2.5k citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- Ilia State UniversityGE219 papers
- Instituto de Astrofísica de AndalucíaES90 papers
- Center for Astrophysics Harvard & SmithsonianUS82 papers
- Osservatorio Astrofisico di TorinoIT81 papers
- National Institute for AstrophysicsIT77 papers
- Boston UniversityUS72 papers
- Pulkovo ObservatoryRU71 papers
- Instituto de Astrofísica de CanariasES70 papers
- Space Research InstituteRU70 papers
- Centre National de la Recherche ScientifiqueFR69 papers
- Kansas State UniversityUS69 papers
- St Petersburg UniversityRU69 papers
22 papers · 1 filter
Fables of reconstruction: controlling bias in the dark energy equation of state
Robert G. Crittenden, Gong-Bo Zhao, Levon Pogosian +2
We develop an efficient, non-parametric Bayesian method for reconstructing the time evolution of the dark energy equation of state w(z) from observational data. Of particular impor…
Location of the Gamma-Ray Flaring Emission in the Parse-Scale Jet of the BL Lac Object AO 0235+164
Ivan Agudo, Alan P. Marscher, Svetlana G. Jorstad +12
We locate the gamma-ray and lower frequency emission in flares of the BL Lac object AO 0235+164 at >12pc in the jet of the source from the central engine. We employ time-dependent…
Determination of homogenized effective temperatures from stellar catalogs
Malyuto, Shvelidze
Some selected catalogs of the effective temperatures for F, G and K stars are analyzed. By an improved technique we estimate the external errors of these catalogs from data interco…
Frequency drifts of 3-min oscillations in microwave and EUV emission above sunspots
R. Sych, T. V. Zaqarashvili, V. M. Nakariakov +3
We analyse 3-min oscillations of microwave and EUV emission generated at different heights of a sunspot atmosphere, studying the amplitude and frequency modulation of the oscillati…
Galaxy cluster number count data constraints on cosmological parameters
L. Campanelli, G. L. Fogli, T. Kahniashvili +2
[Abridged] We use data on massive galaxy clusters ( within a comoving radius of $R_{\rm cluster} = 1.5 h^{-1}\Mpc$) in the redshi…
Damping of Alfven waves in solar partially ionized plasmas: effect of neutral helium in multi-fluid approach
T. V. Zaqarashvili, M. L. Khodachenko, H. O. Rucker
Chromospheric and prominence plasmas contain neutral atoms, which may change the plasma dynamics through collision with ions. Most of the atoms are neutral hydrogen, but a signific…
Spectrum evolution in binary pulsar B1259-63/LS 2883 Be star and gigahertz-peaked spectra
J. Kijak, M. Dembska, W. Lewandowski +2
We study the radio spectrum of PSR B1259-63 orbiting around the Be star LS 2883 and show that the shape of the spectrum depends on the orbital phase. At frequencies below 3 GHz PSR…
Numerical simulations of solar macrospicules
K. Murawski, Abhishek K. Srivastava, T. V. Zaqarashvili
Context. We consider a localized pulse in the component of velocity, parallel to the ambient magnetic field lines, that is initially launched in the solar chromosphere. Aims. We ai…
Stability of self-gravitating discs under irradiation
W. K. M. Rice, P. J. Armitage, G. R. Mamatsashvili +2
Self-gravity becomes competitive as an angular momentum transport process in accretion discs at large radii, where the temperature is low enough that external irradiation likely co…
Partially Screened Gap -- general approach and observational consequences
Andrzej Szary, George I. Melikidze, Janusz Gil
Observations of the thermal X-ray emission from radio pulsars implicate that the size of hot spots is much smaller then the size of the polar cap that follows from the purely dipol…
Rossby waves and polar spots in rapidly rotating stars: Implications for stellar wind evolution
T. V. Zaqarashvili, R. Oliver, J. L. Ballester +5
Rapidly rotating stars show short-period oscillations in magnetic activity and polar appearance of starspots. The aim of this paper is to study large-scale shallow water waves in t…
Identification of gamma-ray emission from 3C345 and NRAO512
F. K. Schinzel, K. V. Sokolovsky, F. D'Ammando +36
For more than 15 years, since the days of the Energetic Gamma-Ray Experiment Telescope (EGRET) on board the Compton Gamma-Ray Observatory (CGRO; 1991-2000), it has remained an open…
The long-lasting activity of 3C 454.3. GASP-WEBT and satellite observations in 2008-2010
C. M. Raiteri, M. Villata, M. F. Aller +6
We present multiwavelength observations of 3C 454.3 from April 2008 to March 2010. The radio to optical data are mostly from the GASP-WEBT, UV and X-ray data from Swift, and gamma-…
The brightest gamma-ray flaring blazar in the sky: AGILE and multi-wavelength observations of 3C 454.3 during November 2010
S. Vercellone, E. Striani, V. Vittorini +84
Since 2005, the blazar 3C 454.3 has shown remarkable flaring activity at all frequencies, and during the last four years it has exhibited more than one gamma-ray flare per year, be…
Excitation of spiral density waves by convection in accretion discs
G. R. Mamatsashvili, W. K. M. Rice
Motivated by the recent results of \citet{Lesur_Ogilvie10} on the transport properties of incompressible convection in protoplanetary discs, in this paper we study the role of comp…
Fermi-LAT Observations of Markarian 421: the Missing Piece of its Spectral Energy Distribution
LAT collaboration, A. A. Abdo et al., the MAGIC collaboration +4
We report on the gamma-ray activity of the high-synchrotron-peaked BL Lacertae object Mrk 421 during the first 1.5 years of Fermi operation, from 2008 August 5 to 2010 March 12. We…
On the Location of the Gamma-ray Emission in the 2008 Outburst in the BL Lacertae Object AO 0235+164 through Observations across the Electromagnetic Spectrum
Ivan Agudo, Alan P. Marscher, Svetlana G. Jorstad +38
We present observations of a major outburst at centimeter, millimeter, optical, X-ray, and gamma-ray wavelengths of the BL Lacertae object AO 0235+164. We analyze the timing of mul…
AGILE detection of extreme gamma-ray activity from the blazar PKS 1510-089 during March 2009. Multifrequency analysis
F. D'Ammando, C. M. Raiteri, M. Villata +112
We report on the extreme gamma-ray activity from the FSRQ PKS 1510-089 observed by AGILE in March 2009. In the same period a radio-to-optical monitoring of the source was provided…
Interpreting large-scale redshift-space distortion measurements
Lado Samushia, Will J. Percival, Alvise Raccanelli
The simplest theory describing large-scale redshift-space distortions (RSD), based on linear theory and distant galaxies, depends on the growth of cosmological structure, suggestin…
Magnetohydrodynamic waves in solar partially ionized plasmas: two-fluid approach
T. V. Zaqarashvili, M. K. Khodachenko, H. O. Rucker
We derive the dynamics of magnetohydrodynamic waves in two-fluid partially ionized plasmas and to compare the results with those obtained under single-fluid description. Two-fluid…
The excitation of 5-min oscillations in the solar corona
T. V. Zaqarashvili, K. Murawski, M. K. Khodachenko +1
We aim to study excitation of the observed 5-min oscillations in the solar corona by localized pulses that are launched in the photosphere. We solve the full set of nonlinear one-d…
Observation of Kink Instability as Driver of Recurrent Flares in AR 10960
A. K. Srivastava, Pankaj Kumar, T. V. Zaqarashvili +3
We study the active region NOAA 10960, which produces two flare events (B5.0, M8.9) on 04 June 2007. We find the observational signature of right handed helical twists in the loop…