The Quasar CTD 135 Is Not a Compact Symmetric Object

Frey, S.; Gabányi, K. É.; An, Tao

doi:10.3390/sym14020321

Cited by 3 publications

(2 citation statements)

References 37 publications

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“…Whereas, R CE is ∼1 for CTD 135 and 1.42 for PKS 1413+135. It seems to be coincident with that PKS 1413+135 and CTD 135 are reclassified as blazars rather than CSOs (Readhead et al 2021;Frey et al 2022). Different from CTD 135 and PKS 1413+135, PKS 1718-649, NGC 3894, and TXS 0128+554 definitely satisfy the CSO criteria asked by Kiehlmann et al (2023).…”

Section: Introductionmentioning

confidence: 64%

Lobe-dominated γ-Ray Emission of Compact Symmetric Objects

Gan,

Zhang,

Yang

et al. 2024

Res. Astron. Astrophys.

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The $\gamma$-ray emitting compact symmetric objects (CSOs) PKS 1718--649, NGC 3894, and TXS 0128+554 are lobe-dominated in the radio emission. In order to investigate their $\gamma$-ray radiation properties, we analyze the $\sim$14-yr Fermi/LAT observation data of the three CSOs. They all show the low luminosity ($10^{41}-10^{43}$ erg s$^{-1}$) and no significant variability in the $\gamma$-ray band. Their $\gamma$-ray average spectra can be well fitted by a power-law function. These properties of $\gamma$-rays are clearly different from the $\gamma$-ray emitting CSOs CTD 135 and PKS 1413+135, for which the $\gamma$-rays are produced by a restarted aligned jet. In the $L_{\gamma}-\Gamma_{\gamma}$ plane, the three CSOs are also located at the region occupied by radio galaxies (RGs) while CTD 135 and PKS 1413+135 display the similar feature to blazars. Together with the similar radio emission property to $\gamma$-ray emitting RGs Cen A and Fornax A, we speculate that the $\gamma$-rays of the three CSOs stem from their extended mini-lobes. The broadband spectral energy distributions of the three CSOs can be well explained by the two-zone leptonic model, where their $\gamma$-rays are produced by the inverse Compton process of the relativistic electrons in extended region. By extrapolating the observed Fermi/LAT spectra to the very high energy band, we find that TXS 0128+554 among the three CSOs may be detected by the Cherenkov Telescope Array in future.

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Section: Introductionmentioning

confidence: 64%

Lobe-dominated γ-Ray Emission of Compact Symmetric Objects

Gan,

Zhang,

Yang

et al. 2024

Res. Astron. Astrophys.

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“…This AGN sample consists of 5 CSOs (Migliori et al 2016;Lister et al 2020;Principe et al 2020;Gan et al 2021Gan et al , 2022Gan et al , 2024Principe et al 2021), 7 CSSs (Zhang et al 2020;Gu et al 2022), together with 18 radio galaxies and numerous blazars (from Abdollahi et al 2022); blazars includes flat-spectrum radio quasars (FSRQs) and BL Lacertae objects (BL Lacs). According to the criteria of "bona fide" CSOs (Kiehlmann et al 2024), CTD 135 and PKS 1413+135 should be classified as blazar-types (see also Frey et al 2022;Peirson et al 2022). In the L γ -Γ γ plane, they are located at the region occupied by blazars, which is distinctly different from the other three "bona fide" CSOs, coinciding with core-jet dominated γ-rays (Gan et al 2021(Gan et al , 2022.…”

Section: Discussionmentioning

confidence: 99%

Study of γ-Ray Emission from a Compact Radio Galaxy with the Fermi Large Area Telescope

Wu,

Yu,

Gan

et al. 2024

ApJ

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The radio galaxy PKS 1007+142 is classified as a compact steep-spectrum source (CSS) and belongs to the class of young active galactic nuclei (AGNs). In this paper, we investigate the γ-ray emission from this CSS by conducting a comprehensive analysis of the 15 yr Fermi Large Area Telescope (Fermi-LAT) observation data. The Fermi-LAT latest Source Catalog, 4FGL-DR4, includes an unassociated γ-ray source, 4FGL J1010.0+1416, located at 0.°24 away from the radio position of PKS 1007+142. Using the 15 yr Fermi-LAT observation data, we reestimate the best-fit position of the γ-ray source and find that PKS 1007+142 is in close proximity to the γ-ray source and falls within its 68% error circle. Therefore, we conclude that PKS 1007+142 is the most plausible counterpart to the unassociated LAT source with detection test statistics ∼ 43.4 (∼6.6σ). PKS 1007+142 exhibits a steep power-law spectrum in the 0.1–300 GeV band, with a photon spectral index (Γ γ ) of 2.86 ± 0.17. The average flux in the considered time interval is (2.14 ± 0.34) × 10−12 erg cm−2 s−1. Comparing PKS 1007+142 with other γ-ray emitting AGNs in both the L γ –Γ γ and L γ –L 1.4 GHz planes, it shows a softer γ-ray spectrum and lower luminosity compared to other γ-ray emitting CSSs. Furthermore, the possible origins of γ-ray in PKS 1007+142 are also discussed.

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Special Issue on Astronomy and Symmetry

Frey

2022

Symmetry

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The Quasar CTD 135 Is Not a Compact Symmetric Object

Cited by 3 publications

References 37 publications

Lobe-dominated γ-Ray Emission of Compact Symmetric Objects

Lobe-dominated γ-Ray Emission of Compact Symmetric Objects

Study of γ-Ray Emission from a Compact Radio Galaxy with the Fermi Large Area Telescope

Special Issue on Astronomy and Symmetry

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