Search Publications
Corrigendum to “Titan’s surface and atmosphere from Cassini/VIMS data with updated methane opacity” [Icarus 226 (2013) 470-486]
Le Mouélic, S.; Rodriguez, S.; Lellouch, E. +13 more
Nonthermal emission model of isolated X-ray pulsar RX J0420.0-5022
Chkheidze, N.; Babyk, Iu.
In this paper, an alternative theoretical interpretation to the generally assumed thermal emission models of the observed X-ray spectrum of isolated pulsar RX J0420.0-5022 is presented. It is well-known that at a pulsar surface, the distribution function of relativistic particles is one-dimensional. However, cyclotron instability causes an appeara…
Spectra of X-ray galaxies in filaments
Tugay, A. V.
Large-scale structure of Universe consists of galaxy clusters connected by filaments. Single filaments can be detected at redshifts up to 0.15. The general characteriscis of X-ray spectra of Sloan Digital Sky Survey galaxies, that lies outside clusters, are considered in this work. Seyfert 1 AGN's are the main type of X-ray sources in the selected…
The Relationship between Extreme Ultraviolet Non-thermal Line Broadening and High-energy Particles during Solar Flares
Imada, S.; Kawate, T.
We have studied the relationship between the location of EUV non-thermal broadening and high-energy particles during large flares using the EUV Imaging Spectrometer on board Hinode, the Nobeyama Radio Polarimeter, the Nobeyama Radioheliograph, and the Atmospheric Imaging Assembly on board the Solar Dynamic Observatory. We have analyzed five large …
Low-energy 3He and 4He ions in interplanetary space during quiet periods of the 23rd solar cycle
Kecskeméty, K.; Logachev, Yu. I.; Surova, G. M. +1 more
Data from the ULEIS instrument aboard the ACE spacecraft are used to study the energy spectra of 3He and 4He ions produced during periods of the quiet Sun in the 23rd solar cycle in the energy range ∼0.08-2 MeV/nucleon. Differences in the spectra and 3He/4He relative abundances for three groups of quiet …
Nonlinear interaction of proton whistler with kinetic Alfvén wave to study solar wind turbulence
Goldstein, M. L.; Sharma, R. P.; Dwivedi, N. K. +1 more
This paper presents the nonlinear interaction between small but finite amplitude kinetic Alfvén wave (KAW) and proton whistler wave using two-fluid model in intermediate beta plasma, applicable to solar wind. The nonlinearity is introduced by modification in the background density. This change in density is attributed to the nonlinear ponderomotiv…
Pulsation of IU Per from the Ground-based and `Integral' Photometry
Gális, R.; Kundra, E.; Hric, L.
IU Per is an eclipsing semi-detached binary with a pulsating component. Using our own ground-based, as well as INTEGRAL satellite photometric observations in the B and V passbands, we derived geometrical and physical parameters of this system. We detected the short-term variations of IU Per in the residuals of brightness after the subtraction of s…
Radio observations of Planck clusters
Kale, R.
Recently, a number of new galaxy clusters have been detected by the ESA-Planck satellite, the South Pole Telescope, and the Atacama Cosmology Telescope using the Sunyaev-Zel'dovich effect. Several of the newly detected clusters are massive, merging systems with disturbed morphology in the X-ray surface brightness. Diffuse radio sources in clusters…
Determining distances using asteroseismic methods
Serenelli, A. M.; Chaplin, W. J.; Miglio, A. +5 more
Asteroseismology has been extremely successful in determining the properties of stars in different evolutionary stages with a remarkable level of precision. However, to fully exploit its potential, robust methods for estimating stellar parameters are required and independent verification of the results is needed. In this talk, I present a new tech…
Old stellar subsystems in dwarf galaxies
Tikhonov, N. A.
Based on archival Hubble Space Telescope ACS/WFC images, we have performed stellar photometry for eight dwarf galaxies of different types (Irr, S0, E) with a populated horizontal branch on their Hertzsprung-Russell diagrams. We have identified probable RR Lyr stars in these galaxies and constructed the distribution of their number density along th…