Search Publications
The local contribution to the microwave background radiation
Pecker, Jean-Claude; Narlikar, Jayant V.; Ochsenbein, Francois +1 more
The observed microwave background radiation (MBR) is commonly interpreted as the relic of an early hot universe, and its observed features (spectrum and anisotropy) are explained in terms of properties of the early universe. Here we describe a complementary, even possibly alternative, interpretation of MBR, first proposed in the early 20th
Counter data of the Cosmic Dust Analyzer aboard the Cassini spacecraft and possible “dust clouds” at Saturn
Grün, Eberhard; Srama, Ralf; Khalisi, Emil
We present the impact rates of dust particles recorded by the Cosmic Dust Analyzer (CDA) aboard the Cassini spacecraft. The “dust counters” evaluate the quality of an impact and give rise to the apparent density of dust particles in space.
The raw data is pre-selected and refined to a new structure that serves to a better investigation of den…Pitch-angle diffusion of electrons through growing and propagating along a magnetic field electromagnetic wave in Earth's radiation belts
Park, Y. -D.; Dokgo, K.; Lee, D. -Y. +5 more
The diffusion of electrons via a linearly polarized, growing electromagnetic (EM) wave propagating along a uniform magnetic field is investigated. The diffusion of electrons that interact with the growing EM wave is investigated through the autocorrelation function of the parallel electron acceleration in several tens of electron gyration timescal…
The subsurface of Pluto from submillimetre observations.
Bendo, G. J.; Greaves, J. S.; Whitelaw, A. C. M.
Surface areas on Pluto change in brightness and colour, at optical to infrared wavelengths, over time-scales as short as years. The subsurface contains a reservoir of frozen volatiles, but little is known about it because Pluto is out of reach for cm-radar. Here we present a 0.85 mm wavelength light curve of the Pluto system, from archival data ta…
Predicted multiply imaged X-ray AGNs in the XXL survey
Surdej, J.; Horellou, C.; Melnyk, O. +3 more
We estimate the incidence of multiply imaged active galactic nuclei (AGNs) among the optical counterparts of X-ray selected point-like sources in the XXL field. We also derive the expected statistical properties of this sample, such as the redshift distribution of the lensed sources and of the deflectors that lead to the formation of multiple imag…
Catalogues of the Faint Objects in the Areas with Gamma-Ray Bursts
Andruk, V. M.; Pakuliak, L. K.; Golovnia, V. V. +5 more
The results of GRB observations are being published in the GCN Circulars in real-time. To study all the objects in the sky areas around the GRBs we identified them on the digitized MAO Double Wide angle Astrograph (DWA) plates (D/F=40/200) within a circle with the radius of dozens of arcminutes. We selected only GRBs with the positional accuracy b…
Probing f(R) gravity with PLANCK data on cluster pressure profiles
Atrio-Barandela, F.; De Martino, I.; De Laurentis, M. +1 more
Analytical f(R)-gravity models introduce Yukawa-like corrections to the Newtonian potential in the weak field limit. These models can explain the dynamics of galaxies and cluster of galaxies without requiring dark matter. To test the model, we have computed the pressure profile of 579 X-ray galaxy clusters assuming the gas is in hydrostatic equili…
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.