Search Publications
Relative contributions of sublimation and volcanoes to Io's atmosphere inferred from its plasma interaction during solar eclipse
Saur, Joachim; Strobel, Darrell F.
We present a model that describes Io's delayed electrodynamic response to a temporal change in Io's atmosphere. Our model incorporates the relevant physical processes involved in Io's atmosphere-ionosphere-magnetosphere electrodynamic interaction to predict the far-ultraviolet (FUV) radiation as Io enters Jupiter's shadow and re-emerges into sunli…
Physical Conditions in the Narrow-Line Region of M51
Kaiser, M. E.; Bradley, L. D.; Baan, W. A.
We have investigated the physical conditions in the narrow-line region (NLR) of M51 by using long-slit spectra obtained with the Space Telescope Imaging Spectrograph aboard the Hubble Space Telescope and 3.6 cm radio continuum observations obtained with the Very Large Array.2 Emission-line diagnostics were employed for nine NLR clouds, which exten…
Abundances of Planetary Nebulae IC 418, IC 2165 and NGC 5882
Pottasch, S. R.; Beintema, D. A.; Feibelman, W. A. +1 more
The ISO and IUE spectra of the elliptical nebulae
Multisatellite measurements of electron phase space density gradients in the Earth's inner and outer magnetosphere
Balogh, A.; Daly, P. W.; Dunlop, M. W. +4 more
The variability of the intensity of energetic (MeV) electrons in the Earth's radiation belts has been a renewed area of interest in recent years, yet a major outstanding question is the origin of these particles. In the current study we attempt to differentiate between local stochastic heating and radial diffusion or transport by investigating whe…
On the Nature of the LBV/WR Eclipsing Binary System HD 5980
Koenigsberger, G.
HD 5980 is a multiple star system in the Small Magellanic Cloud that underwent a luminous blue variable-like eruption in 1993-1994. The erupting star (star A) forms part of a close eclipsing binary whose companion's (star B) Wolf-Rayet nature has recently been questioned. The data analyzed in this paper cover the period 1979-2002, and support the …
Late evolution of the X-ray afterglow of GRB 030329
Ghirlanda, G.; Ghisellini, G.; Tiengo, A. +2 more
The X-ray afterglow of the Gamma-Ray Burst GRB 030329, associated with SN2003dh at z= 0.1685, has been observed with XMM-Newton 258 days after the burst explosion. A source with a flux of (6.2 ± 2.3) × 10-16 erg cm-2 s-1 (0.5-2 keV) has been detected at the GRB position. This measurement, together with a re-analysi…
Molecular and ionized gas in the tidal tail in Stephan's Quintet
Duc, P. -A.; Braine, J.; Charmandaris, V. +3 more
We have mapped with the IRAM interferometer at Plateau de Bure (PdBI) the 12CO emission towards intergalactic star forming regions located in the tidal tail stemming from NGC 7319, in the Stephan's Quintet compact group of galaxies. The 13CO emission of the same region was observed with the IRAM 30 m telescope and optical spe…
Reconsidering the Origin of the 21 Micron Feature: Oxides in Carbon-rich Protoplanetary Nebulae?
Mutschke, H.; Posch, Th.; Andersen, A.
The origin of the so-called 21 µm feature that is especially prominent in the spectra of some carbon-rich protoplanetary nebulae (PPNs) is the matter of a lively debate. A large number of potential band carriers have been presented and discarded within the past decade. This paper gives an overview of the problems related to the hitherto prop…
Markarian 1239: A Highly Polarized Narrow-Line Seyfert 1 Galaxy with a Steep X-Ray Spectrum and Strong Ne IX Emission
Komossa, S.; Grupe, D.; Mathur, S.
We report the results of an XMM-Newton observation of the narrow-line Seyfert 1 galaxy Mrk 1239. This optically highly polarized AGN has one of the steepest X-ray spectra found in AGNs, with αX=+3.0 based on ROSAT PSPC data. The XMM-Newton EPIC pn and MOS data confirm this steep X-ray spectrum. The pn data are best fitted by a power law…
Jovian auroral spectroscopy with FUSE: analysis of self-absorption and implications for electron precipitation
Feldman, P. D.; Moos, H. W.; Roueff, E. +12 more
High-resolution ( ∼0.22 Å) spectra of the north jovian aurora were obtained in the 905-1180 Å window with the Far Ultraviolet Spectroscopic Explorer (FUSE) on October 28, 2000. The FUSE instrument resolves the rotational structure of the H 2 spectra and the spectral range allows the study of self-absorption. Below 1100 Å, transitions co…