Beaming Effect in Fermi Blazars

TL;DR

This study examines the relationship between gamma-ray luminosity and beaming factors in Fermi blazars, finding a strong correlation in FSRQs and BLs, indicating gamma-ray emission is significantly affected by relativistic beaming.

Contribution

It provides new evidence of the correlation between gamma-ray luminosity and radio Doppler factors in blazars, especially highlighting differences between FSRQs and BL Lac objects.

Findings

Gamma-ray luminosity correlates with radio Doppler factors in FSRQs and BLs.

The correlation persists in FSRQs after removing redshift effects.

No significant correlation found for BL Lac objects after partial correlation analysis.

Abstract

The \gamma-ray loud blazars (flat spectrum radio quasars--FSRQs and BL Lacertae objects-BLs) are very bright in the \gamma-ray bands, which is perhaps associated with a beaming effect. Therefore, one can expect that the \gamma-ray luminosity is correlated with the beaming factor. In this paper, we investigated the relation between the radio Doppler factors and the gamma-ray luminosities. Our analysis suggests that the \gamma-ray luminosity be strongly correlated with the factor of \delta_R for the whole sample, FSRQs, and BLs. When the effect of a common redshift is excluded, the correlation still exists for the FSRQs sub-sample suggesting that the \gamma-rays are strongly beamed. However, the partial correlation analysis does not show a correlation for the small BL Lac sample.