Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21932105m&link_type=abstract
American Astronomical Society, AAS Meeting #219, #321.05
Astronomy and Astrophysics
Astronomy
Scientific paper
Blazars are powerful, variable emitters from radio to gamma-ray wavelengths. Their double-peaked spectral energy distribution can be explained as synchrotron emission at low energies and as inverse Compton emission at high energies. This general picture is not free of uncertainties and many open issues remain on the relationship between the low and high energy emission. Two related questions are: which radio blazars are gamma-ray emitters? and where is the gamma-ray emission being produced, close to black hole/accretion disk or in the jet as the radio band emission?. To make progress on these questions we have embarked on a flux density monitoring program at 15 GHz using the Owens Valley Radio Observatory 40 meter Telescope. The program started in mid 2007 with a sample of candidate gamma-ray blazars and currently about 1600 sources are observed twice per week. Here we present a description of this monitoring program along with results on the study of correlated time variations between radio and gamma-ray emission for the sources detected with the LAT instrument on board the Fermi Gamma-ray Space Telescope. The existence of correlated variability can be interpreted as an indication of common spatial location for the radio and gamma-ray emission, making the evaluation of its statistical significance a key goal of our program. A study of the statistical significance of these cross-correlations is presented along with a discussion of the Monte Carlo simulations used to evaluate them. More information about the conditions on the radio emission zone can be obtained through polarization monitoring which tells us about the configuration of the magnetic fields on the emission zone. To study radio polarization variability we are building KuPol, a radio polarization receiver for the 12 to 18 GHz band. A description of its capabilities and progress report will be given.
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