Polarisation in quasars

Axions and polarisation of quasars

We present results showing that, thanks to axion-photon mixing in external magnetic fields, it is actually possible to produce an effect similar to the one needed to explain the large-scale coherent orientations of quasar polarisation vectors in visible light that have been observed in some regions of the sky.

Do Quasars Lens Quasars?

If the unexpectedly high frequency of quasar pairs with very different component redshifts is due to the lensing of a population of background quasars by the foreground quasar, typical lens masses must be ∼ 10M⊙ and the sum of all such quasar lenses would have to contain ∼ 0.005 times the closure density of the Universe. It then seems plausible that a very high fraction of all ∼ 10M⊙ gravitatio...

Circular Polarisation in AGN

We discuss the constraints that recent observations place on circular polarisation in AGN. In many sources the circular polarisation is variable on short timescales, indicating that it originates in compact regions of the sources. The best prospects for gleaning further information about circular polarisation are high resolution VLBI and scintillation ‘imaging’ which probe source structure on m...

Employment Polarisation in Australia

Whilst employment levels in Australia are healthy when compared to those twenty years ago, the available work has become increasingly polarised into either all-work or no-work households. This paper measures the extent of polarisation that has taken place in Australia since 1982 with a measure that accounts for changes in individual based employment and family structure. We find that employment...

Job Polarisation in Denmark ?