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Article
Estimation of inverse Compton peak frequency for 4FGL Blazars
This study uses a parabolic equation to fit the Inverse Compton (IC) spectral component of 3743 blazars (794 FSRQs, 1432 BL Lacs, and 1517 BCUs) from the 4FGL-DR3 catalog. Some mutual correlations are investig...
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Article
Comparison between Fermi detected and non-Fermi detected superluminal sources
Active galactic nuclei (AGNs) have been attracting research attention due to their special observable properties. Specifically, a majority of AGNs are detected by Fermi-LAT missions, but not by Fermi-LAT, whic...
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Article
Effective spectral index properties for Fermi blazars
Blazars are a special subclass of active galactic nuclei with extreme observation properties. This subclass can be divided into two further subclasses of flat spectrum radio quasars (FSRQs) and BL Lacertae obj...
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Article
The relationship between the spectrum and flux density of 3C273 and 3C446
In the radio band, the relationship between the emission spectrum (α) and flux density (F) can demonstrate the emission theory and process. In this paper, we used the radio data of 3C273 and 3C446 from UMRAO (the...
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Article
Relation between Radio Polarization and Spectral Index of Blazars
University Michigan RAdio Observatory (UMRAO) supply many radio photometries and polarimetries. We select a sample of 81 blazars from UMRAO and analyse the correlations between their spectral index and polariz...
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Article
X-ray spectral indices of the Fermi/LAT blazars
In this work, we analyze the X-ray spectral indices of the 245 Fermi-detected blazars. Relations between the γ-ray emission and the X-ray emission are our research focuses. Our analysis shows that: (1) the X-ray ...
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Article
Radio spectral index of BL Lac objects
In this paper, the preliminary data from University of Michigan Radio Astronomy Observatory database (UMRAO) are used to discuss the radio spectral index properties of 8 BL Lacs. To do so, we calculated the ra...
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Article
Lorentz factor estimation for radio sources
In this paper, a sample including 68 blazars (18 BL Lacs and 50 FSRQs) with known Doppler factors and superluminal velocity from our previous papers is presented. Both the Lorentz factors (Γ) and viewing angles (
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Article
Radio variability for OJ287 and 3C279
Based on the new data from the database of the University of Michigan Radio Astronomy Observatory (UMRAO), we analyze the spectral index and optical variability of OJ287 and 3C279. The main results show that 1...
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Article
Long-term Periodicity Analysis of Polarization Variation for Radio Sources
We use the database of University of Michigan Radio Astronomy Observatory (UMRAO) at three radio bands (4.8, 8 and 14.5 GHz) to analyse the long-term polarization variation in search of the possible periodicit...
