MOJAVE (Monitoring Of Jets in Active galactic nuclei with VLBA Experiments) is a long-term program to monitor radio brightness and polarization variations in jets associated with active galaxies visible in the northern sky. Approximately 1/3 of these were observed from 1994-2002 as part of the VLBA 2 cm Survey. These jets are powered by the accretion of material onto billion-solar-mass black holes located in the nuclei of active galaxies. Their rapid brightness variations and apparent superluminal motions indicate that they contain highly energetic plasma moving nearly directly at us at speeds approaching that of light.  Our observations are made with the world's highest resolution telescope: the Very Long Baseline Array (VLBA) at wavelengths of 7 mm, 1.3 cm, and 2 cm, which enables us to make full polarization images with an angular resolution better than 1 milliarcsecond (the apparent separation of your car's headlights, as seen by an astronaut on the Moon). We are using these data to better understand the complex evolution and magnetic field structures of these jets on light-year scales, close to where they originate in the active nucleus, and how this activity is correlated with gamma-ray emission detected by NASA's Fermi observatory.

For astronomers: All calibrated (u,v) visibility and FITS data for the MOJAVE and Boston U programs are available via html links on the source pages. If you are interested in Stokes Q,U,V (linear and circular polarization) FITS images, please contact us.

If you use these data in a publication, we ask that you please contact us so we can add a link to the list of external MOJAVE publications, and ask that you cite (Lister et al., 2018, ApJS, 234, 12) and include the following acknowledgment: "This research has made use of data from the MOJAVE database that is maintained by the MOJAVE team (Lister et al. 2018)"

New Individual AGN Jet Paper Published: The MOJAVE team has published a detailed study of stationary features in the jet of BL Lac (Arshakian et al. 2020).

Press release:   https://mipt.ru/english/news/cosmic_quasars_embrace_1970s_fashion_trend  :  Team member Yuri Y. Kovalev (Lebedev Physical Institute, and Moscow Institute of Physics and Technology) has led a study using epoch-stacked image data from the MOJAVE survey (available on the individual AGN source pages). We have found that 10 AGN jets at redshift < 0.07 show a transition from a parabolic to conical shape. This suggests that this geometry transition may be a common effect in AGN jets. The break is found to occur at 10^{^5}-10^{^6} gravitational radii from the active nucleus.

MOJAVE program approved through August 2021: We have received priority 'A' status on the VLBA starting in Aug. 2019 to conduct monthly simultaneous 15+24+43 GHz observations at 4 Gbps of 25 blazars, and regularly observe an additional 69 AGNs at 15 GHz (2 Gbps). This is the first large scale high resolution multi-epoch study of Faraday rotation measure and spectral gradients in AGN jets.

Kinematics and Parent Population Analysis Paper: We have analyzed the pc-scale jet kinematics of 409 bright radio-loud AGNs based on 15 GHz VLBA data obtained between 1994 August 31 and 2016 December 26. 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., and show that they are consistent with powerful FR II class radio galaxies. The manuscript was published in ApJ in March 2019.

New MOJAVE Flux Density-Limited Sample (1.5JyQC):  Using data from the VLBA, UMRAO, RATAN-600, and OVRO-40m telescopes, we have constructed a new complete '1.5 Jy Quarter Century' sample consisting of all 232 non-lensed AGN north of declination -30 degrees known to have exceeded 1.5 Jy in VLBA flux density at 15 GHz between 1994.0-2019.0.

VLBA L Band Data:  In 2010, D. Gabuzda and collaborators at Univ. College Cork observed the original MOJAVE AGN sample at 4 frequencies in L Band with the VLBA to investigate jet polarization and Faraday rotation properties. We have added the preliminary u,v visibility data and images from this program to the individual MOJAVE source pages in our data archive.