Exploring the relation between (sub-)millimeter radiation and gamma-ray emission in blazars with Planck and Fermi

TL;DR

This study investigates the connection between (sub-)millimeter and gamma-ray emissions in blazars using data from Planck and Fermi, revealing significant correlations especially with quasi-simultaneous observations and spectral features.

Contribution

It provides new insights into the timing and spectral conditions under which (sub-)mm and gamma-ray emissions are correlated in blazars.

Findings

Gamma-ray and (sub-)mm luminosities are correlated over five orders of magnitude.

Correlation significance depends on the simultaneity of observations, being strongest within 2 months.

Blazars with spectral turnover in the mm-wave regime are more likely to be strong gamma-ray emitters.

Abstract

The coexistence of Planck and Fermi satellites in orbit has enabled the exploration of the connection between the (sub-)millimeter and gamma-ray emission in a large sample of blazars. We find that the gamma-ray emission and the (sub-)mm luminosities are correlated over five orders of magnitude. However, this correlation is not significant at some frequency bands when simultaneous observations are considered. The most significant statistical correlations, on the other hand, arise when observations are quasi-simultaneous within 2 months. Moreover, we find that sources with an approximate spectral turnover in the middle of the mm-wave regime are more likely to be strong gamma-ray emitters. These results suggest a physical relation between the newly injected plasma components in the jet and the high levels of gamma-ray emission.