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16 papers · 1 filter
Intermediate Scale Structures in BL Lac objects
C. Reynolds, T. V. Cawthorne, D. C. Gabuzda
The parsec-scale total intensity structures of BL Lac objects share many characteristics with quasars: e.g. well-collimated jets and superluminal motion. However, the jets of BL La…
Smooth projective planes
Benjamin McKay
Using symplectic topology and the Radon transform, we prove that smooth 4-dimensional projective planes are diffeomorphic to . We define the notion of a plane curve…
Delay Induced Excitability
Tomasz Piwonski, John Houlihan, Thomas Busch +1
We analyse the stochastic dynamics of a bistable system under the influence of time-delayed feedback. Assuming an asymmetric potential, we show the existence of a regime in which t…
Polarization and energy content of parsec scale AGN jets
Maxim Lyutikov, Vladimir I. Pariev, Denise C. Gabuzda
Most of energy carried by relativistic AGN jets remains undetected until hundreds of kiloparsecs where interaction with intergalactic medium produces hot spots. The jet's hidden en…
Time-resolved photometry of the nova remnants DM Gem, CP Lac, GI Mon, V400 Per, CT Ser and XX Tau
P. Rodriguez-Gil, M. A. P. Torres
We present the first results of a photometric survey of poorly studied nova remnants in the Northern Hemisphere. The main results are as follows: DM Gem shows a modulation at 0.123…
Detection of hard X-ray pulsations and a strong iron K_beta emission line during an extended low state of GX 1+4
S. Naik, B. Paul, P. J. Callanan
We present here results obtained from a detailed timing and spectral analysis of three BeppoSAX observations of the binary X-ray pulsar GX 1+4 carried out in August 1996, March 199…