Search Publications
Giant outburst of EXO 2030+375: pulse-phase resolved analysis of INTEGRAL data
Klochkov, D.; Santangelo, A.; Ferrigno, C. +1 more
In June-September 2006 the Be/X-ray binary EXO 2030+375 experienced the second giant outburst since its discovery. The source was shown to have a complicated pulse-averaged X-ray spectral continuum with possible evidence of cyclotron absorption features. In this paper we present the first pulse-phase resolved analysis of the broad band X-ray spect…
Investigation of water vapor on Mars with PFS/SW of Mars Express
Lellouch, E.; Ignatiev, N. I.; Fouchet, T. +4 more
New insight into the seasonal, diurnal and spatial distribution of water vapor on Mars has been obtained from analyzing the spectra of the short-wavelength channel (SW) of the Planetary Fourier Spectrometer (PFS) onboard Mars Express. The processed dataset, recorded between January 2004 and April 2005, covers the seasons from L=331° of Mars Year 2…
Suzaku Wide-Band X-Ray Spectroscopy of the Seyfert2 AGN in NGC 4945
Done, Chris; Isobe, Naoki; Gandhi, Poshak +13 more
Suzaku observed a nearby Seyfert2 galaxy, NGC 4945, which hosts one of the brightest active galactic nuclei above 20keV. Combining data from the two detectors aboard Suzaku, the AGN intrinsic nuclear emission and its reprocessed signals were observed simultaneously. The intrinsic emission is highly obscured with an absorbing column of ∼5×1024…
Solar Cycle Related Changes at the Base of the Convection Zone
Basu, Sarbani; Baldner, Charles S.
The frequencies of solar oscillations are known to change with solar activity. We use principal component analysis to examine these changes with high precision. In addition to the well-documented changes in solar normal mode oscillations with activity as a function of frequency, which originate in the surface layers of the Sun, we find a small but…
SWAS Observations of Water in Molecular Outflows
Bergin, Edwin A.; Neufeld, David A.; Kaufman, Michael J. +4 more
We present detections of the ground-state 110→ 101 transition of ortho-H2O at 557 GHz in 18 molecular outflows based on data from the Submillimeter Wave Astronomy Satellite (SWAS). These results are combined with ground-based observations of the J = 1-0 transitions of 12CO and 13CO obtained at…
Forced obliquity and moments of inertia of Titan
Nimmo, Francis; Bills, Bruce G.
The obliquity of Titan is small, but certainly non-zero, and may be used to place constraints on Titan's internal structure. The measured gravity coefficients of Titan imply that it is non-hydrostatic and thus the normal Darwin-Radau approach to determining internal structure cannot be applied. However, if the obliquity is assumed to be tidally da…
A global hybrid model for Titan's interaction with the Kronian plasma: Application to the Cassini Ta flyby
Modolo, R.; Chanteur, G. M.
The interaction between the corotating magnetospheric plasma of Saturn and the exosphere of Titan is investigated by means of a three-dimensional and multispecies hybrid simulation model coupling charged and neutral species via three ionizing mechanisms: the absorption of extreme ultraviolet solar photons, the impacts of magnetospheric electrons, …
Adaptive optics imaging and optical spectroscopy of a multiple merger in a luminous infrared galaxy
Östlin, G.; Farrah, D.; Kniazev, A. +16 more
We present near-infrared (NIR) adaptive optics imaging obtained with VLT/NACO and optical spectroscopy from the Southern African Large Telescope of a luminous IR galaxy (LIRG) IRAS 19115-2124. These data are combined with archival Hubble Space Telescope imaging and Spitzer imaging and spectroscopy, allowing us to study this disturbed interacting/m…
Molecular jets driven by high-mass protostars: a detailed study of the IRAS 20126+4104 jet
Eislöffel, J.; Nisini, B.; Giannini, T. +2 more
Context: Protostellar jets from intermediate- and high-mass protostars provide an excellent opportunity to understand the mechanisms responsible for intermediate- and high-mass star-formation. A crucial question is if they are scaled-up versions of their low-mass counterparts. Such high-mass jets are relatively rare and, usually, they are distant …
Titan's Tropical Storms in an Evolving Atmosphere
McKay, Christopher P.; Griffith, Caitlin A.; Ferri, Francesca
The Huygens probe landed in a damp lake bed fed by fluvial channels, indicative of past rainfall. Such washes, interspersed with vast dunes, are typical of Titan's tropical landscape. Yet, Cassini-Huygens measurements reveal a highly stable tropical atmosphere devoid of deep convective storms, and the formation of washes in dune fields is not unde…