TeV BL Lac objects at the dawn of the<i>Fermi</i>era

Tavecchio, F.; Ghisellini, G.; Ghirlanda, G.; Foschini, L.; Maraschi, L.

doi:10.1111/j.1365-2966.2009.15784.x

Cited by 266 publications

(332 citation statements)

References 75 publications

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“…Tavecchio et al (2010) obtained the physical parameters associated to 45 BL Lacs applying the one-zone synchrotron-self Compton (SSC) model (e.g. Tavecchio et al 1998) to non-simultaneous SED, whose IC peak is tracked by either Fermi-LAT (33 sources) or TeV (12 sources) data.…”

Section: An Illustrative Case: Mkn 421mentioning

confidence: 99%

“…The magnetic and the electron energy densities derived using the parameter values provided in Tavecchio et al (2010) are reported and compared in Fig. 3.…”

Section: The Full Samplementioning

confidence: 99%

“…In Tavecchio et al (2010) the SSC model was applied to all the BL Lac detected in the γ-ray band (by Cherenkov telescopes or by Fermi-LAT in the first three months of operation) and the parameters for all sources were derived. Here we exploit this large sample to derive the magnetic and the particle energy density of BL Lac objects ( §2).…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

On the magnetization of BL Lac jets

Tavecchio¹,

Ghisellini²

2015

Mon. Not. R. Astron. Soc.

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133

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Section: An Illustrative Case: Mkn 421mentioning

confidence: 99%

“…The magnetic and the electron energy densities derived using the parameter values provided in Tavecchio et al (2010) are reported and compared in Fig. 3.…”

Section: The Full Samplementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

On the magnetization of BL Lac jets

Tavecchio¹,

Ghisellini²

2015

Mon. Not. R. Astron. Soc.

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133

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“…The seed photons are most likely the synchrotron photons internal to the jet. Such "synchrotron selfCompton" (SSC) models, developed by many authors (for early examples see, e.g., Jones et al 1974;Ghisellini et al 1985;Marscher & Gear 1985), have been successfully invoked to describe the full SED of HBL objects (e.g., Ulrich et al 1997;Fossati et al 2008;Tavecchio et al 2010).…”

Section: Introductionmentioning

confidence: 99%

MULTIWAVELENGTH STUDY OF QUIESCENT STATES OF Mrk 421 WITH UNPRECEDENTED HARD X-RAY COVERAGE PROVIDED BY NuSTAR IN 2013

Baloković¹,

Paneque²,

Madejski³

et al. 2016

ApJ

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116

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We present coordinated multiwavelength observations of the bright, nearby BL Lacertae object Mrk 421 taken in 2013 January-March, involving GASP-WEBT, Swift, NuSTAR, Fermi-LAT, MAGIC, VERITAS, and other collaborations and instruments, providing data from radio to very high energy(VHE) γ-ray bands. NuSTAR yielded previously unattainable sensitivity in the 3-79keV range, revealing that the spectrum softens when the source is dimmer until the X-ray spectral shape saturates into a steep 3 G » power law, with no evidence for an exponential cutoff or additional hard components up to ∼80keV. For the first time, we observed both the synchrotron and the inverse-Compton peaks of the spectral energy distribution (SED) simultaneously shifted to frequencies below the typical quiescent state by an order of magnitude. The fractional variability as a function of photon energy shows a double-bump structure that relates to the two bumps of the broadband SED. In each bump, the variability increases with energy, which, in the framework of the synchrotron self-Compton model, implies that the electrons with higher energies are more variable. The measured multi band variability, the significant X-ray-to-VHE correlation down to some of the lowest fluxes ever observed in both bands, the lack of correlation between optical/UV and X-ray flux, the low degree of polarization and its significant (random) variations, the short estimated electron cooling time, and the significantly longer variability timescale observed in the NuSTAR light curves point toward in situ electron acceleration and suggest that there are multiple compact regions contributing to the broadband emission of Mrk 421 during low-activity states.

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“…2 as well as the model from Tavecchio et al (2010). The electron distribution is described by a broken power law of index S 1 = 2 below an energy break γ b = 1.4 × 10 4 and S 2 = 4.9 above.…”

Section: Spectral Energy Distributionmentioning

confidence: 90%

The challenging SED of AP Librae

2011

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Abstract. Matching the broad-band emission of active galaxies with the predictions of theoretical models can be used to derive constraints on the properties of the emitting region and to probe the physical processes involved. AP Librae is the third low frequency peaked BL Lac (LBL) detected at very high energy (VHE, E>100GeV) by an Atmospheric Cherenkov Telescope; most VHE BL Lacs (34 out of 39) belong to the high-frequency and intermediate-frequency BL Lac classes (HBL and IBL). LBL objects tend to have a higher luminosity with lower peak frequencies than HBLs or IBLs. The characterization of their time-averaged spectral energy distribution is challenging for emission models such as synchrotron self-Compton (SSC) models.

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TeV BL Lac objects at the dawn of theFermiera

Cited by 266 publications

References 75 publications

On the magnetization of BL Lac jets

On the magnetization of BL Lac jets

MULTIWAVELENGTH STUDY OF QUIESCENT STATES OF Mrk 421 WITH UNPRECEDENTED HARD X-RAY COVERAGE PROVIDED BY NuSTAR IN 2013

The challenging SED of AP Librae

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