General Physical Properties of Gamma-Ray-emitting Radio Galaxies

Chen, Yongyun; Gu, Qiusheng; Fan, J. H.; Yu, Xiaoling; Ding, Nan; Xiong, Dingrong; Guo, Xiaotong

doi:10.3847/1538-4365/acc57f

Cited by 3 publications

(2 citation statements)

References 77 publications

(110 reference statements)

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“…One-zone SSC modeling of the core SEDs of FRI/FRII-type RGs in comparison appears to require numerical values for the model parameters similar to our results from modeling FR0s, except for the Doppler factor D. While D ∼ 1.3-2.8 for modeling FR0s, SSC modeling of the core emission from FRI/ FRII requires D ∼ 3-50 (e.g., Chen et al 2023;Acciari et al 2020; EHT MWL Science Working Group et al 2021 (using a two-component SSC model); Archer et al 2020;Ahnen et al 2017;Aleksić et al 2014). This indicates a higher bulk speed of FRI/FRII as compared to FR0.…”

Section: Discussionmentioning

confidence: 53%

Characterizing the γ-Ray Emission from FR0 Radio Galaxies

Khatiya,

Boughelilba,

Karwin

et al. 2024

ApJ

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FR0 galaxies constitute the most abundant jet population in the local Universe. With their compact jet structure, they are broadband photon emitters and have been proposed as multimessenger sources. Recently, these sources have been detected for the first time in γ rays. Using a revised FR0 catalog, we confirm that the FR0 population as a whole are γ-ray emitters, and we also identify two significant sources. For the first time, we find a correlation between the 5 GHz core radio luminosity and γ-ray luminosity in the 1–800 GeV band, having a 4.8σ statistical significance. This is clear evidence that the jet emission mechanism is similar in nature for FR0s and the well-studied canonical FR (FRI and FRII) radio galaxies. Furthermore, we perform broadband spectral energy distribution modeling for the significantly detected sources as well as the subthreshold source population using a one-zone synchrotron self-Compton model. Within the maximum jet power budget, our modeling shows that the detected γ rays from the jet can be explained as inverse Compton photons. To explain the multiwavelength observations for these galaxies, the modeling results stipulate a low bulk Lorentz factor and a jet composition far from equipartition, with the particle energy density dominating over the magnetic field energy density.

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Section: Discussionmentioning

confidence: 53%

Characterizing the γ-Ray Emission from FR0 Radio Galaxies

Khatiya,

Boughelilba,

Karwin

et al. 2024

ApJ

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“…Arsioli & Chang 2018;Chen et al 2023). In this work, our regression analysis implies that the EC process likely dominates the IC component of FSRQs.…”

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confidence: 71%

Jet Mechanism and γ-Ray-emitting Region for Fermi Flat-spectrum Radio Quasars with Broad-line Emissions

Zhang,

Chen,

et al. 2024

ApJS

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Blazars are a subject of intense debate, specifically regarding their jet launch and emission mechanisms, and the origins of their γ-ray radiation. To explore these issues, we have built a comprehensive sample of flat-spectrum radio quasars (FSRQs), with well-characterized spectral energy distribution. This study aims to elucidate the dominant jet launch mechanism and the main processes behind the inverse Compton (IC) component. Additionally, we seek to pinpoint the location of the γ-ray dissipation region relative to the central black hole, denoted as R γ . Our approach involves a detailed analysis of broad-line region (BLR) emission, from which we derive robust estimates of the black hole masses using two distinct virial techniques. This enables us to constrain the jet power across a wide array of FSRQs. Our findings lead to several significant conclusions: (i) The correlation of jet power with black hole mass allows us to test the Blandford–Znajek, Blandford–Payne, and hybrid mechanisms. We find that the hybrid mechanism is most effective in explaining the jet power observed in the majority of FSRQs; (ii) The IC component of the γ-rays in FSRQs is predominantly due to the external Compton process. (iii) Through simulations, we determine the minimum and maximum values of R γ (the γ-ray dissipation region) and conclude it is located outside the BLR. This conclusion is derived from the variability timescale analysis.

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Jet power extracted from ADAFs and the application to Fermi BL Lacertae objects

Chen(陈永云),

Gu(顾秋生),

Fan(樊军辉)

et al. 2023

Monthly Notices of the Royal Astronomical Society

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We calculate the jet power of the Blandford–Znajek (BZ) model and the hybrid model based on the self-similar solution of advection-dominated accretion flows (ADAFs). We study the formation mechanism of the jets of BL Lacertae (BL Lacs) with known redshifts detected by the Fermi satellite after 10 yr of data (4FGL-DR2). The kinetic power of the jets of Fermi BL Lacs is estimated through radio luminosity. The main results are as follows. (1) We find that the jet kinetic power of about 72 per cent intermediate peak frequency BL Lacs (IBL) and 94 per cent high-frequency peak BL Lacs (HBL) can be explained by the hybrid jet model based on ADAFs surrounding Kerr black holes. However, the jet kinetic power of about 74 per cent low-frequency peak BL Lacs (LBL) cannot be explained by the BZ jet model or the hybrid model. (2) The LBL has a higher accretion rate than IBL and HBL. About 14 per cent IBL and 62 per cent HBL have pure optically thin ADAFs. However, 7 per cent LBL may have a hybrid structure consisting of an standard thin disc (SS) plus optically thin ADAFs. (3) After excluding the redshift dependence, there is a weak correlation between the jet kinetic power and the accretion disc luminosity for Fermi BL Lacs. (4) There is a significant correlation between inverse-Compton luminosity and synchrotron luminosity for Fermi BL Lacs. The slope of the relation between inverse-Compton luminosity and synchrotron luminosity for Fermi BL Lacs is consistent with the synchrotron self-Compton (SSC) process. The result may suggest that the high-energy components of Fermi BL Lacs are dominated by the SSC process.

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General Physical Properties of Gamma-Ray-emitting Radio Galaxies

Cited by 3 publications

References 77 publications

Characterizing the γ-Ray Emission from FR0 Radio Galaxies

Characterizing the γ-Ray Emission from FR0 Radio Galaxies

Jet Mechanism and γ-Ray-emitting Region for Fermi Flat-spectrum Radio Quasars with Broad-line Emissions

Jet power extracted from ADAFs and the application to Fermi BL Lacertae objects

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