Preprint Article Version 1 NOT YET PEER-REVIEWED

# The Classifications and Some Correlations for Fermi Blazars

Junhui Fan 1,2,* , Y Liu 1,2 , J.H. Yang 3 , C Lin 1,2 , J.M. Hao 1,2
1. Center for Astrophysics, Guangzhou University, Guangzhou 510006, China
2. Astronomy Science and Technology Research Laboratory of Department of Education of Guangdong Province, Guangzhou 510006, China
3. Department of Physics and Electronics Science, Hunan University of Arts and Science, Changde 415000, China
Version 1 : Received: 14 July 2016 / Approved: 15 July 2016 / Online: 15 July 2016 (09:37:39 CEST)

Copyright: This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

How to cite: Fan, J.; Liu, Y.; Yang, J.; Lin, C.; Hao, J. The Classifications and Some Correlations for Fermi Blazars. Preprints 2016, 2016070036 (doi: 10.20944/preprints201607.0036.v1). Fan, J.; Liu, Y.; Yang, J.; Lin, C.; Hao, J. The Classifications and Some Correlations for Fermi Blazars. Preprints 2016, 2016070036 (doi: 10.20944/preprints201607.0036.v1).

A peer-reviewed article of this Preprint also exists.

Journal reference: Galaxies 2016, 4, 16
DOI: 10.3390/galaxies4030016

## Abstract

In a recent paper, we calculate spectral energy distributions (SEDs) for 1425 Fermi blazars, classifications of low synchrotron peak sources (LSPs) if log $\nu_{\rm p} (\rm Hz) \leq$ 14.0, intermediate synchrotron peak sources (ISPs) if $14.0 < \,\log\, \nu_{\rm p} (\rm Hz) \leq 15.3$, and high synchrotron peak sources (HSPs) if $\log\, \nu_{\rm p} (\rm Hz) > 15.3$ are made based on 999 logarithms of synchrotron peak frequencies with known redshift, and we obtain an empirical relation to estimate the synchrotron peak frequency, $\nu_{\rm p}^{\rm Eq.}$ from effective spectral indexes $\alpha_{ox}\, {\rm and}\, \alpha_{ro}$ as $\log \nu_{\rm p}^{\rm Eq.} = 16+4.238X$ if $X < 0$, and $\log \nu_{\rm p}^{\rm Eq.} = 16+4.005Y$ if $X > 0$, where $X = 1.0 - 1.262 \alpha_{ro} - 0.623 \alpha_{ox}$, and $Y = 1.0 + 0.034 \alpha_{ro} - 0.978 \alpha_{ox}$ \cite{Fan16}. In the present work, we investigate the correlation between the peak frequency and the radio to X-ray spectral index, that between peak luminosity (integrated luminosity) and $\gamma$-ray/optical luminosity, and that between peak luminosity and integrated luminosity. Some discussions are presented.

## Subject Areas

galaxies: active; galaxies: jets; galaxies: nuclei