X-ray Detection of the Inner Jet in the Radio Galaxy M84


Smithsonian Astrophysical Observatory,
60 Garden Street, Cambridge, MA 02138

A. Finoguenov

Max-Planck-Institut für extraterrestrische Physik, Giessenbachstrasse, 85748 Garching, Germany


National Radio Astronomy Observatory
520 Edgemont Road, Charlottesville, VA 22903-2475.


Department of Physics, University of Bristol,
Tyndall Avenue, Bristol BS8 1TL, U.K.


University of Oxford, Department of Astrophysics,
Denys Wilkinson Building, Keble Road, Oxford OX1 3RH, U.K.

Astrophysical Journal, in press


During the course of an investigation of the interaction of the radio galaxy M84 and its ambient cluster gas, we found excess X-ray emission aligned with the northern radio jet. The emission extends from the X-ray core of the host galaxy as a weak bridge and then brightens to a local peak coincident with the first detectable radio knot at ˜2.5" from the core. The second radio knot at 3.3" is brighter in both radio and X-rays. The X-ray jet terminates 3.9" from the core. Although all the evidence suggests that Doppler favoritism augments the emission of the northern jet, it is unlikely that the excess X-ray emission is produced by inverse Compton emission. We find many similarities between the M84 X-ray jet and recent jet detections from Chandra data of low luminosity radio galaxies. For most of these current detections synchrotron emission is the favored explanation for the observed X-rays.

2002 July 22