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
18 papers · 1 filter
Insights Into the High-Energy Gamma-ray Emission of Markarian 501 from Extensive Multifrequency Observations in the Fermi Era
LAT collaboration, A. A. Abdo et al., the MAGIC collaboration +6
We report on the gamma-ray activity of the blazar Mrk 501 during the first 480 days of Fermi operation. We find that the average LAT gamma-ray spectrum of Mrk 501 can be well descr…
Quasi-biennial oscillations in the solar tachocline caused by magnetic Rossby wave instabilities
T. V. Zaqarashvili, M. carbonell, R. Oliver +1
Quasi-biennial oscillations (QBO) are frequently observed in the solar activity indices. However, no clear physical mechanism for the observed variations has been suggested so far.…
Multi-wavelength Observations of the Flaring Gamma-ray Blazar 3C 66A in 2008 October
LAT collaboration, A. A. Abdo et al., the VERITAS collaboration +4
The BL Lacertae object 3C 66A was detected in a flaring state by the Fermi Large Area Telescope (LAT) and VERITAS in 2008 October. In addition to these gamma-ray observations, F-GA…
Primordial magnetic field limits from cosmological data
Tina Kahniashvili, Alexander G. Tevzadze, Shiv K. Sethi +2
We study limits on a primordial magnetic field arising from cosmological data, including that from big bang nucleosynthesis, cosmic microwave background polarization plane Faraday…
Designing a space-based galaxy redshift survey to probe dark energy
Yun Wang, Will Percival, Andrea Cimatti +13
A space-based galaxy redshift survey would have enormous power in constraining dark energy and testing general relativity, provided that its parameters are suitably optimized. We s…
Fermi Large Area Telescope and multi-wavelength observations of the flaring activity of PKS 1510-089 between 2008 September and 2009 June
LAT Collaboration
We report on the multi-wavelength observations of PKS 1510-089 (a flat spectrum radio quasar at z=0.361) during its high activity period between 2008 September and 2009 June. Durin…
Simulating Redshift-Space Distortions for Galaxy Pairs with Wide Angular Separation
Alvise Raccanelli, Lado Samushia, Will J. Percival
The analysis of Redshift-Space Distortions (RSD) within galaxy surveys provides constraints on the amplitude of peculiar velocities induced by structure growth, thereby allowing te…
Effects of cosmological model assumptions on galaxy redshift survey measurements
Lado Samushia, Will J. Percival, Luigi Guzzo +8
The clustering of galaxies observed in future redshift surveys will provide a wealth of cosmological information. Matching the signal at different redshifts constrains the dark ene…
Numerical simulations of spicule formation in the solar atmosphere
K. Murawski, T. V. Zaqarashvili
We study the upward propagation of a localized velocity pulse that is initially launched below the transition region within the solar atmosphere. The pulse quickly steepens into a…
Numerical simulations of the decay of primordial magnetic turbulence
Tina Kahniashvili, Axel Brandenburg, Alexander G. Tevzadze +1
We perform direct numerical simulations of forced and freely decaying 3D magnetohydrodynamic turbulence in order to model magnetic field evolution during cosmological phase transit…
A change in the optical polarization associated with a gamma-ray flare in the blazar 3C 279
LAT Collaboration, members of the 3C 279 multi-band campaign
It is widely accepted that strong and variable radiation detected over all accessible energy bands in a number of active galaxies arises from a relativistic, Doppler-boosted jet po…
Axisymmetric modes in vertically stratified self-gravitating discs
G. R. Mamatsashvili, W. K. M. Rice
We perform linear analysis of axisymmetric vertical normal modes in stratified compressible self-gravitating polytropic discs in the shearing box approximation. We study specific d…
Observation of kink instability during small B5.0 solar flare on 04 June, 2007
A. K. Srivastava, T. V. Zaqarashvili, Pankaj Kumar +1
Using multi-wavelength observations of SoHO/MDI, SOT-Hinode/blue-continuum (4504 Å), G-band (4305 Å), Ca II H (3968 Å) and TRACE 171 Å, we present the observational signature of hi…
Propagation of sausage soliton in the solar lower atmosphere observed by Hinode/SOT
T. V. Zaqarashvili, V. Kukhianidze, M. L. Khodachenko
Acoustic waves and pulses propagating from the solar photosphere upwards may quickly develop into shocks due to the rapid decrease of atmospheric density. However, if they propagat…
Will Multiple Probes of Dark Energy find Modified Gravity?
Charles Shapiro, Scott Dodelson, Ben Hoyle +2
One of the most pressing issues in cosmology is whether general relativity (GR) plus a dark sector is the underlying physical theory or whether a modified gravity model is needed.…
Flaring Behavior of the Quasar 3C~454.3 across the Electromagnetic Spectrum
Svetlana G. Jorstad, Alan P. Marscher, Valeri M. Larionov +29
We analyze the behavior of the parsec-scale jet of the quasar 3C~454.3 during pronounced flaring activity in 2005-2008. Three major disturbances propagated down the jet along diffe…
Multiwavelength observations of 3C 454.3. III. Eighteen months of AGILE monitoring of the "Crazy Diamond"
S. Vercellone, F. D'Ammando, V. Vittorini +110
We report on 18 months of multiwavelength observations of the blazar 3C 454.3 (Crazy Diamond) carried out in July 2007-January 2009. We show the results of the AGILE campaigns whic…
Probing the Inner Jet of the Quasar PKS 1510-089 with Multi-waveband Monitoring during Strong Gamma-ray Activity
Alan P. Marscher, Svetlana G. Jorstad, Valeri M. Larionov +29
We present results from monitoring the multi-waveband flux, linear polarization, and parsec-scale structure of the quasar PKS 1510-089, concentrating on eight major gamma-ray flare…