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Astron. Astrophys. 318, 383-389 (1997)

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ROSAT-HRI observations of the jet in M 87

M. Neumann 1, K. Meisenheimer 1, H.-J. Röser 1 and H.H. Fink 2

1 Max Planck-Institut für Astronomie, Königstuhl 17, D-69117 Heidelberg, Germany
2 Max Planck Institut für Extraterrestrische Physik, Giessenbachstraße 1, D-85740 Garching, Germany

Received 28 May 1996 / Accepted 22 July 1996


We present ROSAT-HRI observations of the central region of M 87. By comparison with radio and optical data we investigate whether the X-ray emission of the jet can be explained by the high frequency tail of the radio to optical synchrotron spectrum. We indeed find that knot D and the optically brightest knot A are likely to emit synchrotron X-rays. Although the synchrotron model of the X-ray emission is compatible with the observations at all wavelengths a thermal origin of the X-rays cannot completely ruled out.

Key words: galaxies: M 87; jets – X-ray: galaxies

Send offprint requests to: K. Meisenheimer

© European Southern Observatory (ESO) 1997

Online publication: July 8, 1998