Variability of Blazars

Jiang, Fan; Liu, Y.; Li, Y.; Zhang, Q. F.; Tao, Jun; Kurtanidze, O. M.

doi:10.1007/s12036-011-9037-0

Cited by 23 publications

(8 citation statements)

References 41 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…( Abdo et al 2009a( Abdo et al , 2010bAcero et al 2015;Ackermann et al 2011aAckermann et al ,b, 2015Aller et al 2011;Bai, et al 1998;Bastieri et al 2011;Chen et al, 2012;Fan & Xie 1996;Fan et al 2011;Ghisellini et al 2010;Gu 2014;Gu & Li 2013;Gupta 2011;Gupta et al 2012;Hu, et al 2006;Marscher et al 2011;Nolan et al 2012;Romero et al 2002;Urry 2011;Wills et al 1992;Wu, et al 2007;Yang et al 2010aYang et al ,b, 2012aYang et al ,b, 2014You & Cao, 2014). Quite recently, Massaro et al (2015) published the largest blazar sample (The 5th edition of the Roma-BZCAT, see the BZCAT 5.0 (http://www.asdc.asi.it/bzcat/).…”

Section: Introductionmentioning

confidence: 99%

The Spectral Energy Distributions of Fermi Blazars

Jiang¹,

Yang²,

Liu³

et al. 2016

ApJS

Self Cite

166

180

View full text Add to dashboard Cite

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(νF ν ) = P 1 (logν − P 2 ) 2 + P 3 , is used for SED fitting. Synchrotron peak frequency (logν p ), spectral curvature (P 1 ), peak flux (ν p F νp ), and integrated flux (νF ν ) are successfully obtained for 1392 blazars (461 flat spectrum radio quasarsFSRQs, 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 γ-ray at 1 GeV, peak luminosity, integrated luminosity and effective spectral indexes of radio to optical (α RO ), and optical to X-ray (α OX ) are calculated. The "Bayesian classification" is employed to logν p in the rest frame for 999 blazars with available redshift and the results show that 3 components are enough to fit the logν 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) -2 -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. (3) γ-ray emissions are strongly correlated with radio emissions. γ-ray luminosity is also correlated with synchrotron peak luminosity and integrated luminosity. (4) There is an anti-correlation between peak frequency and peak luminosity within the whole blazar sample. However, there is a marginally positive correlation for HBLs, and no correlations for FSRQs or LBLs. (5) There are anti-correlations between the monochromatic luminosities (γ-ray and radio bands) and the peak frequency within the whole sample and BL Lacs. (6) The optical to X-ray (α OX ) and radio to optical (α RO ) spectral indexes are strongly anti-correlated with peak frequency (log ν p ) within the whole sample, but the correlations for subclasses of FSRQs, LBLs, and HBLs are different.

show abstract

Section: Introductionmentioning

confidence: 99%

The Spectral Energy Distributions of Fermi Blazars

Jiang¹,

Yang²,

Liu³

et al. 2016

ApJS

Self Cite

166

180

View full text Add to dashboard Cite

show abstract

“…In fusion research the theory of 'blobs' (isolated field aligned plasma structures that are similar to flux tubes but not necessarily frozen to the field) has been extensively researched [30]. Fan summarises the work on gravitational stability and flux tubes for solar convection in [31] see also [32], [33] and [34]. Much of the research on flux tubes concerns tubes in an otherwise unmagnetised plasma where circular tubes might be expected.…”

Section: Introductionmentioning

confidence: 99%

Explosive instability and erupting flux tubes in a magnetized plasma

Cowley

Henneberg

et al. 2015

Proc. R. Soc. A.

View full text Add to dashboard Cite

The eruption of multiple flux tubes in a magnetized plasma is proposed as a mechanism for explosive release of energy in plasmas. A significant fraction of the linearly stable isolated flux tubes are shown to be metastable in a box model magnetized atmosphere in which ends of the field lines are embedded in conducting walls. The energy released by destabilizing such field lines can be a large proportion of the gravitational energy stored in the system. This energy can be released in a fast dynamical time.

show abstract

“…Blazars are an extreme subclass of active galactic nuclei (AGNs), that show rapid and large variability, high and variable polarization, superluminal motions in their radio components, and strong γ-ray emissions, etc (see Abdo et al 2009Abdo et al , 2010Ackermann et al 2011;Aller et al 2011;Bastieri et al 2011;Fan et al 1996Fan et al , 2011Ghisellini et al 2010;Gupta 2011;Marscher et al 2011;Nolan et al 2012;Romero et al 2002;Wills et al 1992;Urry 2011). There are two subclasses of blazars, namely flat spectrum radio quasars (FSRQs) and BL Lacertae objects (BLs) with the former showing strong emission line features and the latter showing very weak emission lines or no emission lines at all.…”

Section: Introductionmentioning

confidence: 99%

The gamma-ray Doppler factor determinations for a Fermi blazar sample

Fan

Yang

Liu

et al. 2013

Res. Astron. Astrophys.

View full text Add to dashboard Cite

Observations suggest that γ-ray loud blazars are strongly beamed. The Fermi mission has detected many of blazars, which provide us with a good opportunity to investigate the emission mechanism and the beaming effect in the γ-ray region. We compiled the X-ray observations for 138 Fermi blazars (54 flat spectrum radio quasars, 36 low-peaked BL Lacertae objects, and 48 high-peaked BL Lacertae objects) and calculated their Doppler factors, δ γ. It is interesting that the calculated Doppler factors, δ γ , are strongly correlated with the γ-ray luminosity.

show abstract

Variability of Blazars

Cited by 23 publications

References 41 publications

The Spectral Energy Distributions of Fermi Blazars

The Spectral Energy Distributions of Fermi Blazars

Explosive instability and erupting flux tubes in a magnetized plasma

The gamma-ray Doppler factor determinations for a Fermi blazar sample

Contact Info

Product

Resources

About