Extreme refractive lensing in the interstellar medium

Details Extreme refractive lensing in the interstellar medium Extreme refractive lensing in the interstellar medium

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012hell.conf...26z&link_type=abstract

10th Hellenic Astronomical Conference, Proceedings of the conference held at Ioannina, Greece, 5-8 September 2011. Edited by Io

Astronomy and Astrophysics

Astronomy

Scientific paper

In 1987, Fielder et al discovered dramatic and sudden changes in the flux density of a compact radio source during a monitoring campaign of a population of quasars. This was explained as an Extreme Scattering Event (ESE), caused by a strong refractive lens, a few astronomical units in radius, crossing the line of sight to the quasar. A Galactic population of dense and ionized clouds, the exact properties of which remain uncertain, have been proposed to explain these ESEs. These lenses have the potential to affect point-like radio sources, not only quasars but also pulsars. In this work we describe the process of refraction that takes place during an ESE by using two lens models to derive the possible effects on the observed flux density of the background source. We also show how we can use pulsar observations to detect the presence of such lensing objects and therefore further constrain their population estimates and the model that describes them.

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