RELATIVISTIC JET PROPERTIES OF GeV-TeV BLAZARS AND POSSIBLE IMPLICATIONS FOR THE JET FORMATION, COMPOSITION, AND CAVITY KINEMATICS

Zhang, Jin; Sun, Xiao-Na; Liang, En‐Wei; Lu, Rui-Jing; Lu, Yuexiang; Zhang, Shuang‐Nan

doi:10.1088/0004-637x/788/2/104

Cited by 73 publications

(141 citation statements)

References 98 publications

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“…The broadband SED is fitted with a simple one-zone leptonic jet model, which consists of synchrotron, synchrotron selfCompton (SSC) and external-Compton (EC) processes (e.g., Ghisellini & Tavecchio 2009;Sun et al 2014;Zhang et al 2014), plus emission from an accretion disk/corona. The χ 2 minimization technique is applied to perform the fitting (see Zhang et al 2014, for details).…”

Section: Broadband Sedmentioning

confidence: 99%

THEγ-RAY DETECTED NARROW-LINE SEYFERT 1 GALAXY 1H 0323+342:SWIFTMONITORING ANDSUZAKUSPECTROSCOPY

Yao

Yuan

Komossa

et al. 2015

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As a radio-loud narrow-line Seyfert 1 galaxy (NLS1) detected by Fermi/LAT in GeV γ-rays, 1H 0323+342 is a remarkable active galactic nucleus showing properties characteristic of both NLS1s and blazars. Here we present results of simultaneous X-ray and UV/optical monitoring observations on 1H 0323+342 taken with the UV/Optical Telescope and X-ray Telescope onboard the Swift satellite over six years from 2006. Overall, the object showed statistically correlated variations in both the UV and X-ray bands on timescales of years as well as on timescales of days. A deep Suzaku observation reveals X-ray variability on timescales as short as a few tens of thousand seconds, and an X-ray spectrum typical of Seyfert galaxies. The broadband spectral energy distribution, for which the data of UV and X-ray observations taken on 2009 July 26-27 were used, can be well modeled with a simple one-zone leptonic jet model plus accretion disk/corona emission. The latter is predominantly responsible for the UV/optical and X-ray (0.3-10 keV) emission and their observed variations. The correlated UV-X-ray variability on the timescale of days is consistent with reprocessing of the X-ray radiation by the accretion disk. The shortest timescale and large normalized excess variance of the X-ray variability detected with Suzaku suggest a relatively small black hole mass of the order of M 10 7  , consistent with the estimation based on the broad Hβ line in the optical.

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Section: Broadband Sedmentioning

confidence: 99%

THEγ-RAY DETECTED NARROW-LINE SEYFERT 1 GALAXY 1H 0323+342:SWIFTMONITORING ANDSUZAKUSPECTROSCOPY

Yao

Yuan

Komossa

et al. 2015

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“…Pure SSC model was widely adopted in fitting the multi-wavelength SED of HBL BL Lacs (e.g., Mastichiadis & Kirk 1997;Krawczynski et al 2004;Zhang et al 2014), while luminous FSRQs prefer SSC+EC model (e.g., Sambruna et al 1999;Chen & Bai 2011;Yan et al 2014). Böttcher & Chiang (2002) proposed that the EC from BLR may play a role in some intermediate and low-energy-peaked BL lacs.…”

Section: Conclusion and Discussionmentioning

confidence: 99%

“…Mankuzhiyil et al 2011;Zhang et al 2012Zhang et al , 2014Kang et al 2014). Similar to Aleksić et al (2014), the nonsimultaneous radio data (the blue filled square in Figure 1) is also included in χ 2 fitting, due to a possible correlation between radio and optical emission which suggest a common origin of the two bands emission (Aleksić et al 2014).…”

Section: Modeling the Seds Of Pks 1424+240mentioning

confidence: 99%

“…Then we derive the probability distribution of χ 2 r (e.g., p ∝ exp(−χ 2 r )), and the maximum probability corresponds the best-fit parameters. The 1σ uncertainty of each parameter is derived from the Gaussian fit to its probability distribution by setting other parameter to its best-fit value (e.g., Zhang et al 2012Zhang et al , 2014Kang et al 2014). …”

Section: Modeling the Seds Of Pks 1424+240mentioning

confidence: 99%

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On the origin of the soft photons of the high-synchrotron-peaked blazar PKS 1424+240

Kang

Zheng

et al. 2016

Mon. Not. R. Astron. Soc.

