The Spectral Energy Distributions of Fermi Blazars
Autor: | Y.H. Yuan, T. X. Hua, Jun-Hui Fan, H. B. Xiao, Yi Liu, Zhiyuan Pei, Jiang-He Yang, G. Y. Luo, Chao Lin, A. Y. Zhou |
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Jazyk: | angličtina |
Rok vydání: | 2016 |
Předmět: |
High Energy Astrophysical Phenomena (astro-ph.HE)
Physics Astrophysics::High Energy Astrophysical Phenomena FOS: Physical sciences Flux Spectral density Astronomy and Astrophysics Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics Rest frame 01 natural sciences Redshift Luminosity Distribution (mathematics) Space and Planetary Science 0103 physical sciences 010306 general physics Blazar Astrophysics - High Energy Astrophysical Phenomena 010303 astronomy & astrophysics Fermi Gamma-ray Space Telescope |
Popis: | (Abridged) In this paper, multi-wavelength data are compiled for a sample of 1425 Fermi blazars to calculate their spectral energy distributions (SEDs). A parabolic function, $\log(\nu F_{\nu}) = P_1(\log\nu - P_2)^2 + P_3,$ is used for SED fitting. Synchrotron peak frequency ($\log \nu_p$), spectral curvature ($P_1$), peak flux ($\nu_{\rm p}F_{\rm \nu_p}$), and integrated flux ($\nu F_{\nu}$) are successfully obtained for 1392 blazars (461 flat spectrum radio quasars-FSRQs, 620 BL Lacs-BLs and 311 blazars of uncertain type-BCUs, 999 sources have known redshifts). Monochromatic luminosity at radio 1.4 GHz, optical R band, X-ray at 1 keV and $\gamma$-ray at 1 GeV, peak luminosity, integrated luminosity and effective spectral indexes of radio to optical ($\alpha_{\rm RO}$), and optical to X-ray ($\alpha_{\rm OX}$) are calculated. The "Bayesian classification" is employed to log$\nu_{\rm p}$ in the rest frame for 999 blazars with available redshift and the results show that 3 components are enough to fit the $\log\nu_{\rm p}$ distribution, there is no ultra high peaked subclass. Based on the 3 components, the subclasses of blazars using the acronyms of Abdo et al. (2010a) are classified, and some mutual correlations are also studied. Conclusions are finally drawn as follows: (1) SEDs are successfully obtained for 1392 blazars. The fitted peak frequencies are compared with common sources from samples available (Sambruna et al. 1996, Nieppola et al. 2006, 2008, Abdo et al. 2010a). (2) Blazars are classified as low synchrotron peak sources (LSPs) if $\log\nu_{\rm p}$(Hz) $\leq 14.0$, intermediate synchrotron peak sources (ISPs) if $14.0 < \log\nu_{\rm p}$(Hz) $\leq 15.3$, and high synchrotron peak sources (HSPs) if $\log\nu_{\rm p}$(Hz) $> 15.3$. (3) $\gamma$-ray emissions are strongly correlated with radio emissions. (...) Comment: ApJS accepted |
Databáze: | OpenAIRE |
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