A Deep Chandra Observation of the PKS 1055+201 Jets, Lobes, and Hotspots

We have previously noted the quasar PKS 1055+201, (= 4C 20.24), as an example where we separately detect the X-ray emission from the narrow radio jet, and also from extended plasma along the entire length of the jet and counter-jet. We have recently obtained a deep Chandra image, increasing the exposure by a factor of eight. We can now study the spectral index in spatially resolved regions. Surprisingly, we do not detect obvious spectral gradients in the jet or in the extended emission. The spectrum of the jet is steeper than the surrounding regions by 0.25 in the energy index. We see that the extended emission is somewhat irregular, not a uniform surface brightness as previously assumed. To the north, we detect X-ray emission throughout the region where the 1460-MHz emission makes two apparent right angle bends. Additional Xray emission is detected quasi-symmetric about the quasar, and we tentatively interpret this as emission from a cluster of galaxies. We also report on our 324 MHz observations which detect the southern radio lobe. Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138 Department of Physics, University of Bristol, Tyndall Avenue, Bristol BS8 1TL, UK CSIRO Australia Telescope National Facility, PO Box 76, Epping NSW 1710, Australia School of Mathematics and Physics, Private Bag 21, University of Tasmania, Hobart Tas 7001,