NRAO 150

Minimum credit line: Image courtesy of NRAO/AUI and Ivan Agudo, Instituto de Astrofísica de Andalucía (CSIC), Granada, Spain(for details, see Image Use Policy).

About this Image

Sequence of images of NRAO 150 obtained with the VLBA at 43 GHz (7mm) at a resolution of 0.16 milliarcseconds from 1997 to 2007. NRAO 150 is a compact and bright object at radio and millimeter wavelengths that was identified in 2005 with a quasar at redshift z = 1.52 through a near-IR spectral observation. The figure shows the time evolution of the parsec-scale millimeter-wave source, which displays (after 2000) the typical jet-like structure observed in quasars. Such jets, composed of plasma at high relativistic energies and speeds, point in directions that make very small angles to our line of sight. For these reasons we have a distorted view of jets in quasars, which can display *apparent* speeds higher than the speed of light, as projected on the plane of the sky. These images have for the first time allowed study of the kinematics of the NRAO 150 jet on the smallest accessible scales and to compute the first estimates of the basic physical properties of such a jet. The kinematic study shows a pronounced projected counter-clockwise jet position angle swing at an angular rate of up to ~11 deg./yr within the inner ~30 parsecs of the jet. This phenomenon is associated with an extremely bent (i.e. non-ballistic) trajectory of superluminal motion in the jet, which makes NRAO 150 a source of great interest. These results, together with independent computations of the magnetic field intensity in the jet of NRAO 150, suggest that the magnetic field could play an important role in the dynamics of this jet.

Investigator(s):  I. Agudo, U. Bach, T. P. Krichbaum, A. P. Marscher, I. Gonidakis, P. J. Diamond, M. Perucho, W. Alef, D. A. Graham, A. Witzel, J. A. Zensus, M. Bremer, J. A. Acosta-Pulido, R. Barrena

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Technical Data

    Telescope VLBA 
    Date of Observation 2007-02-26 
    Type of Observation Continuum Observations 
    Band Q 
    Wavelength 7 mm 
    Frequency 45 GHz 
    Center of Image RA: 03:59:29.75, Dec: 50:57:50.16 (J2000)  
    Field of View 0.0019 x 0.0019 arcsec  
    Technical Caption The figure shows a selection of 18 of the 34 NRAO 150 images obtained from 1997 to 2007 with the VLBA at 43 GHz under different monitoring programs (BA071, BA082, BB152, BM230, BD080, BD079, BD069, BD046). All the images have been convolved with the same circular beam of 0.16 mas. The common intensity scale ranges from 0.025 Jy/beam to 4.128 Jy/beam. Information about each individual image and observing setup can be found in the Journal article.  

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