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
24 papers · 1 filter
A Detection of the Baryon Acoustic Oscillation Features in the SDSS BOSS DR12 Galaxy Bispectrum
David W. Pearson, Lado Samushia
We present the first high significance detection () of the Baryon Acoustic Oscillations (BAO) feature in the galaxy bispectrum of the twelfth data release (DR12) of the Baryo…
Blazar spectral variability as explained by a twisting inhomogeneous jet
C. M. Raiteri, M. Villata
Blazar emission is dominated by non-thermal radiation from a relativistic jet pointing toward us, therefore undergoing Doppler beaming. This is responsible for flux enhancement and…
YORP and Yarkovsky effects in asteroids (1685) Toro, (2100) Ra-Shalom, (3103) Eger, and (161989) Cacus
J. Durech, D. Vokrouhlicky, P. Pravec +22
The rotation states of small asteroids are affected by a net torque arising from an anisotropic sunlight reflection and thermal radiation from the asteroids' surfaces. On long time…
Evolution of hydromagnetic turbulence from the electroweak phase transition
Axel Brandenburg, Tina Kahniashvili, Sayan Mandal +3
We present new simulations of decaying hydromagnetic turbulence for a relativistic equation of state relevant to the early universe. We compare helical and nonhelical cases either…
The observational constraints on the flat CDM models
Olga Avsajanishvili, Yiwen Huang, Lado Samushia +1
Most dark energy models have the CDM as their limit, and if future observations constrain our universe to be close to CDM Bayesian arguments about the evidence and the fine-t…
The dynamo effect in decaying helical turbulence
Axel Brandenburg, Tina Kahniashvili, Sayan Mandal +3
We show that in decaying hydromagnetic turbulence with initial kinetic helicity, a weak magnetic field eventually becomes fully helical. The sign of magnetic helicity is opposite t…
Multi-wavelength temporal and spectral variability of the blazar OJ 287 during and after the December 2015 flare: a major accretion disc contribution
P. Kushwaha, A. C. Gupta, P. J. Wiita +33
We present a multi-wavelength spectral and temporal analysis of the blazar OJ 287 during its recent activity between December 2015 -- May 2016, showing strong variability in the ne…
Dissecting the long-term emission behaviour of the BL Lac object Mrk 421
M. I. Carnerero, C. M. Raiteri, M. Villata +4
We report on long-term multi-wavelength monitoring of blazar Mrk 421 by the GASP-WEBT collaboration and Steward Observatory, and by the Swift and Fermi satellites. We study the sou…
Structure of the solar photosphere studied from the radiation hydrodynamics code ANTARES
P. Leitner, B. Lemmerer, A. Hanslmeier +4
The ANTARES radiation hydrodynamics code is capable of simulating the solar granulation in detail unequaled by direct observation. We introduce a state-of-the-art numerical tool to…
The turbulent chiral-magnetic cascade in the early universe
Axel Brandenburg, Jennifer Schober, Igor Rogachevskii +5
The presence of asymmetry between fermions of opposite handedness in plasmas of relativistic particles can lead to exponential growth of a helical magnetic field via a small-scale…
Meterwavelength Single-pulse Polarimetric Emission Survey III: The Phenomenon of Nulling in Pulsars
Rahul Basu, Dipanjan Mitra, George I. Melikidze
A detailed analysis of nulling was conducted for the pulsars studied in the Meterwavelength Single-pulse Polarimetric Emission Survey. We characterized nulling in 36 pulsars includ…
Quasi-two-dimensional nonlinear evolution of helical magnetorotational instability in a magnetized Taylor-Couette flow
G. Mamatsashvili, F. Stefani, A. Guseva +1
Magnetorotational instability (MRI) is one of the fundamental processes in astrophysics, driving angular momentum transport and mass accretion in a wide variety of cosmic objects.…
Spectroscopic inversions of the Ca ii 8542 Å line in a C-class solar flare
D. Kuridze, V. Henriques, M. Mathioudakis +5
We study the C8.4 class solar flare SOL2016-05-14T11:34 UT using high-resolution spectral imaging in the Ca ii 8542 Å line obtained with the CRISP imaging spectropolarimeter on the…
North-south asymmetry in Rieger-type periodicity during solar cycles 19-23
Eka Gurgenashvili, Teimuraz V. Zaqarashvili, Vasil Kukhianidze +4
Rieger-type periodicity has been detected in different activity indices over many solar cycles. It was recently shown that the periodicity correlates with solar activity having a s…
Partially Ionized Plasmas in Astrophysics
Jose Luis Ballester, Igor Alexeev, Manuel Collados +9
Partially ionized plasmas are found across the Universe in many different astrophysical environments. They constitute an essential ingredient of the solar atmosphere, molecular clo…
Nonlinear transverse cascade and sustenance of MRI-turbulence in Keplerian disks with an azimuthal magnetic field
D. Gogichaishvili, G. Mamatsashvili, W. Horton +2
We investigate magnetohydrodynamic turbulence driven by the magnetorotational instability (MRI) in Keplerian disks with a nonzero net azimuthal magnetic field using shearing box si…
Statistical properties of coronal hole rotation rates: Are they linked to the solar interior?
Salome R. Bagashvili, Bidzina M. Shergelashvili, Darejan R. Japaridze +8
The present paper discusses results of a statistical study of the characteristics of coronal hole (CH) rotation in order to find connections to the internal rotation of the Sun. Th…
Kelvin--Helmholtz instability in a twisting solar polar coronal hole jet observed by \emph{SDO}/AIA
I. Zhelyazkov, T. V. Zaqarashvili, L. Ofman +1
We investigate the conditions under which the fluting (), , and magnetohydrodynamic (MHD) modes in a uniformly twisted flux tube moving along its axis become…
Dynamics of homogeneous shear turbulence: A key role of the nonlinear transverse cascade in the bypass concept
G. Mamatsashvili, G. Khujadze, G. Chagelishvili +3
To understand the self-sustenance of subcritical turbulence in spectrally stable shear flows, we performed direct numerical simulations of homogeneous shear turbulence for differen…
Radio and optical intra-day variability observations of five blazars
X. Liu, P. P. Yang, J. Liu +23
We carried out a pilot campaign of radio and optical band intra-day variability (IDV) observations of five blazars (3C66A, S5 0716+714, OJ287, B0925+504, and BL Lacertae) on Decemb…
Oscillation of solar radio emission at coronal acoustic cut-off frequency
O. S. Pylaev, T. V. Zaqarashvili, A. I. Brazhenko +3
Recent SECCHI COR2 observations on board STEREO-A spacecraft have detected density structures at a distance of 2.5--15~R propagating with periodicity of about 90~minutes. The obser…
The Variability and Period Analysis for the BL Lac AO 0235+164
J. H. Fan, O. Kurtanidze, Y. Liu +12
Variability is one of the extreme observational properties of BL Lacertae objects. AO 0235+164 is a well studied BL Lac through the whole electro-magnetic wavebands. In the present…
Visco-rotational shear instability of Keplerian granular flows
Luka G. Poniatowski, Alexander G. Tevzadze
The linear stability of viscous Keplerian flow around a gravitating center is studied using the rheological granular fluid model. The linear rheological instability triggered by th…
XMM-Newton observation of the nearby pulsar B1133+16
Andrzej Szary, Janusz Gil, Bing Zhang +5
We constrain the X-ray properties of the nearby , old () pulsar B1133+16 with effective exposure time by {\it XMM-Newton}. The o…