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Far-ultraviolet Spectroscopy of Old Novae. I. V603 Aquila
Sion, Edward M.; Godon, Patrick; Bisol, Alexandra
We present the results of a synthetic spectral analysis of the far-ultraviolet archival International Ultraviolet Explorer, Hubble Space Telescope (HST), and FUSE observations of the fast old nova V603 Aql, obtained some 90 years after its 1918 nova outburst. Our analysis utilizes the new Hubble fine guidance sensor parallax distance for this near…
Application of Mutual Information Methods in Time-Distance Helioseismology
Pevtsov, Alexei A.; Kholikov, Shukur; Keys, Dustin
We apply a new technique, the mutual information (MI) from information theory, to time-distance helioseismology, and demonstrate that it can successfully reproduce several classic results based on the widely used cross-covariance method. MI quantifies the deviation of two random variables from complete independence and represents a more general me…
Series anomalies of low multipoles of WMAP and Planck missions: What are they?
Verkhodanov, O. V.
We consider the main anomalies of cosmic microwave background observed at low multipoles of the WMAP and Planck cosmic missions. The possible origin of these features is discussed. We study difference between WMAP and Planck data which is apparently connected with the local sources emission and/or systematics.
Historic Rosetta mission to end with crash into comet
Gibney, Elizabeth
There were other options, but super close-up shots on descent will provide science bonanza.
On the origin of the Fe Kα emission line from intermediate polar EX Hyrae
Eze, R. N. C.; Esaenwi, S.
We present spectral analysis of intermediate polar EX Hya observed with Suzaku satellite on 18-07-2007 for 91 kilo seconds (ks). We model the spectrum with an absorbed thermal bremsstrahlung and three Gaussian lines for the Fe Kα line complex. We resolved the 6.4, 6.7, and 7.0 keV lines, each corresponding to the neutral (or low-ionized), He-like,…
Dust in BL Lac objects and Fanaroff-Riley radio galaxies: infrared region
Seal Braun, P.
Here 28 BL Lac objects, 18 FR I type radio galaxies, 4 FR I/II type radio galaxies and 10 FR II type radio galaxies are studied from FIR (far infrared) to optical region (180 µm to 0.44 µm) to understand the nature of infrared emission from these objects and the physical properties of dust in the emitting region. Using the flux densiti…
Whistlers observed outside the plasmasphere: Correlation to plasmaspheric/plasmapause features
Gallagher, D. L.; Adrian, M. L.; Fung, S. F. +1 more
Whistlers observed outside the plasmasphere by Cluster have been correlated with the global plasmasphere using Imager for Magnetopause-to-Aurora Global Exploration-Extreme Ultraviolet Imager (IMAGE-EUV) observations. Of the 12 Cluster-observed whistler events reported, EUV is able to provide global imaging of the plasmasphere for every event and d…
Silicates on Iapetus from Cassini’s Composite Infrared Spectrometer
Clark, Roger N.; Spencer, John R.; Wray, James J. +5 more
We present the first spectral features obtained from Cassini’s Composite Infrared Spectrometer (CIRS) for any icy moon. The spectral region covered by CIRS focal planes (FP) 3 and 4 is rich in emissivity features, but previous studies at these wavelengths have been limited by low signal-to-noise ratios (S/Ns) for individual spectra. Our approach i…
QPO and LFN in the power spectrum of rapid variability for the X-ray nova SWIFT J174510.8-262411
Grebenev, S. A.; Prosvetov, A. V.
Results of the study of the X-ray nova SWIFT J174510.8-262411 by the INTEGRAL, SWIFT, and VLA observatories in September-October 2012 at the early outburst phase are presented. Attention is focused on analyzing the power spectrum of X-ray flux fluctuations of the source in which a powerful quasi-periodic oscillation (QPO) peak has been detected. T…
Emergence of hard X-rays at weak nonstationary processes in active regions
Livshits, M. A.; Grigor'eva, I. Yu.; Ivanov, E. F. +1 more
Using Suzaku and Reuven Ramaty High Energy Solar Spectroscopic Image (RHESSI) spacecraft data, we study the characteristics of X-ray emission of weak flares at energies when this emission is generated by fluxes of accelerated electrons. Of the 105 events recorded by a broadband monitor of the entire sky (WAM/Suzaku, with an effective area of ~800 …