Intrinsic structure and kinematics of the sub-parsec scale jet of M87 Y. Y. Kovalev MPIfR-Bonn; ASC...
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Transcript of Intrinsic structure and kinematics of the sub-parsec scale jet of M87 Y. Y. Kovalev MPIfR-Bonn; ASC...
![Page 1: Intrinsic structure and kinematics of the sub-parsec scale jet of M87 Y. Y. Kovalev MPIfR-Bonn; ASC Lebedev Alaska May 22, 2007.](https://reader036.fdocuments.us/reader036/viewer/2022062517/56649ef45503460f94c07250/html5/thumbnails/1.jpg)
Intrinsic structure and kinematics of the sub-parsec scale jet of M87
Y. Y. KovalevMPIfR-Bonn; ASC Lebedev
AlaskaMay 22, 2007
![Page 2: Intrinsic structure and kinematics of the sub-parsec scale jet of M87 Y. Y. Kovalev MPIfR-Bonn; ASC Lebedev Alaska May 22, 2007.](https://reader036.fdocuments.us/reader036/viewer/2022062517/56649ef45503460f94c07250/html5/thumbnails/2.jpg)
• 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
![Page 3: Intrinsic structure and kinematics of the sub-parsec scale jet of M87 Y. Y. Kovalev MPIfR-Bonn; ASC Lebedev Alaska May 22, 2007.](https://reader036.fdocuments.us/reader036/viewer/2022062517/56649ef45503460f94c07250/html5/thumbnails/3.jpg)
Sub-parsec-scale jet in M87 at 15 GHz
AlaskaMay 22, 2007
![Page 4: Intrinsic structure and kinematics of the sub-parsec scale jet of M87 Y. Y. Kovalev MPIfR-Bonn; ASC Lebedev Alaska May 22, 2007.](https://reader036.fdocuments.us/reader036/viewer/2022062517/56649ef45503460f94c07250/html5/thumbnails/4.jpg)
3 mas long “Counter-jet”
AlaskaMay 22, 2007
15 GHz
Ly et al. (2007)
![Page 5: Intrinsic structure and kinematics of the sub-parsec scale jet of M87 Y. Y. Kovalev MPIfR-Bonn; ASC Lebedev Alaska May 22, 2007.](https://reader036.fdocuments.us/reader036/viewer/2022062517/56649ef45503460f94c07250/html5/thumbnails/5.jpg)
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
![Page 6: Intrinsic structure and kinematics of the sub-parsec scale jet of M87 Y. Y. Kovalev MPIfR-Bonn; ASC Lebedev Alaska May 22, 2007.](https://reader036.fdocuments.us/reader036/viewer/2022062517/56649ef45503460f94c07250/html5/thumbnails/6.jpg)
M87 CP results: -0.5%
AlaskaMay 22, 2007
Homan & Lister (2006)
![Page 7: Intrinsic structure and kinematics of the sub-parsec scale jet of M87 Y. Y. Kovalev MPIfR-Bonn; ASC Lebedev Alaska May 22, 2007.](https://reader036.fdocuments.us/reader036/viewer/2022062517/56649ef45503460f94c07250/html5/thumbnails/7.jpg)
Negative speed of a counter-jet feature
AlaskaMay 22, 2007
![Page 8: Intrinsic structure and kinematics of the sub-parsec scale jet of M87 Y. Y. Kovalev MPIfR-Bonn; ASC Lebedev Alaska May 22, 2007.](https://reader036.fdocuments.us/reader036/viewer/2022062517/56649ef45503460f94c07250/html5/thumbnails/8.jpg)
Intrinsic jet structure
AlaskaMay 22, 2007
![Page 9: Intrinsic structure and kinematics of the sub-parsec scale jet of M87 Y. Y. Kovalev MPIfR-Bonn; ASC Lebedev Alaska May 22, 2007.](https://reader036.fdocuments.us/reader036/viewer/2022062517/56649ef45503460f94c07250/html5/thumbnails/9.jpg)
Intrinsic structure of the counter jet
AlaskaMay 22, 2007
![Page 10: Intrinsic structure and kinematics of the sub-parsec scale jet of M87 Y. Y. Kovalev MPIfR-Bonn; ASC Lebedev Alaska May 22, 2007.](https://reader036.fdocuments.us/reader036/viewer/2022062517/56649ef45503460f94c07250/html5/thumbnails/10.jpg)
15 GHz VLBA M87 movie
AlaskaMay 22, 2007
![Page 11: Intrinsic structure and kinematics of the sub-parsec scale jet of M87 Y. Y. Kovalev MPIfR-Bonn; ASC Lebedev Alaska May 22, 2007.](https://reader036.fdocuments.us/reader036/viewer/2022062517/56649ef45503460f94c07250/html5/thumbnails/11.jpg)
Kinematics
AlaskaMay 22, 2007
Fastest jet speed: 0.03c
Counter-jet:-0.01c
![Page 12: Intrinsic structure and kinematics of the sub-parsec scale jet of M87 Y. Y. Kovalev MPIfR-Bonn; ASC Lebedev Alaska May 22, 2007.](https://reader036.fdocuments.us/reader036/viewer/2022062517/56649ef45503460f94c07250/html5/thumbnails/12.jpg)
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).
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Arecibo Observatory Library ColloquiumApril 11, 2005 NASA GSFCJune 10, 2005
Thank you