Blazar Observations in Infrared and Optical Regions: Magnetic Field Strength Evaluation

Yefimov, Yu. S.

doi:10.1007/s12036-011-9062-z

Cited by 3 publications

(2 citation statements)

References 20 publications

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“…Blazars are exciting subclass of active galactic nuclei (AGNs) that are thought to be very bright and inconsistent sources of high energy (Abdo et al 2009(Abdo et al , 2010aYefimov 2011). They reportedly have other outstanding observational features like large and variable luminosity, continuous spectral energy distributions (SEDs), apparent superluminal motions, high and variable polarization and very active GeV to TeV γ-ray emissions (Andruchow et al 2005;Abdo et al 2010b;Yang et al 2018).…”

Section: Introductionmentioning

confidence: 99%

Spectral Properties of Fermi Blazars and their Unification Schemes

et al. 2020

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We use the distributions of spectral indices (αv ) of a large homogenous sample of Fermi-detected blazars to re-investigate the relationship between flat spectrum radio quasars (FSRQs) and subclasses of BL Lac objects (BL Lacs). We compute the broadband synchrotron and Compton spectral indices from radio-to-X-ray and X-ray to y-ray bands, respectively. Analyses of our data show continuity in the distributions of the spectral indices from FSRQs to HSP through LSP and ISP subclasses of BL Lacs. We find from y-ray luminosity distribution that the jetted radio galaxies form the low-luminosity tail of the distribution, which is suggestive that the sequence can be extended to the young jetted galaxy populations. We observe a significant difference in the shape of Compton and synchrotron spectra: significant anti-correlation (r ∼−0.80) exists between the broadband Compton and synchrotron spectral indices. Furthermore, the broadband spectral indices vary significantly with redshift (z) at low redshift (z < 0.3) and remain fairly constant at high (z ≥ 0.3) redshift. The trend of the variations suggests a form of evolutionary connection between subclasses of blazars. Thus, while selection effect may be significant at low redshift, evolutionary sequence can also be important. Our results are not only consistent with a unified scheme for blazars and their young jetted galaxy counterparts but also suggest that the broadband spectral sequence of blazars is not a secondary effect of redshift dependence.

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Section: Introductionmentioning

confidence: 99%

Spectral Properties of Fermi Blazars and their Unification Schemes

et al. 2020

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“…(e.g. Abdo et al 2009Abdo et al , 2010aAller et al 2011;Bastieri 2011;Cellone et al 2007;Ciprini et al 2007;Fan et al , 2011Fan 2012;Ghisellini et al 2010;Gupta 2011;Gupta et al 2004;Marscher et al 2011;Romero et al 2002;Wills et al 1992;Wagner 2010;Urry 2011;Yefimov 2011).…”

Section: Introductionunclassified

Beaming Effect in Fermi Blazars

Jiang¹,

Yang²,

Zhang³

et al. 2013

Publications of the Astronomical Society of Japan

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The γ-ray loud blazars (flat spectrum radio quasars-FSRQs and BL Lacertae objects-BLs) are very bright in the γ-ray bands, which is perhaps associated with a beaming effect. Therefore, one can expect that the γ-ray luminosity is correlated with the beaming factor. In this paper, we investigated the relation between the radio Doppler factors and the gamma-ray luminosities. Our analysis suggests that the γ-ray luminosity be strongly correlated with the factor of δ R for the whole sample, FSRQs, and BLs. When the effect of a common redshift is excluded, the correlation still exists for the FSRQs sub-sample suggesting that the γ-rays are strongly beamed. However, the partial correlation analysis does not show a correlation for the small BL Lac sample.

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