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The connection between the 15 GHz radio and gamma-ray emission in blazars

Max-Moerbeck, W. and Richards, J. L. and Hovatta, T. and Pavlidou, V. and Pearson, T. J. and Readhead, A. C. S. and King, O. G. and Reeves, R. (2014) The connection between the 15 GHz radio and gamma-ray emission in blazars. In: Extragalactic jets from every angle. Proceedings of the International Astronomical Union. Vol.10. No.S313. Cambridge University Press , Cambridge, pp. 17-20. ISBN 9781107078741.

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Since mid-2007 we have carried out a dedicated long-term monitoring programme at 15 GHz using the Owens Valley Radio Observatory 40 meter telescope (OVRO 40m). One of the main goals of this programme is to study the relation between the radio and gamma-ray emission in blazars and to use it as a tool to locate the site of high energy emission. Using this large sample of objects we are able to characterize the radio variability, and study the significance of correlations between the radio and gamma-ray bands. We find that the radio variability of many sources can be described using a simple power law power spectral density, and that when taking into account the red-noise characteristics of the light curves, cases with significant correlation are rare. We note that while significant correlations are found in few individual objects, radio variations are most often delayed with respect to the gamma-ray variations. This suggests that the gamma-ray emission originates upstream of the radio emission. Because strong flares in most known gamma-ray-loud blazars are infrequent, longer light curves are required to settle the issue of the strength of radio-gamma cross-correlations and establish confidently possible delays between the two. For this reason continuous multiwavelength monitoring over a longer time period is essential for statistical tests of jet emission models.

Item Type:Book Section
Related URLs:
URLURL TypeDescription
Max-Moerbeck, W.0000-0002-5491-5244
Hovatta, T.0000-0002-2024-8199
Pearson, T. J.0000-0001-5213-6231
Readhead, A. C. S.0000-0001-9152-961X
Additional Information:© 2015 International Astronomical Union.
Subject Keywords:galaxies: active, radio continuum: galaxies, gamma rays: galaxies, quasars: general, BL Lacertae objects: general, methods: data analysis, methods: statistical, techniques: miscellaneous
Series Name:Proceedings of the International Astronomical Union
Issue or Number:S313
Record Number:CaltechAUTHORS:20181211-093929289
Persistent URL:
Official Citation:Max-Moerbeck, W., Richards, J., Hovatta, T., Pavlidou, V., Pearson, T., Readhead, A., . . . Reeves, R. (2014). The connection between the 15 GHz radio and gamma-ray emission in blazars. Proceedings of the International Astronomical Union, 10(S313), 17-20. doi:10.1017/S1743921315001799
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:91676
Deposited By: Tony Diaz
Deposited On:11 Dec 2018 17:52
Last Modified:09 Mar 2020 13:19

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