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Intrinsic structure and kinematics of the sub-parsec scale jet of M87

Y. Y. Kovalev MPIfR-Bonn; ASC Lebedev. May 22, 2007. Alaska. Intrinsic structure and kinematics of the sub-parsec scale jet of M87. Collaborators. May 22, 2007. Alaska. Y. Y. Kovalev (MPIfR-Bonn, ASC Lebedev) K. I. Kellermann (NRAO) M. L. Lister (Purdue University)

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Intrinsic structure and kinematics of the sub-parsec scale jet of M87

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  1. Y. Y. Kovalev MPIfR-Bonn; ASC Lebedev May 22, 2007 Alaska Intrinsic structure and kinematics of the sub-parsec scale jet of M87

  2. Collaborators May 22, 2007 Alaska • Y. Y. Kovalev (MPIfR-Bonn, ASC Lebedev) • K. I. Kellermann (NRAO) • M. L. Lister (Purdue University) • D. C. Homan (Denison University) • A. P. Lobanov(MPIfR-Bonn) • 2 cm VLBA / MOJAVE group Arecibo Observatory Library Colloquium

  3. Sub-parsec-scale jet in M87 at 15 GHz May 22, 2007 Alaska

  4. 3 mas long “Counter-jet” May 22, 2007 Alaska • 15 GHz • Ly et al. (2007)

  5. Counter-jet tests: is it real or an imaging artifact? May 22, 2007 Alaska • Deep VLBA+VLA M87 image • A model without a counter-jet was used to produce • the fake uv dataset 1: no counter-jet is detected in the image • A model with a counter-jet was used to produce • the fake uv dataset 2: the counter-jet detected in the image

  6. M87 CP results: -0.5% May 22, 2007 Alaska • Homan & Lister (2006)

  7. Negative speed of a counter-jet feature May 22, 2007 Alaska

  8. Intrinsic jet structure May 22, 2007 Alaska

  9. Intrinsic structure of the counter jet May 22, 2007 Alaska

  10. 15 GHz VLBA M87 movie May 22, 2007 Alaska

  11. Kinematics May 22, 2007 Alaska • Fastest jet speed: 0.03c • Counter-jet: • -0.01c

  12. Discussion May 22, 2007 Alaska • Large scale jet opening angle: 6 degrees. • Linear polarization data corrected for FRM from Zavala & Taylor (2002) suggest highly ordered longitudinal magnetic field. • We argue that the “counter-jet” is the counter-jet. • Jet / Counter-jet brightness ratio is measured to be 14. • Assuming viewing angle 20-40 degrees, this brightness ratio suggests that the bulk flow is (0.5-0.6)c. • If the edge brightened jet structure is due to a velocity gradient and the jet is described by a two component model with a fast spine and a slow sheath, this could explain the detected variable TeV emission from M87 (Aharonian et al. 2006) following the spine-sheath model of Ghisellini et al. (2005).

  13. Thank you June 10, 2005 April 11, 2005 NASA GSFC Arecibo Observatory Library Colloquium

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