The relativistic jet dichotomy and the end of the blazar sequence
| Autor: | Karthik Reddy, Mary Keenan, Omar J French, Markos Georganopoulos, Eileen T. Meyer |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
High Energy Astrophysical Phenomena (astro-ph.HE)
Physics Solar mass Jet (fluid) Accretion (meteorology) 010308 nuclear & particles physics Radio galaxy Astrophysics::High Energy Astrophysical Phenomena FOS: Physical sciences Spectral density Astronomy and Astrophysics Quasar Astrophysics::Cosmology and Extragalactic Astrophysics Astrophysics Astrophysics - Astrophysics of Galaxies 01 natural sciences Luminosity Space and Planetary Science Astrophysics of Galaxies (astro-ph.GA) 0103 physical sciences High Energy Physics::Experiment Astrophysics - High Energy Astrophysical Phenomena Blazar 010303 astronomy & astrophysics |
| Zdroj: | Monthly Notices of the Royal Astronomical Society. 505:4726-4745 |
| ISSN: | 1365-2966 0035-8711 |
| Popis: | Our understanding of the unification of jetted AGN has evolved greatly as jet samples have increased in size. Here, based on the largest-ever sample of over 2000 well-sampled jet spectral energy distributions, we examine the synchrotron peak frequency -- peak luminosity plane, and find little evidence for the anti-correlation known as the blazar sequence. Instead, we find strong evidence for a dichotomy in jets, between those associated with efficient or `quasar-mode' accretion (strong/type II jets) and those associated with inefficient accretion (weak/type I jets). Type II jets include those hosted by high-excitation radio galaxies, flat-spectrum radio quasars (FSRQ), and most low-frequency-peaked BL Lac objects. Type I jets include those hosted by low-excitation radio galaxies and blazars with synchrotron peak frequency above 10^15 Hz (nearly all BL Lac objects). We have derived estimates of the total jet power for over 1000 of our sources from low-frequency radio observations, and find that the jet dichotomy does not correspond to a division in jet power. Rather, type II jets are produced at all observed jet powers, down to the lowest levels in our sample, while type I jets range from very low to moderately high jet powers, with a clear upper bound at ~10^43 erg/s The range of jet power in each class matches exactly what is expected for efficient (i.e., a few to 100% Eddington) or inefficient ( Accepted for publication in MNRAS (19 April 2021) |
| Databáze: | OpenAIRE |
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