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
26 papers · 1 filter
The Spectral Energy Distribution of Fermi bright blazars
A. A. Abdo, M. Ackermann, M. Ajello +107
(Abridged) We have conducted a detailed investigation of the broad-band spectral properties of the γ-ray selected blazars of the Fermi LAT Bright AGN Sample (LBAS). By combining ou…
Probing Shock Properties with Non-thermal X-ray Filaments in Cas A
Miguel Araya, David Lomiashvili, Chulhoon Chang +2
Thin non-thermal X-ray filaments are often seen in young supernova remnants. We used data from the 1 Ms Chandra observation of Cassiopeia A to study spectral properties of some of…
Magnetic Rossby waves in the solar tachocline and Rieger-type periodicities
T. V. Zaqarashvili, M. Carbonell, R. Oliver +1
Apart from the 11-year solar cycle, another periodicity around 155-160 days was discovered during solar cycle 21 in high energy solar flares, and its presence in sunspot areas and…
Mass Varying Neutrinos, Quintessence, and the Accelerating Expansion of the Universe
G. Y. Chitov, T. August, A. Natarajan +1
We analyze the Mass Varying Neutrino (MaVaN) scenario. We consider a minimal model of massless Dirac fermions coupled to a scalar field, mainly in the framework of finite temperatu…
Simultaneous multi-frequency observation of the unknown redshift blazar PG 1553+113 in March-April 2008
MAGIC Collaboration, J. Aleksić, H. Anderhub +161
The blazar PG 1553+113 is a well known TeV gamma-ray emitter. In this paper, we determine its spectral energy distribution using simultaneous multi-frequency data in order to study…
Multiwavelength observations of a TeV-Flare from W Comae
VERITAS collaboration, V. A. Acciari, E. Aliu +167
We report results from an intensive multiwavelength campaign on the intermediate-frequency-peaked BL Lacertae object W Com (z=0.102) during a strong outburst of very high energy ga…
Results of UBV Photoelectric Observations of the Early-Type Eclipsing Binary System XZ Cep
M. I. Kumsiashvili, K. B. Chargeishvili, E. B. Janiashvili
Results of the three-colour photoelectric observation of the close binary system XZ Cep, obtained at the Abastumani Astrophysical observatory, are presented.
AGILE detection of a rapid gamma-ray flare from the blazar PKS 1510-089 during the GASP-WEBT monitoring
F. D'Ammando, G. Pucella, C. M. Raiteri +103
We report the detection by the AGILE satellite of a rapid gamma-ray flare from the powerful gamma-ray quasar PKS 1510-089, during a pointing centered on the Galactic Center region…
Linear coupling of modes in 2D radially stratified astrophysical discs
A. G. Tevzadze, G. D. Chagelishvili, G. Bodo +1
We investigate mode coupling in a two dimensional compressible disc with radial stratification and differential rotation. We employ the global radial scaling of linear perturbation…
The GASP-WEBT monitoring of 3C 454.3 during the 2008 optical-to-radio and gamma-ray outburst
M. Villata, C. M. Raiteri, M. A. Gurwell +6
Since 2001, the radio quasar 3C 454.3 has undergone a period of high optical activity, culminating in the brightest optical state ever observed, during the 2004-2005 outburst. The…
On the very high energy (>25GeV) pulsed emission in the Crab pulsar
Machabeli George, Osmanov Zaza
We have examined the recently detected very high energy (VHE) pulsed radiation from the Crab pulsar. According to the observational evidence, the observed emission (>25GeV) peaks a…
Weak and strong regimes of incompressible magnetohydrodynamic turbulence
G. Gogoberidze, S. M. Mahajan, S. Poedts
It is shown that in the framework of the weak turbulence theory, the autocorrelation and cascade timescales are always of the same order of magnitude. This means that, contrary to…
Phase Transition Generated Cosmological Magnetic Field at Large Scales
Tina Kahniashvili, Alexander G. Tevzadze, Bharat Ratra
We constrain a primordial magnetic field (PMF) generated during a phase transition (PT) using the big bang nucleosynthesis bound on the relativistic energy density. The amplitude o…
Investigation of Non-Stable Processes in Close Binary Ry Scuti
M. I. Kumsiashvili, R. Sh. Natsvllshvili, K. B. Chargeishvili
We present results of reanalysis of old electrophotometric data of early type close binary system RY Scuti obtained at the Abastumani Astrophysical Observatory, Georgia, during 197…
Oscillations and waves in solar spicules
T. V. Zaqarashvili, R. Erdelyi
Since their discovery, spicules have attracted increased attention as energy/mass bridges between the dense and dynamic photosphere and the tenuous hot solar corona. Mechanical ene…
Constraints on dark energy from the lookback time versus redshift test
Lado Samushia, Abha Dev, Deepak Jain +1
We use lookback time versus redshift data from galaxy clusters (Capozziello et al., 2004) and passively evolving galaxies (Simon et al., 2005), and apply a bayesian prior on the to…
On particle acceleration and very high energy gamma-ray emission in Crab-like pulsars
Zaza Osmanov, Frank M. Rieger
The origin of very energetic charged particles and the production of very high-energy (VHE) gamma-ray emission remains still a challenging issue in modern pulsar physics. By applyi…
Acoustic oscillations in the field-free, gravitationally stratified Acoustic oscillations in the field-free, gravitationally stratified cavities under solar bipolar magnetic canopies
D. Kuridze, T. V. Zaqarashvili, B. M. Shergelashvili +1
The main goal is to study the dynamics of the gravitationally stratified, field-free cavities in the solar atmosphere, located under small-scale, cylindrical magnetic canopies, in…
The correlated optical and radio variability of BL Lacertae. WEBT data analysis 1994-2005
M. Villata, C. M. Raiteri, V. M. Larionov +2
Since 1997, BL Lacertae has undergone a phase of high optical activity, with the occurrence of several prominent outbursts. Starting from 1999, the Whole Earth Blazar Telescope (WE…
Constraining dark energy with gamma-ray bursts
Lado Samushia, Bharat Ratra
We use the measurement of gamma-ray burst (GRB) distances to constrain dark energy cosmological model parameters. We employ two methods for analyzing GRB data - fitting luminosity…
Gravitational Radiation Generated by Cosmological Phase Transition Magnetic Fields
Tina Kahniashvili, Leonard Kisslinger, Trevor Stevens
We study gravitational waves generated by the cosmological magnetic fields induced via bubble collisions during the electroweak (EW) and QCD phase transitions. The magnetic field g…
Network Loop Oscillations with EIS/Hinode
A. K. Srivastava, D. Kuridze, T. V. Zaqarashvili +2
We analyze a time sequence of He II 256.32 angstrom images obtained with EIS/Hinode, sampling a small magnetic loop in magnetic network. Wavelet analysis indicates 11-min periodici…
Farley-Buneman Instability in the Solar Chromosphere
G. Gogoberidze, Y. Voitenko, S. Poedts +1
The Farley-Buneman instability is studied in the partially ionized plasma of the solar chromosphere taking into account the finite magnetization of the ions and Coulomb collisions.…
Multiwavelength Observations of Markarian 421 in 2005 - 2006
D. Horan, V. A. Acciari, S. M. Bradbury +71
Since September 2005, the Whipple 10m Gamma-ray Telescope has been operated primarily as a blazar monitor. The five Northern Hemisphere blazars that have already been detected at t…