Monitoring of Fermi Blazars

In 2007, the 40 M Telescope at the Owens Valley Radio Observatory (OVRO) embarked on a new research campaign. In support of the Fermi Gamma-ray Space Telescope, launched in 2008, the OVRO 40 M Telescope is monitoring more than 1800 blazars about twice per week.

Our paper, Blazars in the Fermi Era: The OVRO 40-Meter Telescope Monitoring Program, describes our observing program in detail and presents results from 2008 and 2009. Extended analysis on the differencies of radio and gamma-ray selected samples using data between 2008 and 2011 is presented in Connecting radio variability to the characteristics of gamma-ray blazars. Other OVRO publications are listed on the OVRO 40m Papers page.

The 40 M measurements at 15 GHz are being compared to the Fermi gamma-ray measurements of the same sources. By looking for correlations in the variability, we are gaining a new understanding of the emission mechanisms at the hearts of Active Galactic Nuclei.

Reduced data for our core sample, the 1158 CGRaBS (Healey et al. 2008) north of -20° declination, are available to the public. The data can be obtained here. Use the user name guest and a blank password for access.

List of all AGN monitored at OVRO can be found here. If you wish to obtain data for a source not listed on our data page, please contact us via email.

The OVRO 40 M Telescope Fermi Blazar Monitoring Program is supported by NASA under awards NNX08AW31G and NNX11A043G, and by the NSF under awards AST-0808050 and AST-1109911.