SIMBAD references

2015MNRAS.452.1280R - Mon. Not. R. Astron. Soc., 452, 1280-1294 (2015/September-2)

Locating the γ-ray emission site in Fermi/LAT blazars from correlation analysis between 37 GHz radio and γ-ray light curves.

RAMAKRISHNAN V., HOVATTA T., NIEPPOLA E., TORNIKOSKI M., LAHTEENMAKI A. and VALTAOJA E.

Abstract (from CDS):

We address the highly debated issue of constraining the γ-ray emission region in blazars from cross-correlation analysis using discrete correlation function between radio and γ-ray light curves. The significance of the correlations is evaluated using two different approaches: simulating light curves and mixed source correlations. The cross-correlation analysis yielded 26 sources with significant correlations. In most of the sources, the γ-ray peaks lead the radio with time lags in the range +20 and +690 d, whereas in sources 1633+382 and 3C 345 we find the radio emission to lead the γ-rays by -15 and -40 d, respectively. Apart from the individual source study, we stacked the correlations of all sources and also those based on subsamples. The time lag from the stacked correlation is +80 d for the whole sample and the distance travelled by the emission region corresponds to 7 pc. We also compared the start times of activity in radio and γ-rays of the correlated flares using Bayesian block representation. This shows that most of the flares at both wavebands start at almost the same time, implying a co-spatial origin of the activity. The correlated sources show more flares and are brighter in both bands than the uncorrelated ones.

Abstract Copyright: © 2015 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society (2015)

Journal keyword(s): radiation mechanisms: non-thermal - galaxies: active - galaxies: jets - galaxies: nuclei - gamma rays: galaxies - radio continuum: galaxies

Simbad objects: 57

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2019.10.24-07:34:47

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