VLBI observations of TXS 0506+056 show a spine-sheath jet with aligned inner and perpendicular outer EVPAs plus a new superluminal component near the IceCube neutrino detection.
The Spectral Energy Distribution of Fermi bright blazars
8 Pith papers cite this work. Polarity classification is still indexing.
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abstract
(Abridged) We have conducted a detailed investigation of the broad-band spectral properties of the \gamma-ray selected blazars of the Fermi LAT Bright AGN Sample (LBAS). By combining our accurately estimated Fermi gamma-ray spectra with Swift, radio, infra-red, optical and other hard X-ray/gamma-ray data, collected within three months of the LBAS data taking period, we were able to assemble high-quality and quasi-simultaneous Spectral Energy Distributions (SED) for 48 LBAS blazars.The SED of these gamma-ray sources is similar to that of blazars discovered at other wavelengths, clearly showing, in the usual Log $\nu $ - Log $\nu$ F$_\nu$ representation, the typical broad-band spectral signatures normally attributed to a combination of low-energy synchrotron radiation followed by inverse Compton emission of one or more components. We have used these SEDs to characterize the peak intensity of both the low and the high-energy components. The results have been used to derive empirical relationships that estimate the position of the two peaks from the broad-band colors (i.e. the radio to optical and optical to X-ray spectral slopes) and from the gamma-ray spectral index. Our data show that the synchrotron peak frequency $\nu_p^S$ is positioned between 10$^{12.5}$ and 10$^{14.5}$ Hz in broad-lined FSRQs and between $10^{13}$ and $10^{17}$ Hz in featureless BL Lacertae objects.We find that the gamma-ray spectral slope is strongly correlated with the synchrotron peak energy and with the X-ray spectral index, as expected at first order in synchrotron - inverse Compton scenarios. However, simple homogeneous, one-zone, Synchrotron Self Compton (SSC) models cannot explain most of our SEDs, especially in the case of FSRQs and low energy peaked (LBL) BL Lacs. (...)
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UNVERDICTED 8representative citing papers
An empirical kernel for Bethe-Heitler pair spectra is introduced and applied to argue that synchrotron emission from these pairs can explain gamma-ray emission in low- and intermediate-peaked blazars for jet regions of size ~10^15 cm and B = 5-500 G.
A leptonic jet model with stochastic turbulent acceleration predicts hard and soft X-ray Fourier lags plus a transition regime in HBLs, with STA and nonlinear SSC cooling amplifying lags and explaining trends with flare duration.
Multi-wavelength monitoring of a gamma-ray flare in 1H 0323+342 reveals sub-hour variability, jet-corona transition, and ~10^46 erg/s jet power via external Compton modeling of disk and BLR photons.
A sample of 69 HBLs yields intrinsic radio-X-ray correlation L_R,int ∝ L_X,int^0.68 and fundamental plane log L_R,int = 0.57 log L_X,int + 0.33 log M_BH + 12.65, consistent with synchrotron cooling model for X-ray emission.
Multi-instrument observations reveal broad overlap in X-ray photon indices across blazar subclasses with intra-source spectral evolution supporting transition-like behavior.
New IXPE X-ray polarimetry and optical monitoring of PG 1553+113 reveal variable polarization and a large EVPA swing, supporting jet models with related but non-co-spatial X-ray and optical emission regions.
EHSP blazars exhibit hard intrinsic GeV-TeV spectra with high-energy peaks near TeV energies after EBL correction, based on combined Fermi-LAT and ground-based telescope data.
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Parsec-scale polarimetry and kinematics of a spine-sheath jet in the neutrino-blazar TXS 0506+056
VLBI observations of TXS 0506+056 show a spine-sheath jet with aligned inner and perpendicular outer EVPAs plus a new superluminal component near the IceCube neutrino detection.
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A closer look at the electromagnetic signatures of Bethe-Heitler pair production process in blazars
An empirical kernel for Bethe-Heitler pair spectra is introduced and applied to argue that synchrotron emission from these pairs can explain gamma-ray emission in low- and intermediate-peaked blazars for jet regions of size ~10^15 cm and B = 5-500 G.
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X-ray Fourier lag-frequency spectra modulated by stochastic turbulent acceleration in the jets of high-frequency-peaked BL Lac
A leptonic jet model with stochastic turbulent acceleration predicts hard and soft X-ray Fourier lags plus a transition regime in HBLs, with STA and nonlinear SSC cooling amplifying lags and explaining trends with flare duration.
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A Rare Gamma-ray Flaring episode of the Narrow-Line Seyfert 1 Galaxy 1H 0323+342
Multi-wavelength monitoring of a gamma-ray flare in 1H 0323+342 reveals sub-hour variability, jet-corona transition, and ~10^46 erg/s jet power via external Compton modeling of disk and BLR photons.
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The Fundamental Planes of Black Hole Activity for High-Synchrotron-Peaked BL Lacertae Objects
A sample of 69 HBLs yields intrinsic radio-X-ray correlation L_R,int ∝ L_X,int^0.68 and fundamental plane log L_R,int = 0.57 log L_X,int + 0.33 log M_BH + 12.65, consistent with synchrotron cooling model for X-ray emission.
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Spectral-Regime Overlap and Transition-like Behavior in the Blazar Population from Multi-Instrument X-ray and TeV Observations
Multi-instrument observations reveal broad overlap in X-ray photon indices across blazar subclasses with intra-source spectral evolution supporting transition-like behavior.
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Tracking down the broadband polarimetric properties of PG 1553+113
New IXPE X-ray polarimetry and optical monitoring of PG 1553+113 reveal variable polarization and a large EVPA swing, supporting jet models with related but non-co-spatial X-ray and optical emission regions.
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Intrinsic GeV-TeV gamma-ray emission from EHSP blazars
EHSP blazars exhibit hard intrinsic GeV-TeV spectra with high-energy peaks near TeV energies after EBL correction, based on combined Fermi-LAT and ground-based telescope data.