Zhang Haiming1; Zhang Jin2; Lu Ruijing1; Yi Tingfeng3; Huang Xiaoli1; Liang Enwei1
Source Publicationresearchinastronomyandastrophysics
AbstractWe analyze the long-term lightcurve of 3C 454.3 observed with Fermi/LAT and investigate its relation to flux in the radio,optical and X-ray bands.By fitting the 1-day binned Ge V lightcurve with multiple Gaussian functions(MGF),we propose that the typical variability timescale in the Ge V band is 1–10 d.The Ge V flux variation is accompanied by the spectral variation characterized as fluxtracking,i.e.,"harder when brighter."The Ge V flux is correlated with the optical and X-ray fluxes,and a weak correlation betweenγ-ray flux and radio flux is also observed.Theγ-ray flux is not correlated with the optical linear polarization degree for the global lightcurves,but they show a correlation for the lightcurves before MJD 56000.The power density spectrum of the global lightcurve shows an obvious turnover at~7.7 d,which may indicate a typical variability timescale of 3C 454.3 in theγ-ray band.This is also consistent with the derived timescales by fitting the global lightcurve with MGF.The spectral evolution and an increase in the optical linear polarization degree along with the increase inγ-ray flux may indicate that the radiation particles are accelerated and the magnetic field is ordered by the shock processes during the outbursts.In addition,the nature of 3C 454.3 may be consistent with a self-organized criticality system,similar to Sagittariusand thus the outbursts could be from plasmoid ejections driven by magnetic reconnection.This may further support the idea that the jet radiation regions are magnetized.
Document Type期刊论文
Recommended Citation
GB/T 7714
Zhang Haiming,Zhang Jin,Lu Ruijing,et al. fluxandspectralvariationcharacteristicsof3c4543atthegevband[J]. researchinastronomyandastrophysics,2018,018(004):40.
APA Zhang Haiming,Zhang Jin,Lu Ruijing,Yi Tingfeng,Huang Xiaoli,&Liang Enwei.(2018).fluxandspectralvariationcharacteristicsof3c4543atthegevband.researchinastronomyandastrophysics,018(004),40.
MLA Zhang Haiming,et al."fluxandspectralvariationcharacteristicsof3c4543atthegevband".researchinastronomyandastrophysics 018.004(2018):40.
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