The structure of the jet in 3C 15 from multi-band polarimetry

Abstract

We investigate the structure of the kpc-scale jet in the nearby (z = 0.073) radio galaxy 3C 15, using new optical Hubble Space Telescope (HST) ACS/F606W polarimetry together with archival multi-band HST imaging, Chandra X-ray data and 8.4 GHz VLA radio polarimetry. The new data confirm that synchrotron radiation dominates in the optical. With matched beams, the jet is generally narrower in the optical than in the radio, suggesting a stratified flow. We examine a simple two-component model comprising a highly relativistic spine and lower-velocity sheath. This configuration is broadly consistent with polarization angle differences seen in the optical and radio data. The base of the jet is relatively brighter in the ultraviolet and X-ray than at lower energies, and the radio and optical polarization angles vary significantly as the jet brightens downstream. Further out, the X-ray intensity rises again and the apparent magnetic field becomes simpler, indicating a strong shock. Modelling the synchrotron spectrum of this brightest X-ray knot provides an estimate of its minimum internal pressure, and a comparison with the thermal pressure from X-ray emitting gas shows that the knot is overpressured and likely to be a temporary, expanding feature.

arXiv comment12 pages, 7 figures, accepted by MNRAS

References in corpus (13)

• Particle acceleration by ultra-relativistic shocks: theory and simulations
• Polarization of prompt GRB emission: evidence for electromagnetically-dominated outflow
• Optical and Radio Polarimetry of the M87 Jet at 0.2" Resolution
• A Chandra observation of the X-ray environment and jet of 3C31
• FR II radio galaxies with z<0.3 -- I. Properties of jets, cores and hot spots
• Chandra observations of the X-ray jet in 3C66B
• Chandra finds X-ray jets are common in low-power radio galaxies
• Magnetic field strengths in the hot spots of 3C33 and 3C111
• X-ray synchrotron emission from the oblique shock in the jet of the powerful radio galaxy 3C 346
• Chandra Discovery of an X-ray Jet and Lobes in 3C 15
• Multiwavelength evidence of the physical processes in radio jets
• Optical Polarimetry of the Jets of Nearby Radio Galaxies: I. The Data
• The X-ray emission of 3C 346 and its environment

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