Astrophys. J., 874, 43-43 (2019/March-3)
MOJAVE. XVII. Jet kinematics and parent population properties of relativistically beamed radio-loud blazars.
LISTER M.L., HOMAN D.C., HOVATTA T., KELLERMANN K.I., KIEHLMANN S., KOVALEV Y.Y., MAX-MOERBECK W., PUSHKAREV A.B., READHEAD A.C.S., ROS E. and SAVOLAINEN T.
Abstract (from CDS):
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 ∼1024.5 W Hz–1, consistent with FR II class radio galaxies.
© 2019. The American Astronomical Society. All rights reserved.
BL Lacertae objects: general - galaxies: active - galaxies: jets - galaxies: Seyfert - quasars: general - radio continuum: galaxies
VizieR on-line data:
<Available at CDS (J/ApJ/874/43): table1.dat table2.dat table3.dat table4.dat table5.dat>
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