intrinsic structure and kinematics of the sub-parsec scale jet of m87 y. y. kovalev mpifr-bonn; asc...
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Intrinsic structure and kinematics of the sub-parsec scale jet of M87
Y. Y. KovalevMPIfR-Bonn; ASC Lebedev
AlaskaMay 22, 2007
• 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
Collaborators
AlaskaMay 22, 2007
Sub-parsec-scale jet in M87 at 15 GHz
AlaskaMay 22, 2007
3 mas long “Counter-jet”
AlaskaMay 22, 2007
15 GHz
Ly et al. (2007)
Counter-jet tests: is it real or an imaging artifact?
AlaskaMay 22, 2007
Deep VLBA+VLA M87 image
A model without a counter-jet was used to producethe fake uv dataset 1: no counter-jet is detected in the image
A model with a counter-jet was used to producethe fake uv dataset 2: the counter-jet detected in the image
M87 CP results: -0.5%
AlaskaMay 22, 2007
Homan & Lister (2006)
Negative speed of a counter-jet feature
AlaskaMay 22, 2007
Intrinsic jet structure
AlaskaMay 22, 2007
Intrinsic structure of the counter jet
AlaskaMay 22, 2007
15 GHz VLBA M87 movie
AlaskaMay 22, 2007
Kinematics
AlaskaMay 22, 2007
Fastest jet speed: 0.03c
Counter-jet:-0.01c
Discussion
AlaskaMay 22, 2007
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).
Arecibo Observatory Library ColloquiumApril 11, 2005 NASA GSFCJune 10, 2005
Thank you