The Twin--Jet System in NGC 1052: VLBI-Scrutiny of the Obscuring Torus

Details The Twin--Jet System in NGC 1052: VLBI-Scrutiny of the Obscuring Torus The Twin--Jet System in NGC 1052: VLBI-Scrutiny of the Obscuring Torus

2004-07-14

arxiv.org/abs/astro-ph/0407283v1

Astron.Astrophys. 426 (2004) 481-493

Astronomy and Astrophysics

Astrophysics

14 pages, 11 figures, needs aa.cls, accepted for publication in Astronomy & Astrophysics, note that the resolution of figure 2

Scientific paper

10.1051/0004-6361:20041051

NGC 1052 offers the possibility to study the obscuring torus around a supermassive black hole, predicted by the standard model of active galactic nuclei, over a wide range of wavelengths from the radio to the X-ray regime. We present a detailed VLBI study of the parsec-scale structure of the ``twin-jet'' system in NGC 1052 in both total and polarized intensity and at multiple frequencies. We report the detection of linearly polarized emission from the base of the eastern jet at 5 GHz. While the radio spectrum in this region might be still consistent with synchrotron self absorption, the highly inverted spectrum of the western jet base represents a clear sign of pronounced free-free absorption in a circumnuclear torus. We observe an abrupt change of the brightness temperature gradient at a distance of $\sim 0.2$ pc to 0.3 pc from the central engine. This might provide an observational signature of the edge of the central torus, where the transition from an external pressure-dominated jet regime to a more or less freely expanding jet takes place. We determine the absorbing column density towards the western jet core to be $\sim 2.2 \times 10^{22}$ cm$^{-2}$ in good agreement with the values derived from various X-ray observations. This suggests that the nuclear X-ray emission and the jet emission imaged by VLBI originate on the same scales.

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