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

2. Collaborators 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
Alaska
May 22, 2007
Arecibo Observatory Library Colloquium

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

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

5. Counter-jet tests: is it real or an imaging artifact?
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
Alaska
May 22, 2007

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

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

8. Intrinsic jet structure
Alaska
May 22, 2007

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

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

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

12. Discussion 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 degrees, this brightness ratio suggests that the bulk flow is ( )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).
Alaska
May 22, 2007

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