GPS studies during the ENIGMA era

Details GPS studies during the ENIGMA era GPS studies during the ENIGMA era

Oct 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006enig.confe...7t&link_type=abstract

Proceedings of the 8th ENIGMA meeting, held in Espoo, Finland, September 6-8, 2006, Eds: T.Hovatta, E.Nieppola and I.Torniainen,

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Scientific paper

We have studied two samples of gigahertz-peaked spectrum sources, one consisting of mostly quasars and the other consisting of galaxy-type objects. Among both samples most of the GPS sources lost their GPS status because with competent data sets the shape of the spectrum was not in compliance with a GPS spectrum. Instead a remarkable share of the quasars were actually flat-spectrum sources caught in a flare of which the spectrum is inverted. Also many of the galaxies did not have enough data for solid classifications so, with more observations at different frequencies, they can turn out to be anything from genuine GPS sources to flaring blazars with more observations at different frequencies. This implicates a complicated situation for ESA's Planck mission. In order to study the anisotropies of the cosmic microwave background, the contribution of the foreground emission must be known. The different possibilities instead of classical invariable GPS sources will make predictions complex.

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