Astronomy and Astrophysics – Astrophysics – High Energy Astrophysical Phenomena
Scientific paper
2009-12-15
Astronomy and Astrophysics
Astrophysics
High Energy Astrophysical Phenomena
65 pages in pre-print form incl. 9 figures (multi-page), 7 tables, and notes. Accepted by ApJ
Scientific paper
We present new and archival Chandra X-ray Observatory observations of X-shaped radio galaxies within z < 0.1 alongside a comparison sample of normal double-lobed FR I and II radio galaxies. By fitting elliptical distributions to the observed diffuse hot X-ray emitting atmospheres, we find that the ellipticity and the position angle of the hot gas follows that of the stellar light distribution for radio galaxy hosts in general. Moreover, compared to the control sample, we find a strong tendency for X-shaped morphology to be associated with wings directed along the minor axis of the hot gas distribution. Taken at face value, this result favors the hydrodynamic backflow models for the formation of X-shaped radio galaxies which naturally explain the geometry; the merger-induced rapid reorientation models make no obvious prediction about orientation.
Cheung Chi C.
Hodges-Kluck Edmund
Miller Michael Coleman
Reynolds Christopher S.
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