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14th of August 2015
The Spectral Revolution has Begun
by Joe Callingham (Sydney Uni)
Callingham et al. (2015) present broadband observations and spectral modeling of PKS B0008-421 and identify it as an extreme gigahertz-peaked spectrum (GPS) source. PKS B0008-421 is characterized by the steepest known spectral slope below the turnover, close to the theoretical limit of synchrotron self-absorption, and the smallest known spectral width of any GPS source. Spectral coverage of the source spans from 0.118 to 22 GHz, which includes data from the Murchison Widefield Array (MWA) and the wide bandpass receivers on the Australia Telescope Compact Array (ATCA). - The above image shows PKS 0008-421 as detected in the GLEAM survey at 158 MHz overlaid onto the spectral energy distribution (SED) from MWA and the ATCA.

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