The Long, Bright Extended X-ray Jet of OJ287
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Transcript of The Long, Bright Extended X-ray Jet of OJ287
The Long, Bright Extended X-ray Jet of OJ287
Alan Marscher & Svetlana JorstadBoston University
Research Web Page: www.bu.edu/blazars
Chandra Image of OJ287 (50 ks exposure)
Comparison of X-ray (Chandra) and Radio (VLA) Jet
X-ray emission follows radio but extends beyond lowest VLA contour Readout streak
1 = 4.52 kpcLength of X-ray jet ~ 81 kpc in projection (before confusion with readout streak)
Color: 0.2-6 keV
Contours: 1.4 GHz
Compact (VLBA) vs. Extended Jet
Kpc-scale jet consistent with continuation of pc-scale jet
pc scales: superluminal motion as high as 18c (Jorstad et al. 2005) = 16.5±4.0, viewing angle = 3.2º±0.9º, = 19±6
Deprojected length of X-ray jet = 1.5±0.5 Mpc
Radio/X-ray spectral index ~ 0.7 (we will have opt/ & IR fluxes)
VLBA
Luminosity of OJ287 Jet
OJ287: length of X-ray jet > 1 Mpc
L < 2x1024 watts/Hz at 1.4 GHz for region at end of jet (upper limit: no beaming)*
Upper range of FR 1 luminosity
Extended (apparent) X-ray luminosity: 3x1042 erg/s
* If there is a slower spine that decelerates with distance in OJ287, its 1.4 GHz luminosity is less than ~ 1024 watts/Hz
2007+777 (z=0.342) (Sambruna et al. 2008) - similar, but not as high
PKS 0521-365 (z=0.0554) (Birkinshaw et al. 2002) - short jet
3C 371 (z=0.051) & PKS 2201+041 (z=0.027) (Sambruna et al. 2007) - few arcsecs long, resolved transverse to axis:
Comparison with Extended Jets of other BL Lac Objects
Contours: radio (VLA)
Color: X-ray (Chandra)
3C 3712201+041
Long, Fast FR 1 Jets
Long (> 1 Mpc) jets with high : high- tail of population Rare in more local FR 1 radio galaxies Higher jets have smaller opening angles (Jorstad et al. 2005)
High low entrainment, greater penetration into IGM without deceleration ***independent of whether FR 1 or FR 2 luminosity***