Search Publications
Modeling X-Ray Emission of a Straight Jet:. PKS 0920-397
Siemiginowska, A.; Birkinshaw, M.; Worrall, D. M. +14 more
We summarize a study of PKS 0920-397 using our 42 ks Chandra observation in conjunction with our ATCA 20GHz image, and HST/ACS F814W and F475W images. We investigate the hypothesis that the jet X-ray emission is due to inverse-Compton (IC) scattering on the cosmic microwave background (CMB) from the same population of relativistic electrons that g…
The acoustic and magnetic solar cycle
Komm, R.
The frequency variation of global modes provides information about the solar structure and the rotation rate of the solar interior. The solar-cycle variation of the rotation rate, the so-called torsional oscillation, extends throughout the convection zone. Alternating bands of faster- and slower-than-average rotation move from mid-latitudes toward…
A Simple Model for Radioisotope Power System Performance in the Titan Environment
Lorenz, R. D.
Like other energy conversion devices, the performance of Radioisotope Power Systems (RPSs) for spacecraft depend on the heat transfer boundary conditions. In planetary environments, the heat transfer, and thus the RPS operating conditions and performance may be different from those in free space. In particular, we develop a simple model (based on …
On a Method to Resolve the Nuclear Activity in Galaxies as Applied to the Seyfert 2 Galaxy NGC 1358
Fathi, Kambiz; Nelson, Charles H.; Lindblad, Per Olof +1 more
Nuclear regions of galaxies generally host a mixture of components with different excitations, compositions, and kinematics. Derivation of emission line ratios and kinematics could then be misleading if due correction is not made for the limited spatial and spectral resolutions of the observations. The aim of this paper is to demonstrate, with app…
Compressive turbulent cascade and heating in the solar wind
Bruno, R.; Carbone, V.; Sorriso-Valvo, L. +2 more
A turbulent energy cascade has been recently identified in high-latitude solar wind data samples by using a Yaglom-like relation. However, analogous scaling law, suitably modified to take into account compressible fluctuations, has been observed in a much more extended fraction of the same data set recorded by the Ulysses spacecraft. Thus, it seem…
CME Classification Based on Wavelet Spectra
Raga, A. C.; Blanco-Cano, X.; González-Gómez, D. I.
We study the internal structure of coronal mass ejections (CMEs) using wavelet analysis. We derive wavelet spectra, spatially integrated over regions of interest within LASCO C2 white-light coronographic images. These spectra show an inflection point, which we use to characterize each spectrum. In a diagram of flux vs. spatial scale of the inflect…
The secondary eclipse of the transiting exoplanet CoRoT-2b (Corrigendum)
Mazeh, T.; Aigrain, S.; Alapini, A. +5 more
Based on observations obtained with CoRoT, a space project operated by the French Space Agency, CNES, with participation of the Science Programme of ESA, ESTEC/RSSD, Austria, Belgium, Brazil, Germany and Spain.
QSAS, QM Science Analysis Software
Allen, A. J.
QSAS is a powerful tool for manipulating, combining and displaying multi-spacecraft and multi-instrument data. It uses the CAA metadata to its fullest potential to allow efficient handling of units and reference frames. It can also save and restore calculations and plot designs for reuse on different data intervals.
Latitudinal and Solar-Cycle Variations of the White-Light Corona from SOHO/LASCO Observations
Fainshtein, V. G.; Kashapova, L. K.; Tsivileva, D. M.
SOHO/LASCO data were used to obtain the latitudinal and radial distributions of the brightness of the K- and F-corona in the period of 1996 - 2007, and their solar-cycle variations were studied. Then an inversion method was employed to obtain the radial distributions of the electron density Ne(R,θ) for various latitude values on the cor…
Deep near-infrared imaging of the HE0450-2958 system
Magain, P.; Letawe, G.
Context. The QSO HE0450-2958 and the companion galaxy with which it is interacting, both ultra luminous in the infrared, have been the subject of much attention in recent years, as the quasar host galaxy remained undetected. This led to various interpretations on QSO and galaxy formation and co-evolution, such as black hole ejection, jet induced s…