Projekteja vuodessa
Abstrakti
We present results from a parsec-scale jet kinematics study of 409 bright radio-loud active galactic nuclei (AGNs) based on 15 GHz Very Long Baseline Array (VLBA) data obtained between 1994 August 31 and 2016 December 26 as part of the 2 cm VLBA survey and Monitoring Of Jets in Active galactic nuclei with VLBA Experiments (MOJAVE) programs. We tracked 1744 individual bright features in 382 jets over at least 5 epochs. A majority (59%) of the best-sampled jet features showed evidence of accelerated motion at the >3σ level. Although most features within a jet typically have speeds within ∼40% of a characteristic median value, we identified 55 features in 42 jets that had unusually slow pattern speeds, nearly all of which lie within 4 pc (100 pc deprojected) of the core feature. Our results, combined with other speeds from the literature, indicate a strong correlation between apparent jet speed and synchrotron peak frequency, with the highest jet speeds being found only in low-peaked AGNs. Using Monte Carlo simulations, we find best-fit parent population parameters for a complete sample of 174 quasars above 1.5 Jy at 15 GHz. Acceptable fits are found with a jet population that has a simple unbeamed power-law luminosity function incorporating pure luminosity evolution and a power-law Lorentz factor distribution ranging from 1.25 to 50 with slope -1.4 ± 0.2. The parent jets of the brightest radio quasars have a space density of 261 ± 19 Gpc -3 and unbeamed 15 GHz luminosities above ∼10 24.5 W Hz -1 , consistent with FR II class radio galaxies.
Alkuperäiskieli | Englanti |
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Artikkeli | 43 |
Sivumäärä | 19 |
Julkaisu | The Astrophysical Journal |
Vuosikerta | 874 |
Numero | 1 |
DOI - pysyväislinkit | |
Tila | Julkaistu - 20 maalisk. 2019 |
OKM-julkaisutyyppi | A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä |
Sormenjälki
Sukella tutkimusaiheisiin 'MOJAVE. XVII. Jet Kinematics and Parent Population Properties of Relativistically Beamed Radio-loud Blazars'. Ne muodostavat yhdessä ainutlaatuisen sormenjäljen.Projektit
- 3 Päättynyt
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Mustien aukkojen suihkut ja niiden fysiikka
Savolainen, T. (Vastuullinen tutkija) & Chamani Velasco, W. (Projektin jäsen)
01/09/2017 → 31/08/2019
Projekti: Academy of Finland: Other research funding
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Mustien aukkojen suihkut ja niiden fysiikka
Savolainen, T. (Vastuullinen tutkija)
01/09/2014 → 31/08/2019
Projekti: Academy of Finland: Other research funding
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Mustien aukkojen suihkut ja niiden fysiikka
Chamani Velasco, W. (Projektin jäsen), Savolainen, T. (Vastuullinen tutkija) & Kiehlmann, S. (Projektin jäsen)
01/09/2014 → 31/12/2015
Projekti: Academy of Finland: Other research funding
Laitteet
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Metsähovin radiotutkimusasema
Tammi, J. (Manager)
Sähkötekniikan korkeakouluLaitteistot/tilat: Facility