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Article
The Hubble diagram of metal-rich QSOs and deceleration parameter q0
For 163 metal-rich Quasars, the mv-logZ diagram shows a very close correlation. Using multiple regression analysis for these sources (N = 163), we obtained q0,= 1.142 and correlation coefficient γ = 0.69. These r...
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Article
Chandra observations of the H2O megamaser galaxy Mrk1210
We present the first Chandra X-ray observations of the H2O megamaser galaxy Mrk1210 (UGC4203), a Seyfert 2 galaxy at an approximate distance of D ∼ 57.6 Mpc. The Chandra X-ray image, with by far the highest angul...
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Article
An X-ray luminosity analysis for FRIs and FRIIs
Radio galaxies are divided into two groups according to their luminosities at 178 MHz, namely Fanaroff-Riley type Is (FRIs) and Fanaroff-Riley type IIs (FRIIs) with FRIs showing lower radio luminosities than F...
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Article
The line emissions and polarization in blazars
The correlations between broad-line emission, polarization, and core-dominance parameters are investigated for a sample of 148 blazars (BL Lacertae objects-BLs and flat spectrum radio quasars-FSRQs). An anti-c...
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Article
Duration distributions for different softness groups of gamma-ray bursts
Gamma-ray bursts (GRBs) are divided into two classes according to their durations. We investigate if the softness of bursts plays a role in the conventional classification of the objects. We employ the BATSE (...
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Article
The central black hole masses for the γ-ray loud blazars
The Large Area Telescope (LAT) on the Fermi Gamma-ray Space Telescope (formerly GLAST) provides an increase in sensitivity and has detected rapid variability of gamma-ray sources. The variability time scales d...
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Article
Relativistic beaming effect for blazars
In this paper, we revisit the relationship between the spectral index and the core-dominance parameter using a larger sample of 157 blazars (23 BL Lacertae objects and 134 flat spectrum radio quasars), compile...
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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
The gamma-ray spectral index changes for blazars
Based upon Fermi 1FGL and EGRET 3EG samples, a sample including 79 blazars (53 FSRQs, 26 BL Lacs) is presented. It is investigated that the correlations between the ratio of EGRET to Fermi blazars γ-ray flux dens...
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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
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
Some statistical correlation analyses for Fermi/LAT Blazars
A sample including 664 blazars (301 Flat Spectrum Radio Quasars and 363 BL Lacs) with γ-ray data in both 1FGL and 2FGL catalogues were selected. The average values of both γ-photon average energy and the photon s...
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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
The \(\gamma\) -ray spectral changes in Fermi blazars
Based upon Fermi 2FGL and 3FGL catalogues, a sample of 842 blazars (hereinto 356 FSRQs, 486 BL Lac objects) is collected to discuss the changes of ...
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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
Construction of Tooth Modeling Solutions of Face Gear Drives with an Involute Pinion
Face gear tooth modeling is one of the study foundations of face gear drives. However, existed face gear tooth modeling solutions, namely traditional conjugation theories, could not express face gear tooth geo...
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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
Radio core dominance of Fermi/LAT-detected AGNs
We present a sample of 4388 AGNs with available radio core-dominance parameters—defined as the ratio of the core flux densities to the extended ones, R = Score/Sext.—which includes 630 Fermi-detected AGNs from th...
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Article
The spectral index study for Fermi blazars
In this work, we compiled a sample of 1172 4FGL blazars with available spectral information and broadband intensities to the study the spectral indices. Based on this sample, we studied the correlations of spe...
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Article
Two-component model of the X-ray emissions for \(\mathit {Fermi}\) -LAT selected blazars
In a two-component model, the total observed emissions are the sum of two contributions, namely a beamed one and an unbeamed one. The observed beamed emissions from a relativistic jet are strongly boosted due ...
