On estimators of the jet bolometric luminosity of Fermi 2LAC blazars

Wang, Zerui; Xue, Rui; Du, L. M.; Xie, Zhao-Hua; Xiong, Dingrong; Yi, Ting-Feng; Xu, Yunbing; Liu, Wenguang

doi:10.1007/s10509-017-3142-8

Cited by 3 publications

(1 citation statement)

References 38 publications

(41 reference statements)

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“…For the case of blazars, the gamma-ray luminosity can be a better indicator of the integrated bolometric luminosity than radio luminosity (Fossati et al 1998;Wang et al 2017). It is thus possible to explore this relationship between the two variables for our sample of blazars, using Fermi-LAT data accumulated over 10 years.…”

Section: Blazar Sequencementioning

confidence: 99%

Study of Blazar activity in 10 year Fermi-LAT data and implications for TeV neutrino expectations

Sacahui,

Penacchioni,

Marinelli

et al. 2020

Preprint

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RESUMENLos blazares son las fuentes de rayos gamma más activas. Presentan periodos esporádicos de actividad, con duraciones de horas a meses. Presentamos un análisis de una muestra de fuentes brillantes detectadas por Fermi-LAT (100 MeV-300 GeV) durante una década. Usando curvas de luz con episodios de 2 semanas estimamos el ciclo de actividad (DC): la fracciónde tiempo que la fuente pasa en el estado activo. Los objetos presentan diferentes valores del DC, con promedio de ∼27% cuando se considera y no se considera el fondo de luz difusa. Adicionalmente estudiamos la tendencia conocida como "secuencia de blazares". Este análisis restringe una posible contraparte de neutrinos con energías de sub-PeV durante los estados estacionarios, dejando la posibilidad de explicar las observaciones de IceCube durante periodos de fase activa.

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Section: Blazar Sequencementioning

confidence: 99%

Study of Blazar activity in 10 year Fermi-LAT data and implications for TeV neutrino expectations

Sacahui,

Penacchioni,

Marinelli

et al. 2020

Preprint

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Analyzing the gamma-ray activity of neutrino emitter candidates: comparing TXS 0506+056 with other blazars

Marinelli

Sacahui²,

Sharma

et al. 2021

Monthly Notices of the Royal Astronomical Society

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On 22nd of September 2017 the IceCube collaboration sent an alert for an EHE (Extreme High Energy) event, corresponding to the reconstruction of a muonic neutrino (IC-170922A) with energy ∼290 TeV. A multi-wavelength follow-up campaign associated this neutrino event with a gamma-ray flaring state of the BL Lac TXS 0506+056 located at z=0.3365. From the same position of the sky a muonic neutrino excess is observed in a time window of 110 days around 13th of December 2014. These observations together suggest TXS 0506+056 as a possible neutrino emitter. We report here a long term gamma-ray monitoring of this source and we compare it with other blazars spatially correlated with astrophysical muonic neutrino events observed by IceCube. We characterize the most significant gamma-ray flares of the blazars in the sample and introduce the blazar duty cycle as an important parameter to be considered when assessing a possible neutrino counterpart. For the selected blazars we show the expected neutrino flux variability with different time binning assuming the gamma-rays observed by Fermi-LAT as a product of a leptohadronic emission scenario. The neutrino expectations from the blazar sample are then compared with the IceCube discovery flux searching for the optimal time bin in a multi-messenger context. This analysis indicates that the detection of a single flare represents a challenge for a single cubic kilometer detector, underlining the importance of increasing the size of current neutrino telescopes and obtaining a good monitoring of the entire sky through a global neutrino network.

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Understanding the phenomenological and intrinsic blazar sequence using a simple scaling model

Wan,

Xue,

Wang

et al. 2024

Monthly Notices of the Royal Astronomical Society

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The blazar sequence, including negative correlations between radiative luminosity Lrad and synchrotron peak frequency ν, and between Compton dominance Y and ν, is widely adopted as a phenomenological description of spectral energy distributions (SEDs) of blazars, although its underlying cause is hotly debated. In particular, these correlations turn positive after correcting Doppler boosting effect. In this work, we revisit the phenomenological and intrinsic blazar sequence with three samples, which are historical sample (SEDs are built with historical data), quasi-simultaneous sample (SEDs are built with quasi-simultaneous data) and Doppler factor corrected sample (a sample with available Doppler factors), selected from literature. We find that phenomenological blazar sequence holds in historical sample, but does not exist in quasi-simultaneous sample, and intrinsic correlation between Lrad and ν becomes positive in Doppler factor corrected sample. We also analyze if the blazar sequence still exists in subclasses of blazars, i.e., flat-spectrum radio quasars and BL Lacertae objects, with different values of Y. To interpret these correlations, we apply a simple scaling model, in which physical parameters of the dissipation region are connected to the location of the dissipation region. We find that the model generated results are highly sensitive to the chosen ranges and distributions of physical parameters. Therefore, we suggest that even though the simple scaling model can reproduce the blazar sequence under specific conditions that have been fine-tuned, such results may not have universal applicability. Further consideration of a more realistic emission model is expected.

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On estimators of the jet bolometric luminosity of Fermi 2LAC blazars

Cited by 3 publications

References 38 publications

Study of Blazar activity in 10 year Fermi-LAT data and implications for TeV neutrino expectations

Study of Blazar activity in 10 year Fermi-LAT data and implications for TeV neutrino expectations

Analyzing the gamma-ray activity of neutrino emitter candidates: comparing TXS 0506+056 with other blazars

Understanding the phenomenological and intrinsic blazar sequence using a simple scaling model

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