8th HEAD Meeting, 8-11 September, 2004
Session 9 Jets and Blazars
Oral, Wednesday, September 8, 2004, 11:00am-12:30pm

## [9.02] A Chandra Survey of Quasar Jets

H.L. Marshall, J.M. Gelbord (MIT CSR), D.A. Schwartz (SAO), J.E.J. Lovell (CSIRO), D.W. Murphy (JPL), D.M. Worrall, M. Birkinshaw (U. Bristol), E.S. Perlman (UMBC), D.L. Jauncey (CSIRO), S. Jester (Fermilab)

We present results from {\em Chandra} X-ray imaging and spectroscopy of a flux-limited sample of flat spectrum radio-emitting quasars with jet-like extended structure. Over 60% of the quasar jets are detected in short ACIS-S exposures, obtained in two {\em Chandra} observing cycles. The quasars without X-ray jets are not significantly different from those with detected jets except that the extended radio emission is generally fainter. New radio maps are combined with the X-ray images in order to elucidate the relation between radio and X-ray emission in spatially resolved structures. We find a variety of morphologies, including long straight jets and bends up to 90 degrees. All X-ray jets are one-sided although the radio images used for source selection often show lobes opposite the X-ray jets. The FR II X-ray jets can all be interpreted as inverse Compton scattering of cosmic microwave background photons by electrons in large-scale relativistic jets although deeper observations are required to test this interpretation in detail. Applying this interpretation to the jets as a population, we find that the jets would be aligned to within 30 degrees of the line of sight generally, assuming that the bulk Lorentz factor of the jets is 10. One of the knots detected in one of our quasar jet images is particularly intersting because it is significantly brighter optically than other knots, relative to the radio or X-ray fluxes.

HLM was supported under NASA contract SAO SV1-61010 for the Chandra X-Ray Center (CXC). JMG was supported under Chandra grant GO2-3151A to MIT from the CXC. DAS was partially supported by Chandra grant G02-3151C to SAO from the CXC.