dc.contributor.author | Floyd, David | en_US |
dc.contributor.author | Perlman, Eric | en_US |
dc.contributor.author | Leahy, J. Patrick | en_US |
dc.contributor.author | Beswick, Rob | en_US |
dc.contributor.author | Jackson, Neal | en_US |
dc.contributor.author | Sparks, William | en_US |
dc.contributor.author | Axon, David | en_US |
dc.contributor.author | O’Dea, Christopher | en_US |
dc.date.accessioned | 2006-05-09T19:27:03Z | en_US |
dc.date.available | 2006-05-09T19:27:03Z | en_US |
dc.date.issued | 2006-03-01 | en_US |
dc.identifier.citation | Astrophysical Journal 639N1 (2006) 23-36 | en_US |
dc.identifier.issn | 1538-4357 | en_US |
dc.identifier.uri | http://hdl.handle.net/1850/1770 | en_US |
dc.description.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. From our NIR images, the core of the galaxy is clearly identifiable with the main feature in the western extension of the radio “jet” image, although no unresolved AGN
component is identifiable even at K-band, consistent with an FRII-like nucleus obscured
by an optically thick torus. The galaxy appears to have a single nucleus, with any multiple nuclei falling within the central <∼ 100 pc. (Refer to PDF file for exact formulas). | en_US |
dc.description.sponsorship | Based on observations with the NASA/ESA Hubble Space Telescope, obtained at the Space
Telescope Science Institute, which is operated by the Association of Universities for Research in
Astronomy, Inc. (AURA), under NASA contract NAS5-26555. MERLIN is a national facility
operated by the University of Manchester on behalf of PPARC in the UK. This research has made use of the NASA/IPAC Extragalactic Database (NED) which is operated by the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration. We would like to thank Alison Peck and Greg Taylor for their contributions to this project. We also thank Paul Rayner for help with the MERLIN 5 GHz imaging, and acknowledge Dean Hines for his polarize software. R. J. B. would like to acknowledge financial support from the European Commission’s I3 Programme “RADIONET” under contract 505818. | en_US |
dc.format.extent | 828356 bytes | en_US |
dc.format.mimetype | application/pdf | en_US |
dc.language.iso | en_US | en_US |
dc.publisher | Astrophysical Journal | en_US |
dc.relation.ispartofseries | vol. 639 | en_US |
dc.relation.ispartofseries | no. 1 | en_US |
dc.relation.ispartofseries | part 1 | en_US |
dc.relation.ispartofseries | pps. 23-36 | en_US |
dc.subject | Galaxies-active | en_US |
dc.subject | Galaxies-individual (3C293) | en_US |
dc.subject | Galaxies-jets | en_US |
dc.subject | Galaxies-polarization | en_US |
dc.title | The jet and circumnuclear environment of 3C 293 | en_US |
dc.type | Article | en_US |
dc.identifier.url | http://dx.doi.org/10.1086/499295 | |