The Subarcsecond Radio Structure in NGC 1068. I. Observations and Results

Details The Subarcsecond Radio Structure in NGC 1068. I. Observations and Results The Subarcsecond Radio Structure in NGC 1068. I. Observations and Results

Feb 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996apj...458..136g&link_type=abstract

Astrophysical Journal v.458, p.136

Astronomy and Astrophysics

Astronomy

86

Galaxies: Individual Ngc Number: Ngc 1068, Galaxies: Jets, Galaxies: Seyfert, Galaxies: Structure, Radio Continuum: Galaxies

Scientific paper

We present the results of new and archival multifrequency MERLIN and VLA observations of the hybrid starburst/Seyfert galaxy NGC 1068, with emphasis on the subarcsecond radio "triple" and its associated synchrotron-emitting jet. These results include measurements of the radio continuum spectrum and trajectory of the radio jet, the sizes and minimum energy properties of the compact features, and linear polarization at 22 GHz.
Between ν = 1.4 and 22 GHz the northeastern and central components (NE and C) have steep spectra: α = -1.04±0.05 and -0.67±004 respectively (Sν ∝ να). The spectrum of the subarcsecond jet flattens locally at components NE and C, implying either compression or reacceleration. The southern component (S) has a very flat spectrum, α = -0.08±0.05 between 1.4 and 22 GHz. The brightness temperatures of the compact features making up component S (subcomponents S1 and S2) are low, Tb 3 x 105 K at 5 GHz.
The radio jet bends abruptly at component C from an initial P.A. ˜12° to P.A. ˜30°. Contrary to the findings of Ulvestad, Neff & Wilson (1987), we find no evidence for a gradual, C-shaped bending of the radio jet. The minimum pressures of the compact features are comparable to those of the surrounding narrow-line region.
We report ˜4-5 σ detections of linear polarization in the directions of components NE and S. The polarization is detected at 22 GHz with 0"25 resolution, but not in the more sensitive 15 GHz data with 0".13 resolution. This result indicates that there may be substantial Faraday depolarization toward or within the subarcsecond radio structure.

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