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249 papers · 2 filters
High brightness temperatures and circular polarisation in extra-galactic radio sources
J. G. Kirk, O. Tsang
Some rapidly variable extra-galactic radio sources show very high brightness temperatures T_B>10^{12}K and high degrees of circular polarisation (1%). Standard synchrotron models t…
PMAS: The Potsdam Multi Aperture Spectrophotometer. II. The Wide Integral Field Unit PPak
Andreas Kelz, Marc A. W. Verheijen, Martin M. Roth +6
PPak is a new fiber-based Integral Field Unit (IFU), developed at the Astrophysical Institute Potsdam, implemented as a module into the existing PMAS spectrograph. The purpose of P…
The long period Intermediate Polar 1RXSJ154814.5-452845
D. de Martino, J. -M. Bonnet-Bidaud, M. Mouchet +3
We present the first time resolved medium resolution optical spectroscopy of the recently identified peculiar Intermediate Polar (IP) 1RXSJ154814.5-452845, which allows us to preci…
A Systematic Search for Periodicities in RXTE/ASM Data
Linqing Wen, Alan M. Levine, Robin H. D. Corbet +1
We present the results of a systematic search in 8.5 years of Rossi X-ray Timing Explorer All-Sky Monitor data for evidence of periodicities. The search was conducted by applicatio…
Neutron-loaded outflows in gamma-ray bursts
Elena M. Rossi, Andrei M. Beloborodov, Martin J. Rees
Relativistic neutron-loaded outflows in gamma-ray bursts are studied at their early stages, before deceleration by a surrounding medium. The outflow has four components: radiation,…
The Fundamental Scaling Relations of Elliptical Galaxies
B. Robertson, T. J. Cox, L. Hernquist +4
(ABRIDGED) We examine the fundamental scaling relations of elliptical galaxies formed through mergers. Using hundreds of simulations to judge the impact of progenitor galaxy proper…