The luminosity correlation analysis for Fermi blazars

• Published in: Astrophysics and space science 2018-07, Vol.363 (7), p.1-19, Article 142
• Main Authors: Zhang, L. X., Fan, J. H.
• Format: Article
• Language: English
• Subjects: Astrobiology; Astronomy; Astrophysics; Astrophysics and Astroparticles; BL Lacertae objects; Blazars; Correlation analysis; Cosmology; Energy bands; Gamma emission; Luminosity; Observations and Techniques; Original Article; Physics; Physics and Astronomy; Quasars; Radio emission; Regression analysis; Space Exploration and Astronautics; Space Sciences (including Extraterrestrial Physics; X-ray emissions; X-rays
• ISSN: 0004-640X; 1572-946X
• DOI: 10.1007/s10509-018-3363-5

In this paper, multiwavelength chromatic luminosity at radio ( log L R ), optical ( log L O ), X-ray ( log L X ), and γ -rays ( log L γ ) for a sample of 442 Fermi blazars with known redshifts are collected from Fan et al. ( 2016 ), to study the correlations between the γ -rays and the low-energy bands using a multiple linear regression analysis. In this way, we can see which band is more important for the γ -ray emissions. Mutual correlation analysis is also used to discuss the correlations between the γ -ray and the low energy bands for the whole sample and subclasses. We come to following conclusions: The multiple linear correlation indicates that the γ -rays are correlated with the radio, optical and the X-ray emissions for the whole sample and the subclasses of flat spectrum radio quasars (FSRQs) and BL Lac objects (BL Lacs), the correlation between the γ -rays and the radio emissions is the strongest one. For BL Lacs, the optical emissions are more important than the X-rays for the γ -rays, while the X-ray emissions are more important than optical ones in FSRQs. The γ -ray emissions in HBL are from an synchrotron self-Compton, while those in FSRQs may be from external Compton and synchrotron self-Compton as well.