Next Article in Journal / Special Issue
18–22 cm VLBA Observational Evidence for Toroidal B-Field Components in Six AGN Jets
Previous Article in Journal / Special Issue
Multi-Frequency Blazar Micro-Variability as a Tool to Investigate Relativistic Jets
Open AccessArticle

The Classifications and Some Correlations for Fermi Blazars

Center for Astrophysics, Guangzhou University, Guangzhou 510006, China
Astronomy Science and Technology Research Laboratory of Department of Education of Guangdong Province, Guangzhou 510006, China
Department of Physics and Electronics Science, Hunan University of Arts and Science, Changde 415000, China
Author to whom correspondence should be addressed.
Academic Editors: Jose L. Gómez, Alan P. Marscher and Svetlana G. Jorstad
Galaxies 2016, 4(3), 16;
Received: 14 July 2016 / Revised: 17 August 2016 / Accepted: 17 August 2016 / Published: 29 August 2016
(This article belongs to the Special Issue Blazars through Sharp Multi-wavelength Eyes)
PDF [1430 KB, uploaded 29 August 2016]


In a recent paper, we constructed the spectral energy distributions (SEDs) for 1425 Fermi blazars. We classify them as low synchrotron peak sources (LSPs) if log ν p ( Hz ) 14.0, intermediate synchrotron peak sources (ISPs) if 14.0 < log ν p ( Hz ) 15.3 , and high synchrotron peak sources (HSPs) if log ν p ( Hz ) > 15.3 . We obtain an empirical relation to estimate the synchrotron peak frequency, ν p Eq . from effective spectral indexes α o x and α r o as log ν p Eq . = 16 + 4.238 X if X < 0 , and log ν p Eq . = 16 + 4.005 Y if X > 0 , where X = 1.0 1.262 α r o 0.623 α o x and Y = 1.0 + 0.034 α r o 0.978 α o x . In the present work, we investigate the correlation between the peak frequency and the radio-to-X-ray spectral index, between peak luminosity (bolometric luminosity) and γ-ray/optical luminosity, and between peak luminosity and bolometric luminosity. Some discussion is presented. View Full-Text
Keywords: galaxies: active; galaxies: jets; galaxies: nuclei galaxies: active; galaxies: jets; galaxies: nuclei

Graphical abstract

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 (CC BY 4.0).

Share & Cite This Article

MDPI and ACS Style

Fan, J.; Liu, Y.; Yang, J.; Lin, C.; Hao, J.; Xiao, H. The Classifications and Some Correlations for Fermi Blazars. Galaxies 2016, 4, 16.

Show more citation formats Show less citations formats

Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Related Articles

Article Metrics

Article Access Statistics



[Return to top]
Galaxies EISSN 2075-4434 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top