Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-09-28
Astronomy and Astrophysics
Astrophysics
Accepted for publication in MNRAS. Figure 2 is best viewed in colour
Scientific paper
10.1111/j.1365-2966.2007.12483.x
We present Very Large Array images of a "Double-Double Radio Galaxy", a class of objects in which two pairs of lobes are aligned either side of the nucleus. In this object, B0925+420, we discover a third pair of lobes, close to the core and again in alignment with the other lobes. This first-known "Triple-Double" object strongly increases the likelihood that these lobes represent mutiple episodes of jet activity, as opposed to knots in an underlying jet. We model the lobes in terms of their dynamical evolution. We find that the inner pair of lobes is consistent with the outer pair having been displaced buoyantly by the ambient medium. The middle pair of lobes is more problematic - to the extent where an alternative model interpreting the middle and inner "lobes" as additional bow shocks within the outer lobes may be more appropriate - and we discuss the implications of this on our understanding of the density of the ambient medium.
Brocksopp Catherine
de Bruyn Ger A.
Kaiser Christian R.
Schoenmakers Arno P.
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