deep Galactic Centre region exposure is reported. The line energy (510.954+/-0.075 keV) is consistent with the unshifted annihilation line. The width of the annihilation line is 2.37 +/- 0.25 keV (full width at half-maximum), while the strength of the ortho-positronium con…
Quasi-perpendicular Shock Structure and Processes
Balogh, A.; Thomsen, M. F.; Lembège, B. +11 more
Temperatures, Winds, and Composition in the Saturnian System
Strobel, D. F.; Showalter, M. R.; Lellouch, E. +43 more
Stratospheric temperatures on Saturn imply a strong decay of the equatorial winds with altitude. If the decrease in winds reported from recent Hubble Space Telescope images is not a temporal change, then the features tracked must have been at least 130 kilometers higher than in earlier studies. Saturn's south polar stratosphere is warmer than pred…
High-Energy Gamma Rays from the Massive Black Hole in the Galactic Center
Aharonian, F.; Neronov, A.
Accreting black holes (BHs) are believed to be sites of possible particle acceleration with conditions that are also favorable for effective gamma-ray production. However, because of photon-photon pair production, only low-energy (MeV) gamma rays can escape these compact objects with typically very large compactness parameters, κ=(L/LEdd
Interplanetary flux rope ejected from an X-ray bright point. The smallest magnetic cloud source-region ever observed
Mandrini, C. H.; van Driel-Gesztelyi, L.; Démoulin, P. +5 more
Using multi-instrument and multi-wavelength observations (SOHO/MDI and EIT, TRACE and Yohkoh/SXT), as well as computing the coronal magnetic field of a tiny bipole combined with modelling of Wind in situ data, we provide evidences for the smallest event ever observed which links a sigmoid eruption to an interplanetary magnetic cloud (MC). The tiny…
Summer Evolution of the North Polar Cap of Mars as Observed by OMEGA/Mars Express
Bibring, J. -P.; Gondet, B.; Langevin, Y. +3 more
The Observatoire pour la Minéralogie, l'Eau, les Glaces, et l'Activité (OMEGA) visible-infrared imaging spectrometer extensively observed regions of Mars with latitudes above 70°N in late 2004 (heliocentric longitude from Ls 93° to Ls 127°). The extent of water ice at the surface and the size of ice grains were monitored as a…
Quasars and the Big Blue Bump
Kaiser, Mary Elizabeth; Green, Richard F.; Kriss, Gerard A. +10 more
We investigate the ultraviolet-to-optical spectral energy distributions of 17 active galactic nuclei (AGNs) using quasi-simultaneous spectrophotometry spanning 900-9000 Å (rest frame). We employ data from the Far Ultraviolet Spectroscopic Explorer, the Hubble Space Telescope, and the 2.1 m telescope at Kitt Peak National Observatory. Taking advant…
Ices in the Edge-on Disk CRBR 2422.8-3423: Spitzer Spectroscopy and Monte Carlo Radiative Transfer Modeling
van Dishoeck, Ewine F.; Dullemond, Cornelis P.; Pontoppidan, Klaus M. +5 more
We present 5.2-37.2 µm spectroscopy of the edge-on circumstellar disk CRBR 2422.8-3423 obtained using the Infrared Spectrograph (IRS) of the Spitzer Space Telescope. The IRS spectrum is combined with ground-based 3-5 µm spectroscopy to obtain a complete inventory of solid-state material present along the line of sight toward the source…
First Results from the CHARA Array. I. An Interferometric and Spectroscopic Study of the Fast Rotator α Leonis (Regulus)
Gies, D. R.; Berger, D. H.; McAlister, H. A. +13 more
We report on K-band interferometric observations of the bright, rapidly rotating star Regulus (type B7 V) made with the CHARA Array on Mount Wilson, California. Through a combination of interferometric and spectroscopic measurements, we have determined for Regulus the equatorial and polar diameters and temperatures, the rotational velocity and per…