What question did this study set out to answer?

To re-evaluate the canonical Fanaroff-Riley luminosity-morphology relationship in extended radio-loud active galactic nuclei using a comprehensive low-frequency survey.

July 9, 2019Monthly Notices of the Royal Astronomical SocietyOpen Access

Revisiting the Fanaroff–Riley dichotomy and radio-galaxy morphology with the LOFAR Two-Metre Sky Survey (LoTSS)

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Authors

BMB. MingoUniversity of Hertfordshire JCJ. H. CrostonThe Open University MHM. J. HardcastleUniversity of Hertfordshire

Discussion

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Implication

Observational survey uncovers low-luminosity FRII sources in radio-loud active galactic nuclei, indicating that host environment strongly governs jet structure.

Key Points

To re-evaluate the canonical Fanaroff-Riley luminosity-morphology relationship in extended radio-loud active galactic nuclei using a comprehensive low-frequency survey.
Analyzed morphological properties and host-galaxy characteristics of 5,805 extended radio-loud active galactic nuclei (AGN) from the LOFAR Two-Metre Sky Survey (LoTSS).
Classified source structures into edge-brightened (FRII), centre-brightened (FRI), bent-tailed, and hybrid or restarting morphologies.
Cross-matched bent-tailed sources with SDSS galaxy clusters at redshift z < 0.4 to evaluate environmental association fractions.
Radio luminosity fails to reliably predict FRI versus FRII morphology, revealing a substantial population of low-luminosity FRIIs extending three orders of magnitude below the traditional Fanaroff-Riley break luminosity.
Host galaxies of low-luminosity FRIIs are systematically fainter than those of traditional high-luminosity FRIIs and luminosity-matched FRIs, supporting an environmental paradigm where lower-mass hosts allow low-power jets to stay undisrupted.
Identified 459 bent-tailed sources, which exhibit a significantly higher SDSS cluster association fraction at z < 0.4 compared to the general radio-galaxy population.

Cite This Study

Mingo et al. (2019) studied this question.

synapsesocial.com/papers/69dedf0b92a5e9426ae93a5d https://doi.org/10.1093/mnras/stz1901

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Implication

Observational survey uncovers low-luminosity FRII sources in radio-loud active galactic nuclei, indicating that host environment strongly governs jet structure.

Revisiting the Fanaroff–Riley dichotomy and radio-galaxy morphology with the LOFAR Two-Metre Sky Survey (LoTSS)

Discussion

Member takes

Implication

Key Points

Cite This Study

Revisiting the Fanaroff–Riley dichotomy and radio-galaxy morphology with the LOFAR Two-Metre Sky Survey (LoTSS)

Discussion

Member takes

Implication

Key Points

Cite This Study

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