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To appear in Ap.J. The jet and circumnuclear environment of 3C 293 12

By David J. E. Floyd, Eric Perlman, J. Patrick Leahy, R. J. Beswick, Neal J. Jackson, William B. Sparks, David J. Axon and Christopher P. O’dea

Abstract

We present the new HST near-infrared polarimetry, broad and narrow-band imaging, and MERLIN 4.5GHz Multi-Frequency Synthesis radio imaging of 3C 293, a unique radio galaxy whose host is an obvious merger remnant, in an exceptionally under-dense region of space. We have discovered near-infrared, optical, and ultra-violet synchrotron emission from the jet. In the optical, the jet is mostly obscured by a dust lane, but three knots are clear in our HST NICMOS images at 1.6 and 2.0 µm, clearly aligning with features in the radio. The outer jet knot is highly polarized ( ≈ 15%) at 2 µm, confirming the synchrotron emission mechanism. The radio-IR spectral index steepens significantly with distance from the nucleus, as in 3C 273 and in contrast to M 87. The inner knot is visible (with hindsight) on the WFPC2 and STIS images obtained for the earlier 3CR HST snapshot surveys. There is no [Fe ii] emission seen associated with the jet, constraining the role of shock-induced ionisation by the jet. Overall there is a strong implication that the NIR jet emission is indeed synchrotron. – 2 – From our NIR images, the core of the galaxy is clearly identifiable with the mai

Year: 2005
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