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***