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PKS 1424+240 is a distant very high energy gamma-ray BL Lac object with redshift z = 0.601. It was found that pure synchrotron self-Compton (SSC) process normally need extreme input parameters (e.g., very low magnetic field intensity and extraordinarily large Doppler factor) to explain its multi-wavelength spectral energy distributions (SEDs). To avoid the extreme model parameters, different models have been proposed (e.g., two-zone SSC model or lepto-hadronic model). In this work, we employ the traditional one-zone leptonic model after including a weak external Compton component to re-explore the simultaneous multi-wavelength SEDs of PKS 1424+240 in both high (2009) and low (2013) states. We find that the input parameters of magnetic field and Doppler factor are roughly consistent with those of other BL Lacs if a weak external photon field from either broad line region (BLR) or the dust torus. However, the required energy density of seed photons from BLR or torus is about 3 orders of magnitude less than that constrained in luminous quasars (e.g., flat-spectrum radio quasars, FSRQs). This result suggests that the BLR/torus in BL Lacs is much weaker than that of luminous FSRQs (but not fully disappear), and the inverse-Compton of external photons from BLR/torus may still play a role even in high synchrotron peaked blazars.

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“…Tavecchio et al 2010;Zhang et al 2014) . For the two VERITAS observables, the systematic uncertainty has been taken into account and summed in quadrature with the statistical error.…”

Section: Flwo 48"mentioning

confidence: 99%

VERITAS detection of gamma-ray flaring activity from the BL Lac object 1ES1727+502 during bright moonlight observations

Cerruti¹

2016

Proceedings of the 34th International Cosmic Ray Conference — PoS(ICRC2015)

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During moonlit nights, observations with ground-based Cherenkov telescopes at very high energies (VHE, E > 100 GeV) are constrained since the photomultiplier tubes (PMTs) in the telescope camera are extremely sensitive to the background moonlight. Observations with the VERITAS telescopes in the standard configuration are performed only with a moon illumination less than 35% of full moon. Since 2012, the VERITAS collaboration has implemented a new observing mode under bright moonlight, by either reducing the voltage applied to the PMTs (reduced-high-voltage configuration, RHV), or by utilizing UV-transparent filters. While these operating modes result in lower sensitivity and increased energy thresholds, the extension of the available observing time is useful for monitoring variable sources such as blazars and sources requiring spectral measurements at the highest energies. In this paper we report the detection of γ-ray flaring activity from the BL Lac object 1ES 1727+502 during RHV observations. This detection represents the first evidence of VHE variability from this blazar. The integral flux is (1.1 ± 0.2) × 10 −11 cm −2 s −1 above 250 GeV, which is about five times higher than the low-flux state. The detection triggered additional VERITAS observations during standard dark-time. Multiwavelength observations with the FLWO 48" telescope, and the Swift and Fermi satellites are presented and used to produce the first spectral energy distribution (SED) of this object during γ-ray flaring activity. The SED is then fitted with a standard synchrotron-self-Compton model, placing constraints on the properties of the emitting region and of the acceleration mechanism at the origin of the relativistic particle population in the jet.

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RELATIVISTIC JET PROPERTIES OF GeV-TeV BLAZARS AND POSSIBLE IMPLICATIONS FOR THE JET FORMATION, COMPOSITION, AND CAVITY KINEMATICS

Cited by 73 publications

References 98 publications

THEγ-RAY DETECTED NARROW-LINE SEYFERT 1 GALAXY 1H 0323+342:SWIFTMONITORING ANDSUZAKUSPECTROSCOPY

THEγ-RAY DETECTED NARROW-LINE SEYFERT 1 GALAXY 1H 0323+342:SWIFTMONITORING ANDSUZAKUSPECTROSCOPY

On the origin of the soft photons of the high-synchrotron-peaked blazar PKS 1424+240

VERITAS detection of gamma-ray flaring activity from the BL Lac object 1ES1727+502 during bright moonlight observations

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