Astronomy and Astrophysics – Astrophysics
Scientific paper
2000-02-24
MPE Report 271, October 1999, page 111
Astronomy and Astrophysics
Astrophysics
4 pages Latex with 4 embedded figures, plus one color version (postscript) which was used on the cover of the conference proce
Scientific paper
ROSAT High Resolution Imager (HRI) data from eight observations have been co-added to obtain an effective exposure of 230 ksec. We have identified a number of features and regions with excess X-ray brightness over that from a circularly symmetric model of the well known hot gas component. A prominent `spur' extends 4' from the vicinity of knot A towards the south-west. The brightness to the south and east of this spur is significantly higher than that to the north and west. Excess brightness is also found to the East of the nucleus, with a local maximum centered on the eastern radio lobe 3' from the core. There are two well known relationships between radio and x-ray emission for radio galaxies in clusters: coincidence of emissions because the X-rays come from inverse Compton or synchrotron processes; and anti-coincidence caused by exclusion of hot gas from radio entities. We present a radio/X-ray comparison to determine if either of these relationships can be isolated in M87. The greatest obstacle we face is the unknown projection which affects both bands.
Biretta John A.
Harris Daniel E.
Junor William
Owen Frazer
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